Dorchester Minerals LP
Annual Report 2006

Plain-text annual report

DORCHESTER MINERALS LP FORM 10-K (Annual Report) Filed 03/06/07 for the Period Ending 12/31/06 Address Telephone CIK 3838 OAK LAWN SUITE 300 DALLAS, TX 75219-4541 2145590300 0001172358 Symbol DMLP SIC Code 1311 - Crude Petroleum and Natural Gas Industry Oil & Gas Operations Sector Fiscal Year Energy 12/31 http://www.edgar-online.com © Copyright 2011, EDGAR Online, Inc. All Rights Reserved. Distribution and use of this document restricted under EDGAR Online, Inc. Terms of Use. Table of Contents Index to Financial Statements UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-K Commission File Number: 000-50175 DORCHESTER MINERALS, L.P. (Exact name of registrant as specified in its charter) 3838 Oak Lawn Avenue, Suite 300 Dallas, Texas 75219 (Address of principal executive offices) (Zip Code) (214) 559-0300 (Registrant’s telephone number, including area code) SECURITIES REGISTERED PURSUANT TO SECTION 12(b) OF THE ACT: SECURITIES REGISTERED PURSUANT TO SECTION 12(g) OF THE ACT: Title of Class None Indicate by check mark if the registrant is a well-known seasoned issuer, as defined in Rule 405 of the Securities Act. Yes (cid:1) No  Indicate by check mark if the registrant is not required to file reports pursuant to Section 13 or 5(d) of the Act. Yes (cid:1) No  Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days. Yes  No (cid:1) Indicate by check mark if disclosure of delinquent filers pursuant to Item 405 of Regulation S-K is not contained herein, and will not be contained, to the best of the registrant’s knowledge, in definitive proxy or information statements incorporated by reference in Part III of this Form 10-K or any amendment to this Form 10-K.  Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer or a non-accelerated filer. See definition of “accelerated filer and large accelerated filer” in Rule 12b-2 of the Exchange Act. (Check one): Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Act.): Yes (cid:1) No  The aggregate market value of the common units held by non-affiliates of the registrant (treating all managers, executive officers and 10% unitholders of the registrant as if they may be affiliates of the registrant) was approximately $413,293,797.04 as of June 30, 2006, based on $25.11 per unit, the closing price of the common units as reported on the Nasdaq Global Market on such date. Number of Common Units outstanding as of March 6, 2007: 28,240,431 DOCUMENTS INCORPORATED BY REFERENCE Portions of the definitive proxy statement for the registrant’s 2007 Annual Meeting of Unitholders to be held on May 16, 2007, are incorporated by reference in Part III of this Form 10-K. Such definitive proxy statement will be filed with the Securities and Exchange Commission not later than 120 days subsequent to December 31, 2006.  Annual Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 for the fiscal year ended December 31, 2006 Or (cid:1) Transition Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 for the transition Period from to Delaware 81-0551518 (State of incorporation) (I.R.S. employer identification number) Title of Each Class Name of Exchange on which Registered Common Units Representing Limited Partnership Interests Nasdaq Global Market Large accelerated filer (cid:1) Accelerated filer  Non-accelerated filer (cid:1) Table of Contents Index to Financial Statements TABLE OF CONTENTS PART I 1 ITEM 1. BUSINESS 1 ITEM 1A. RISK FACTORS 4 ITEM 1B. UNRESOLVED STAFF COMMENTS 17 ITEM 2. PROPERTIES 17 ITEM 3. LEGAL PROCEEDINGS 26 ITEM 4. SUBMISSION OF MATTERS TO A VOTE OF UNITHOLDERS 26 PART II 27 ITEM 5. MARKET FOR REGISTRANT’S COMMON EQUITY, RELATED UNITHOLDER MATTERS AND ISSUER PURCHASES OF EQUITY SECURITIES 27 ITEM 6. SELECTED FINANCIAL DATA 29 ITEM 7. MANAGEMENT’S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS 29 ITEM 7A. QUANTITATIVE AND QUALITATIVE DISCLOSURES ABOUT MARKET RISK 36 ITEM 8. FINANCIAL STATEMENTS AND SUPPLEMENTARY DATA 36 ITEM 9. CHANGES IN AND DISAGREEMENTS WITH ACCOUNTANTS ON ACCOUNTING AND FINANCIAL DISCLOSURE 36 ITEM 9A. CONTROLS AND PROCEDURES 36 ITEM 9B. OTHER INFORMATION 37 PART III 38 ITEM 10. DIRECTORS, EXECUTIVE OFFICERS AND CORPORATE GOVERNANCE 38 ITEM 11. EXECUTIVE COMPENSATION 38 ITEM 12. SECURITY OWNERSHIP OF CERTAIN BENEFICIAL OWNERS AND MANAGEMENT AND RELATED UNITHOLDER MATTERS 38 ITEM 13. CERTAIN RELATIONSHIPS AND RELATED TRANSACTIONS; AND DIRECTOR INDEPENDENCE 38 ITEM 14. PRINCIPAL ACCOUNTING FEES AND SERVICES 38 PART IV 39 ITEM 15. EXHIBITS, FINANCIAL STATEMENT SCHEDULES 39 GLOSSARY OF CERTAIN OIL AND GAS TERMS 41 SIGNATURES 44 INDEX TO FINANCIAL STATEMENTS F-1 Table of Contents Index to Financial Statements PART I. General Dorchester Minerals, L.P. is a publicly traded Delaware limited partnership that commenced operations on January 31, 2003 upon the combination of Dorchester Hugoton, Ltd., Republic Royalty Company, L.P. and Spinnaker Royalty Company, L.P. Dorchester Hugoton was a publicly traded Texas limited partnership and Republic and Spinnaker were private Texas limited partnerships. Our common units are listed on the Nasdaq Global Market. American Stock Transfer & Trust Company is our Registrar and Transfer Agent. Their address and telephone number is 59 Maiden Lane, New York, NY 10038, (800) 937-5449. Our executive offices are located at 3838 Oak Lawn Avenue, Suite 300, Dallas, Texas, 75219-4541 and our telephone number is (214) 559-0300. We do not have an Internet website. We will provide electronic or paper copies of our annual report on Form 10-K, quarterly reports on Form 10-Q, or current reports on Form 8-K and amendments to those reports filed or furnished to the Securities and Exchange Commission, free of charge upon written request at our executive offices. In this report, the term “Partnership,” as well as the terms “us,” “our,” “we,” and “its,” are sometimes used as abbreviated references to Dorchester Minerals, L.P. itself or Dorchester Minerals, L.P. and its related entities. Our general partner is Dorchester Minerals Management LP, which is managed by its general partner, Dorchester Minerals Management GP LLC. As a result, the Board of Managers of Dorchester Minerals Management GP LLC exercises effective control of our Partnership. In this report, the term “general partner” is used as an abbreviated reference to Dorchester Minerals Management LP. Our general partner also controls and owns, directly and indirectly, all of the partnership interests in Dorchester Minerals Operating LP and its general partner, Dorchester Minerals Operating GP LLC. Dorchester Minerals Operating LP owns working interests and other properties underlying our Net Profits Interests, provides day-to-day operational and administrative services to us and our general partner and is the employer of all of the employees who perform such services. In this report, the term “operating partnership” is used as an abbreviated reference to Dorchester Minerals Operating LP. Our wholly owned subsidiary, Dorchester Minerals Acquisition LP has been and may continue to be used as a vehicle through which we may acquire oil and gas properties. Our general partner and the operating partnership are Delaware limited partnerships and the general partner of our general partner and Dorchester Minerals Operating GP LLC are Delaware limited liability companies. These entities and our Partnership were initially formed in December 2001 in connection with the combination that occurred on January 31, 2003. Dorchester Minerals Acquisition LP is an Oklahoma limited partnership and Dorchester Minerals Acquisition GP, Inc. is an Oklahoma corporation that serves as its general partner. Both were formed in September 2004 in connection with an acquisition of oil and gas properties that was consummated on September 30, 2004. Our business may be described as the acquisition, ownership and administration of Net Profits Interests and Royalty Properties. The Net Profits Interests represent net profits overriding royalty interests in various properties owned by the operating partnership. The Royalty Properties consist of producing and nonproducing mineral, royalty, overriding royalty, net profits, and leasehold interests located in 573 counties and parishes in 25 states. Our partnership agreement requires that we distribute quarterly an amount equal to all funds that we receive from the Net Profits Interests and the Royalty Properties less certain expenses and reasonable reserves. 1 ITEM 1. BUSINESS Table of Contents Index to Financial Statements We intend to grow by acquiring additional oil and natural gas properties, subject to the limitations described below. The approval of the holders of a majority of our outstanding common units is required for our general partner to cause us to acquire or obtain any oil and natural gas property interest, unless the acquisition is complementary to our business and is made either: Unless otherwise approved by the holders of a majority of our common units, in the event that we acquire properties for a combination of cash and limited partner interests, including common units, (i) the cash component of the acquisition consideration must be equal to or less than 5% of the aggregate cash distributions made by our Partnership for the four most recent quarters and (ii) the amount of limited partnership interests, including common units, to be issued in such acquisition, after giving effect to such issuance, shall not exceed 10% of the common units outstanding. Credit Facilities and Financing Plans We do not have a credit facility in place, nor do we anticipate doing so. We do not anticipate incurring any debt, other than trade debt incurred in the ordinary course of our business. Our partnership agreement prohibits us from incurring indebtedness, other than trade payables, (i) in excess of $50,000 in the aggregate at any given time; or (ii) which would constitute “acquisition indebtedness” (as defined in Section 514 of the Internal Revenue Code of 1986, as amended), in order to avoid unrelated business taxable income for federal income tax purposes. We may finance any growth of our business through acquisitions of oil and natural gas properties by issuing additional limited partnership interests or with cash, subject to the limits described above and in our partnership agreement. Under our partnership agreement, we may also finance our growth through the issuance of additional partnership securities, including options, rights, warrants and appreciation rights with respect to partnership securities, from time to time in exchange for the consideration and on the terms and conditions established by our general partner in its sole discretion. However, we may not issue limited partnership interests that would represent over 20% of the outstanding limited partnership interests immediately after giving effect to such issuance or that would have greater rights or powers than our common units without the approval of the holders of a majority of our outstanding common units. Except in connection with qualifying acquisitions, we do not currently anticipate issuing additional partnership securities. On May 2, 2005, we filed a registration statement on Form S-4 with the Securities and Exchange Commission to register 5,000,000 common units that may be offered and issued by the Partnership from time to time in connection with asset acquisitions or other business combination transactions. At present, none of the 5,000,000 units have been offered. Regulation Many aspects of the production, pricing and marketing of crude oil and natural gas are regulated by federal and state agencies. Legislation affecting the oil and natural gas industry is under constant review for amendment or expansion, which frequently increases the regulatory burden on affected members of the industry. Exploration and production operations are subject to various types of regulation at the federal, state and local levels. Such regulation includes: 2 • in exchange for our limited partner interests, including common units, not exceeding 20% of the common units outstanding after issuance; or • in exchange for cash, if the aggregate cost of any acquisitions made for cash during the twelve month period ending on the first to occur of the execution of a definitive agreement for the acquisition or its consummation is no more than 10% of our aggregate cash distributions for the four most recent fiscal quarters. • permits for the drilling of wells; • bonding requirements in order to drill or operate wells; Table of Contents Index to Financial Statements Oil and natural gas operations are also subject to various conservation laws and regulations. These regulations govern the size of drilling and spacing units or proration units and the density of wells which may be drilled and the unitization or pooling of oil and natural gas properties. In addition, state conservation laws establish a maximum allowable production from oil and natural gas wells. These state laws also generally prohibit the venting or flaring of natural gas and impose certain requirements regarding the ratability of production. These regulations can limit the amount of oil and natural gas that the operators of our properties can produce. The transportation of natural gas after sale by operators of our properties is sometimes subject to regulation by state authorities. The interstate transportation of natural gas is subject to federal governmental regulation, including regulation of tariffs and various other matters, by the Federal Energy Regulatory Commission. Customers and Pricing The pricing of oil and natural gas sales is primarily determined by supply and demand in the marketplace and can fluctuate considerably. As a royalty owner, we have extremely limited access to timely information, involvement, and operational control over the volumes of oil and natural gas produced and sold and the terms and conditions on which such volumes are marketed and sold. The operating partnership sells most of its natural gas production to Williams Power Company, Inc. on a daily market price basis through October 2007. The operating partnership frequently reviews alternative gas purchasers. We believe that the loss of Williams Power by the operating partnership or the loss of any single customer would not have a material adverse effect on us. Acquisitions On September 30, 2004, we acquired producing and nonproducing mineral, royalty and overriding royalty interests located in 104 counties and parishes in six states in exchange for total consideration of 1,200,000 of our common units. The transaction was structured as a merger between the seller and our wholly owned subsidiary, Dorchester Minerals Acquisition LP. We acquired minor mineral and leasehold interests located in Steuben County, New York and Hidalgo County, Texas during 2004. We have not made any acquisitions since 2004. Competition The energy industry in which we compete is subject to intense competition among many companies, both larger and smaller than we are, many of which have financial and other resources greater than we have. 3 • the location and number of wells; • the method of drilling and casing wells; • the surface use and restoration of properties upon which wells are drilled; • the plugging and abandonment of wells; • numerous federal and state safety requirements; • environmental requirements; • property taxes and severance taxes; and • specific state and federal income tax provisions. Table of Contents Index to Financial Statements Operating Hazards and Uninsured Risks Our operations do not directly involve the operational risks and uncertainties associated with drilling for, and the production and transportation of, oil and natural gas. However, we may be indirectly affected by the operational risks and uncertainties faced by the operators of our properties, including the operating partnership, whose operations may be materially curtailed, delayed or canceled as a result of numerous factors, including: Also, the ability of the operators of our properties to market oil and natural gas production depends on numerous factors, many of which are beyond their control, including: The occurrence of an operational risk or uncertainty which materially impacts the operations of the operators of our properties could have a material adverse effect on the amount that we receive in connection with our interests in production from our properties, which could have a material adverse effect on our financial condition or result of operations. In accordance with customary industry practices, we maintain insurance against some, but not all, of the risks to which our business exposes us. While we believe that we are reasonably insured against these risks, the occurrence of an uninsured loss could have a material adverse effect on our financial condition or results of operations. Employees As of February 28, 2007, the operating partnership had 19 full-time employees in our Dallas, Texas office and nine full-time employees in field locations. Risks Related to Our Business Our cash distributions are highly dependent on oil and natural gas prices, which have historically been very volatile. Our quarterly cash distributions depend in significant part on the prices realized from the sale of oil and, in particular, natural gas. Historically, the markets for oil and natural gas have been volatile and may continue to be volatile in the future. Various factors that are beyond our control will affect prices of oil and natural gas, such as: 4 • the presence of unanticipated pressure or irregularities in formations; • accidents; • title problems; • weather conditions; • compliance with governmental requirements; and • shortages or delays in the delivery of equipment. • capacity and availability of oil and natural gas systems and pipelines; • effect of federal and state production and transportation regulations; • changes in supply and demand for oil and natural gas; and • creditworthiness of the purchasers of oil and natural gas. ITEM IA. RISK FACTORS • the worldwide and domestic supplies of oil and natural gas; • the ability of the members of the Organization of Petroleum Exporting Countries and others to agree to and maintain oil prices and production controls; Table of Contents Index to Financial Statements Lower oil and natural gas prices may reduce the amount of oil and natural gas that is economic to produce and may reduce our revenues and operating income. The volatility of oil and natural gas prices reduces the accuracy of estimates of future cash distributions to unitholders. Terrorist attacks on oil and natural gas production facilities, transportation systems and storage facilities could have a material adverse impact on our business. Oil and natural gas production facilities, transportation systems and storage facilities could be targets of terrorist attacks. These attacks could have a material adverse impact if certain oil and natural gas infrastructure integral to our operations were interrupted, damaged or destroyed, thus preventing the sale of oil and natural gas. We do not control operations and development of the Royalty Properties or the properties underlying the Net Profits Interests that the operating partnership does not operate, which could impact the amount of our cash distributions. As the owner of a fractional undivided mineral or royalty interest, we do not control the development of the Royalty or Net Profits Interest Properties or the volumes of oil and natural gas produced from them, and our ability to influence development of nonproducing properties is severely limited. Also, since one of our stated business objectives is to avoid the generation of unrelated business taxable income, we are prohibited from participation in the development of our properties as a working interest or other expense-bearing owner. The decision to explore or develop these properties, including infill drilling, exploration of horizons deeper or shallower than the currently producing intervals, and application of enhanced recovery techniques will be made by the operator and other working interest owners of each property (including our lessees) and may be influenced by factors beyond our control, including but not limited to oil and natural gas prices, interest rates, budgetary considerations and general industry and economic conditions. Our unitholders are not able to influence or control the operation or future development of the properties underlying the Net Profits Interests. The operating partnership is unable to influence significantly the operations or future development of properties that it does not operate. The operating partnership and the other current operators of the properties underlying the Net Profits Interests are under no obligation to continue operating the underlying properties. The operating partnership can sell any of the properties underlying the Net Profits Interests that it operates and relinquish the ability to control or influence operations. Any such sale or transfer must also simultaneously include the Net Profits Interests at a corresponding price. Our unitholders do not have the right to replace an operator. Our lease bonus revenue depends in significant part on the actions of third parties which are outside of our control. A significant portion of the Royalty Properties are unleased mineral interests. With limited exceptions, we have the right to grant leases of these interests to third parties. We anticipate receiving cash payments as bonus 5 • political instability or armed conflict in oil-producing regions; • the price and level of foreign imports; • the level of consumer demand; • the price and availability of alternative fuels; • the availability of pipeline capacity; • weather conditions; • domestic and foreign governmental regulations and taxes; and • the overall economic environment. Table of Contents Index to Financial Statements consideration for granting these leases in most instances. Our ability to influence third parties’ decisions to become our lessees with respect to these nonproducing properties is severely limited, and those decisions may be influenced by factors beyond our control, including but not limited to oil and natural gas prices, interest rates, budgetary considerations, and general industry and economic conditions. The operating partnership may transfer or abandon properties that are subject to the Net Profits Interests. Our general partner, through the operating partnership, may at any time transfer all or part of the properties underlying the Net Profits Interests. Our unitholders are not entitled to vote on any transfer; however, any such transfer must simultaneously include the Net Profits Interests at a corresponding price. The operating partnership or any transferee may abandon any well or property if it reasonably believes that the well or property can no longer produce in commercially economic quantities. This could result in termination of the Net Profits Interests relating to the abandoned well. Cash distributions are affected by production and other costs, some of which are outside of our control. The cash available for distribution that comes from our royalty and mineral interests, including the Net Profits Interests, is directly affected by increases in production costs and other costs. Some of these costs are outside our control, including costs of regulatory compliance and severance and other similar taxes. Other expenditures are dictated by business necessity, such as drilling additional wells in response to the drilling activity of others. Our oil and natural gas reserves and the underlying properties are depleting assets, and there are limitations on our ability to replace them. Our revenues and distributions depend in large part on the quantity of oil and natural gas produced from properties in which we hold an interest. Over time, all of our producing oil and natural gas properties will experience declines in production due to depletion of their oil and natural gas reservoirs, with the rates of decline varying by property. Replacement of reserves to maintain production levels requires maintenance, development or exploration projects on existing properties, or the acquisition of additional properties. The timing and size of any maintenance, development or exploration projects depends on the market prices of oil and natural gas and on other factors beyond our control. Many of the decisions regarding implementation of such projects, including drilling or exploration on any unleased and undeveloped acreage, will be made by third parties. In addition, development possibilities in the Hugoton field are limited by the developed nature of that field and by regulatory restrictions. Our ability to increase reserves through future acquisitions is limited by restrictions on our use of cash and limited partnership interests for acquisitions and by our general partner’s obligation to use all reasonable efforts to avoid unrelated business taxable income. In addition, the ability of affiliates of our general partner to pursue business opportunities for their own accounts without tendering them to us in certain circumstances may reduce the acquisitions presented to our Partnership for consideration. Drilling activities on our properties may not be productive, which could have an adverse effect on future results of operations and financial condition. The operating partnership may undertake drilling activities in limited circumstances on the properties underlying the Net Profits Interests, and third parties may undertake drilling activities on our other properties. Any increases in our reserves will come from such drilling activities or from acquisitions. 6 Table of Contents Index to Financial Statements Drilling involves a wide variety of risks, including the risk that no commercially productive oil or natural gas reservoirs will be encountered. The cost of drilling, completing and operating wells is often uncertain and drilling operations may be delayed or canceled as a result of a variety of factors, including: Future drilling activities on our properties may not be successful. If these activities are unsuccessful, this failure could have an adverse effect on our future results of operations and financial condition. In addition, under the terms of the Net Profits Interests, the costs of unsuccessful future drilling on the working interest properties that are subject to the Net Profits Interests will reduce amounts payable to us under the Net Profits Interests by 96.97% of these costs. Our ability to identify and capitalize on acquisitions is limited by contractual provisions and substantial competition. Our partnership agreement limits our ability to acquire oil and natural gas properties in the future, especially for consideration other than our limited partnership interests. Because of the limitations on our use of cash for acquisitions and on our ability to accumulate cash for acquisition purposes, we may be required to attempt to effect acquisitions with our limited partnership interests. However, sellers of properties we would like to acquire may be unwilling to take our limited partnership interests in exchange for properties. Our partnership agreement obligates our general partner to use all reasonable efforts to avoid generating unrelated business taxable income. Accordingly, to acquire working interests we would have to arrange for them to be converted into overriding royalty interests, net profits interests, or another type of interest that does not generate unrelated business taxable income. Third parties may be less likely to deal with us than with a purchaser to which such a condition would not apply. These restrictions could prevent us from pursuing or completing business opportunities that might benefit us and our unitholders, particularly unitholders who are not tax-exempt investors. The duty of affiliates of our general partner to present acquisition opportunities to our Partnership is limited, pursuant to the terms of the Amended and Restated Business Opportunities Agreement. Accordingly, business opportunities that could potentially be pursued by us might not necessarily come to our attention, which could limit our ability to pursue a business strategy of acquiring oil and natural gas properties. We compete with other companies and producers for acquisitions of oil and natural gas interests. Many of these competitors have substantially greater financial and other resources than we do. Any future acquisitions will involve risks that could adversely affect our business, which our unitholders generally will not have the opportunity to evaluate. Our current strategy contemplates that we may grow through acquisitions. We expect to participate in discussions relating to potential acquisition and investment opportunities. If we consummate any additional acquisitions, our capitalization and results of operations may change significantly and our unitholders will not have the opportunity to evaluate the economic, financial and other relevant information that we will consider in connection with the acquisition, unless the terms of the acquisition require approval of our unitholders. 7 • pressure or irregularities in formations; • equipment failures or accidents; • unexpected drilling conditions; • shortages or delays in the delivery of equipment; • adverse weather conditions; and • disputes with drill-site owners. Table of Contents Index to Financial Statements Additionally, our unitholders will bear 100% of the dilution from issuing new common units while receiving essentially 96% of the benefit as 4% of the benefit goes to our general partner. Acquisitions and business expansions involve numerous risks, including assimilation difficulties, unfamiliarity with new assets or new geographic areas and the diversion of management’s attention from other business concerns. In addition, the success of any acquisition will depend on a number of factors, including the ability to estimate accurately the recoverable volumes of reserves, rates of future production and future net revenues attributable to reserves and to assess possible environmental liabilities. Our review and analysis of properties prior to any acquisition will be subject to uncertainties and, consistent with industry practice, may be limited in scope. We may not be able to successfully integrate any oil and natural gas properties that we acquire into our operations or we may not achieve desired profitability objectives. A natural disaster or catastrophe could damage pipelines, gathering systems and other facilities that service our properties, which could substantially limit our operations and adversely affect our cash flow. If gathering systems, pipelines or other facilities that serve our properties are damaged by any natural disaster, accident, catastrophe or other event, our income could be significantly interrupted. Any event that interrupts the production, gathering or transportation of our oil and natural gas, or which causes us to share in significant expenditures not covered by insurance, could adversely impact the market price of our limited partnership units and the amount of cash available for distribution to our unitholders. We do not carry business interruption insurance. The vast majority of the properties subject to the Net Profits Interests are geographically concentrated, which could cause net proceeds payable under the Net Profits Interests to be impacted by regional events. The vast majority of the properties subject to the Net Profits Interests are all natural gas properties that are located almost exclusively in the Hugoton field in Oklahoma and Kansas. Because of this geographic concentration, any regional events, including natural disasters, that increase costs, reduce availability of equipment or supplies, reduce demand or limit production may impact the net proceeds payable under the Net Profits Interests more than if the properties were more geographically diversified. The number of prospective natural gas purchasers and methods of delivery are considerably less than would otherwise exist from a more geographically diverse group of properties. As a result, natural gas sales after gathering and compression tend to be sold to one buyer in each state, thereby increasing credit risk. Under the terms of the Net Profits Interests, much of the economic risk of the underlying properties is passed along to us. Under the terms of the Net Profits Interests, virtually all costs that may be incurred in connection with the properties, including overhead costs that are not subject to an annual reimbursement limit, are deducted as production costs or excess production costs in determining amounts payable to us. Therefore, to the extent of the revenues from the burdened properties, we bear 96.97% of the costs of the working interest properties. If costs exceed revenues, we do not receive any payments under the Net Profits Interests. However, except as described below, we are not required to pay any excess costs. The terms of the Net Profits Interests provide for excess costs that cannot be charged currently because they exceed current revenues to be accumulated and charged in future periods, which could result in our not receiving any payments under the Net Profits Interests until all prior uncharged costs have been recovered by the operating partnership. The practice of combining several years’ Net Profits Interests that have excess costs has enabled the operating partnership to recoup excess costs out of revenues from a greater number of properties, deferring to some degree payments to us with respect to such Net Profits Interests. 8 Table of Contents Index to Financial Statements Damage claims associated with the production and gathering of our oil and natural gas properties could affect our cash flow. The operating partnership owns and operates gathering systems and compression facilities. Casualty losses or damage claims from these operations would be production costs under the terms of the Net Profits Interests and could adversely affect our cash flow. We may indirectly experience costs from repair or replacement of aging equipment. Some of the operating partnership’s current working interest wells were drilled and have been producing since prior to 1954. The 132-mile Oklahoma gas pipeline gathering system was originally installed in or about 1948, and because of its age is in need of periodic repairs and upgrades. Should major components of this system require significant repairs or replacement, the operating partnership may incur substantial capital expenditures in the operation of the Oklahoma properties, which, as production costs, would reduce our cash flow from these properties. Our cash flow is subject to operating hazards and unforeseen interruptions for which we may not be fully insured. Neither we nor the operating partnership are fully insured against certain risks, either because such insurance is not available or because of high premium costs. Operations that affect the properties are subject to all of the risks normally incident to the oil and natural gas business, including blowouts, cratering, explosions and pollution and other environmental damage, any of which could result in substantial decreases in the cash flow from our overriding royalty interests and other interests due to injury or loss of life, damage to or destruction of wells, production facilities or other property, clean-up responsibilities, regulatory investigations and penalties and suspension of operations. Any uninsured costs relating to the properties underlying the Net Profits Interests will be deducted as a production cost in calculating the net proceeds payable to us. Governmental policies, laws and regulations could have an adverse impact on our business and cash distributions. Our business and the properties in which we hold interests are subject to federal, state and local laws and regulations relating to the oil and natural gas industry as well as regulations relating to safety matters. These laws and regulations can have a significant impact on production and costs of production. For example, both Oklahoma and Kansas, where properties that are subject to the Net Profits Interests are located, have the ability, directly or indirectly, to limit production from those properties, and such limitations or changes in those limitations could negatively impact us in the future. As another example, Oklahoma regulations currently require administrative hearings to change the concentration of the operating partnership’s gas production wells from one well for each 640 acres in the Guymon-Hugoton field. Previously, certain interested parties have sought regulatory changes in Oklahoma for “infill,” or increased density, drilling similar to that which is available in Kansas, which allows one well for each 320 acres. Should Oklahoma change its existing regulations to readily permit infill drilling, it is possible that a number of producers will commence increased density drilling in areas adjacent to the properties in Oklahoma that are subject to the Net Profits Interests. If the operating partnership or other operators of our properties do not do the same, our production levels relating to these properties may decrease or mineral owners may demand increased density drilling. Capital expenditures relating to increased density on the properties underlying the Net Profits Interests would be deducted from amounts payable to us under the Net Profits Interests. Environmental costs and liabilities and changing environmental regulation could affect our cash flow. As with other companies engaged in the ownership and production of oil and natural gas, we always expect to have some risk of exposure to environmental costs and liabilities because the costs associated with 9 Table of Contents Index to Financial Statements environmental compliance or remediation could reduce the amount we would receive from our properties. The properties in which we hold interests are subject to extensive federal, state, tribal and local regulatory requirements relating to environmental affairs, health and safety and waste management. Governmental authorities have the power to enforce compliance with applicable regulations and permits, which could increase production costs on our properties and affect their cash flow. Third parties may also have the right to pursue legal actions to enforce compliance. It is likely that expenditures in connection with environmental matters, individually or as part of normal capital expenditure programs, will affect the net cash flow from our properties. Future environmental law developments, such as stricter laws, regulations or enforcement policies, could significantly increase the costs of production from our properties and reduce our cash flow. Our oil and gas reserve data and future net revenue estimates are uncertain. Estimates of proved reserves and related future net revenues are projections based on engineering data and reports of independent consulting petroleum engineers hired for that purpose. The process of estimating reserves requires substantial judgment, resulting in imprecise determinations. Different reserve engineers may make different estimates of reserve quantities and related revenue based on the same data. Therefore, those estimates should not be construed as being accurate estimates of the current market value of our proved reserves. If these estimates prove to be inaccurate, our business may be adversely affected by lower revenues. We are affected by changes in oil and natural gas prices. Oil prices and natural gas prices may experience inverse price changes. Risks Inherent In An Investment In Our Common Units Cost reimbursement due our general partner may be substantial and reduce our cash available to distribute to our unitholders. Prior to making any distribution on the common units, we reimburse the general partner and its affiliates for reasonable costs and expenses of management. The reimbursement of expenses could adversely affect our ability to pay cash distributions to our unitholders. Our general partner has sole discretion to determine the amount of these expenses, subject to the annual limit of 5% of an amount primarily based on our distributions to partners for that fiscal year. The annual limit includes carry-forward and carry-back features, which could allow costs in a year to exceed what would otherwise be the annual reimbursement limit. In addition, our general partner and its affiliates may provide us with other services for which we will be charged fees as determined by our general partner. Our net income as reported for tax and financial statement purposes may differ significantly from our cash flow that is used to determine cash available for distributions. Net income as reported for financial statement purposes is presented on an accrual basis in conformity with accounting principles generally accepted in the United States of America. Unitholder Schedule K-1 tax statements are calculated based on applicable tax conventions, and taxable income as calculated for each year will be allocated among unitholders who hold units on the last day of each month. Distributions, however, are calculated on the basis of actual cash receipts, changes in cash reserves, and disbursements during the relevant reporting period. Consequently, due to timing differences between the receipt of proceeds of production and the point in time at which the production giving rise to those proceeds actually occurs, net income reported on our financial statements and on unitholder K-1’s will not reflect actual cash distributions during that reporting period. Our unitholders have limited voting rights and do not control our general partner, and their ability to remove our general partner is limited. Our unitholders have only limited voting rights on matters affecting our business. The general partner of our general partner manages our activities. Our unitholders only have the right to annually elect the managers comprising the Advisory Committee of the Board of Managers of the general partner of our general partner. Our 10 Table of Contents Index to Financial Statements unitholders do not have the right to elect the other managers of the general partner of our general partner, on an annual or any other basis. Our general partner may not be removed as our general partner except upon approval by the affirmative vote of the holders of at least a majority of our outstanding common units (including common units owned by our general partner and its affiliates), subject to the satisfaction of certain conditions. Our general partner and its affiliates do not own sufficient common units to be able to prevent its removal as general partner, but they do own sufficient common units to make the removal of our general partner by other unitholders difficult. These provisions may discourage a person or group from attempting to remove our general partner or acquire control of us without the consent of our general partner. As a result of these provisions, the price at which our common units trade may be lower because of the absence or reduction of a takeover premium in the trading price. The control of our general partner may be transferred to a third party without unitholder consent. Our general partner has agreed not to withdraw voluntarily as our general partner on or before December 31, 2010 (with limited exceptions), unless the holders of at least a majority of our outstanding common units (excluding common units owned by our general partner and its affiliates) approve the withdrawal. However, the general partner may transfer its general partner interest to a third party in a merger or in a sale of all or substantially all of its assets without the consent of our unitholders. Other than some transfer restrictions agreed to among the owners of our general partner relating to their interests in our general partner, there is no restriction in our partnership agreement or otherwise for the benefit of our limited partners on the ability of the owners of our general partner to transfer their ownership interests to a third party. The new owner of the general partner would then be in a position to replace the management of our Partnership with its own choices. Our general partner and its affiliates have conflicts of interests, which may permit our general partner and its affiliates to favor their own interests to the detriment of unitholders. We and our general partner and its affiliates share, and therefore compete for, the time and effort of general partner personnel who provide services to us. Officers of our general partner and its affiliates do not, and are not required to, spend any specified percentage or amount of time on our business. In fact, our general partner has a duty to manage our Partnership in the best interests of our unitholders, but it also has a duty to operate its business for the benefit of its partners. Some of our officers are also involved in management and ownership roles in other oil and natural gas enterprises and have similar duties to them and devote time to their businesses. Because these shared officers function as both our representatives and those of our general partner and its affiliates and of third parties, conflicts of interest could arise between our general partner and its affiliates, on the one hand, and us or our unitholders, on the other, or between us or our unitholders on the one hand and the third parties for which our officers also serve management functions. As a result of these conflicts, our general partner and its affiliates may favor their own interests over the interests of unitholders. We may issue additional securities, diluting our unitholders’ interests. We can and may issue additional common units and other capital securities representing limited partnership units, including options, warrants, rights, appreciation rights and securities with rights to distributions and allocations or in liquidation equal or superior to the securities described in this document, however, a majority of the unitholders must approve such issuance if (i) the partnership securities to be issued will have greater rights or powers than our common units or (ii) if after giving effect to such issuance, such newly issued partnership securities represent over 20% of the outstanding limited partnership interests. If we issue additional common units, it will reduce our unitholders’ proportionate ownership interest in us. This could cause the market price of the common units to fall and reduce the per unit cash distributions paid to 11 Table of Contents Index to Financial Statements our unitholders. In addition, if we issued limited partnership units with voting rights superior to the common units, it could adversely affect our unitholders’ voting power. Our unitholders may not have limited liability in the circumstances described below and may be liable for the return of certain distributions. Under Delaware law, our unitholders could be held liable for our obligations to the same extent as a general partner if a court determined that the right of unitholders to remove our general partner or to take other action under our partnership agreement constituted participation in the “control” of our business. The general partner generally has unlimited liability for the obligations of our Partnership, such as its debts and environmental liabilities, except for those contractual obligations of our Partnership that are expressly made without recourse to the general partner. In addition, Section 17-607 of the Delaware Revised Uniform Limited Partnership Act provides that, under certain circumstances, a unitholder may be liable for the amount of distribution for a period of three years from the date of distribution. Because we conduct our business in various states, the laws of those states may pose similar risks to our unitholders. To the extent to which we conduct business in any state, our unitholders might be held liable for our obligations as if they were general partners if a court or government agency determined that we had not complied with that state’s partnership statute, or if rights of unitholders constituted participation in the “control” of our business under that state’s partnership statute. In some of the states in which we conduct business, the limitations on the liability of limited partners for the obligations of a limited partnership have not been clearly established. We are dependent upon key personnel, and the loss of services of any of our key personnel could adversely affect our operations. Our continued success depends to a considerable extent upon the abilities and efforts of the senior management of our general partner, particularly William Casey McManemin, its Chief Executive Officer, James E. Raley, its Chief Operating Officer, and H. C. Allen, Jr., its Chief Financial Officer. The loss of the services of any of these key personnel could have a material adverse effect on our results of operations. We have not obtained insurance or entered into employment agreements with any of these key personnel. We are dependent on service providers who assist us with providing Schedule K-1 tax statements to our unitholders. There are a very limited number of service firms that currently perform the detailed computations needed to provide each unitholder with estimated depletion and other tax information to assist the unitholder in various United States income tax computations. There are also very few publicly traded limited partnerships that need these services. As a result, the future costs and timeliness of providing Schedule K-1 tax statements to our unitholders is uncertain. Tax Risks We have not received a ruling or assurances from the IRS or any state or local taxing authority on any matters affecting us. We have not requested, and will not request, any ruling from the Internal Revenue Service, or IRS, or any state or local taxing authority with respect to owning and disposing of our common units or any other matter. It may be necessary to resort to administrative or court proceedings in an effort to sustain some or all of those conclusions or positions taken or expressed by us, and some or all of those conclusions or positions ultimately 12 Table of Contents Index to Financial Statements may not be sustained. Our unitholders and general partner will bear, directly or indirectly, the costs of any contest with the IRS or other taxing authority. We will be subject to federal income tax if we are classified as a corporation and not as a partnership for federal income tax purposes. As stated above, we have not requested, and will not request, any ruling from the IRS as to our status as a partnership for federal income tax purposes. If the IRS were to challenge our federal income tax status, such a challenge could result in an audit of our unitholders tax returns and adjustments to items on their tax returns that are unrelated to their ownership of our common units. In addition, our unitholders would bear the cost of any expenses incurred in connection with an examination of their personal tax returns. If we were taxable as a corporation for federal income tax purposes in any taxable year, our income, gain, losses and deductions would be reflected on our tax return rather than being passed through proportionately to our unitholders, and our net income would be taxed at corporate rates. In addition, some or all of the distributions made to our unitholders would be treated as dividend income without offset for depletion, and distributions would be reduced as a result of the federal, state and local taxes paid by us. The IRS could reallocate items of income, gain, deduction and loss between transferors and transferees of common units if the IRS does not accept our monthly convention for allocating such items. In general, each of our items of income, gain, loss and deduction will, for federal income tax purposes, be determined annually, and one twelfth of each annual amount will be allocated to those unitholders who hold common units on the last business day of each month in that year. In certain circumstances we may make these allocations in connection with extraordinary or nonrecurring events on a more frequent basis. As a result, transferees of our common units may be allocated items of our income, gain, loss and deduction realized by us prior to the date of their acquisition of our common units. There is no specific authority addressing the utilization of this method of allocating items of income, gain, loss and deduction by a publicly traded partnership such as us between transferors and transferees of its common units. If this method is determined to be an unreasonable method of allocation, our income, gain, loss and deduction would be reallocated among our unitholders and our general partner, and our unitholders may have more taxable income or less taxable loss. Our general partner is authorized to revise our method of allocation between transferors and transferees, as well as among our other unitholders whose common units otherwise vary during a taxable period, to conform to a method permitted or required by the Internal Revenue Code and the regulations or rulings promulgated there under. Our unitholders may not be able to deduct losses attributable to their common units. Any losses relating to our unitholders’ common units will be losses related to portfolio income and their ability to use such losses may be limited. Our unitholders’ partnership tax information may be audited. We will furnish our unitholders with a Schedule K-1 tax statement that sets forth their allocable share of income, gains, losses and deductions. In preparing this schedule, we will use various accounting and reporting conventions and various depreciation and amortization methods we have adopted. This schedule may not yield a result that conforms to statutory or regulatory requirements or to administrative pronouncements of the IRS. Further, our tax return may be audited, and any such audit could result in an audit of our unitholders’ individual income tax returns as well as increased liabilities for taxes because of adjustments resulting from the audit. An audit of our unitholders’ returns also could be triggered if the tax information relating to their common units is not consistent with the Schedule K-1 that we are required to provide to the IRS. 13 Table of Contents Index to Financial Statements Our unitholders may have more taxable income or less taxable loss with respect to their common units if the IRS does not respect our method for determining the adjusted tax basis of their common units. We have adopted a reporting convention that will enable our unitholders to track the basis of their individual common units or unit groups and use this basis in calculating their basis adjustments under section 743 of the Internal Revenue Code and gain or loss on the sale of common units. This method does not comply with an IRS ruling that requires a portion of the combined tax basis of all common units to be allocated to each of the common units owned by a unitholder upon a sale or disposition of less than all of the common units and may be challenged by the IRS. If such a challenge is successful, our unitholders may have to recognize more taxable income or less taxable loss with respect to common units disposed of and common units they continue to hold. Tax-exempt investors may recognize unrelated business taxable income. Generally, unrelated business taxable income, or UBTI, can arise from a trade or business unrelated to the exempt purposes of the tax-exempt entity that is regularly carried on by either the tax-exempt entity or a partnership in which the tax-exempt entity is a partner. However, UBTI does not apply to interest income, royalties (including overriding royalties) or net profits interests, whether the royalties or net profits are measured by production or by gross or taxable income from the property. Pursuant to the provisions of our partnership agreement, our general partner shall use all reasonable efforts to prevent us from realizing income that would constitute UBTI. In addition, our general partner is prohibited from incurring certain types and amounts of indebtedness and from directly owning working interests or cost bearing interests and, in the event that any of our assets become working interests or cost bearing interests, is required to assign such interests to the operating partnership subject to the reservation of a net profits overriding royalty interest. However, it is possible that we may realize income that would constitute UBTI in an effort to maximize unitholder value. Tax consequences of combining Net Profits Interests are uncertain. We are prohibited from owning working interests or cost bearing interests and are required to assign such interests to the operating partnership subject to the reservation of a net profits overriding royalty interest. We periodically combine net profits overriding royalty interests that are in a deficit status into a single net profits overriding royalty interest through an exchange transaction. While we believe such combinations are in the best interest of the unitholder, we are unable to predict, with certainty, all the income tax consequences of such combinations. Our unitholders may not be entitled to deductions for percentage depletion with respect to our oil and natural gas interests. Our unitholders will be entitled to deductions for the greater of either cost depletion or (if otherwise allowable) percentage depletion with respect to the oil and natural gas interests owned by us. However, percentage depletion is generally available to a unitholder only if he qualifies under the independent producer exemption contained in the Internal Revenue Code. For this purpose, an independent producer is a person not directly or indirectly involved in the retail sale of oil, natural gas, or derivative products or the operation of a major refinery. If a unitholder does not qualify under the independent producer exemption, he generally will be restricted to deductions based on cost depletion. Our unitholders may have more taxable income or less taxable loss on an ongoing basis if the IRS does not accept our method of allocating depletion deductions. The Internal Revenue Code requires that income, gain, loss and deduction attributable to appreciated or depreciated property that is contributed to a partnership in exchange for a partnership interest in the partnership must be allocated so that the contributing partner is charged with, or benefits from, gain or unrealized loss, referred to as “Built-in Gain” and “Built-in Loss,” respectively, associated with the property at the time of its 14 Table of Contents Index to Financial Statements contribution to the partnership. Our Partnership Agreement provides that the adjusted tax basis of the oil and natural gas properties contributed to us is allocated to the contributing partners for the purpose of separately determining depletion deductions. Any gain or loss resulting from the sale of property contributed to us will be allocated to the partners that contributed the property, in proportion to their percentage interest in the contributed property, to take into account any Built-in Gain or Built-in Loss. This method of allocating Built-in Gain and Built-in Loss is not specifically permitted by the Treasury Regulations, and the IRS may challenge this method. Such a challenge, if successful, could cause our unitholders to recognize more taxable income or less taxable loss on an ongoing basis in respect of their common units. Our unitholders may have more taxable income or less taxable loss on an ongoing basis if the IRS does not accept our method of determining a unitholder’s share of the basis of partnership property. Our general partner utilizes a method of calculating each unitholder’s share of the basis of partnership property that results in an aggregate basis for depletion purposes that reflects the purchase price of common units as paid by the unitholder. This method is not specifically authorized under applicable Treasury regulations, and the IRS may challenge this method. Such a challenge, if successful, could cause our unitholders to recognize more taxable income or less taxable loss on an ongoing basis in respect of their common units. The ratio of the amount of taxable income that will be allocated to a unitholder to the amount of cash that will be distributed to a unitholder is uncertain and cash distributed to a unitholder may not be sufficient to pay tax on the income we allocate to a unitholder. The amount of taxable income realized by a unitholder will be dependent upon a number of factors including: (i) the amount of taxable income recognized by us; (ii) the amount of any gain recognized by us that is attributable to specific asset sales that may be wholly or partially attributable to Built-in Gain and the resulting allocation of such gain to a unitholder, depending on the asset being sold; (iii) the amount of basis adjustment pursuant to the Internal Revenue Code available to a unitholder based on the purchase price for any common units and the amount by which such price was greater or less than a unitholder’s proportionate share of inside tax basis of our assets attributable to the common units when the common units were purchased; and (iv) the method of depletion available to a unitholder. Therefore, it is not possible for us to predict the ratio of the amount of taxable income that will be allocated to a unitholder to the amount of cash that will be distributed to a unitholder. A unitholder may lose his status as a partner of our Partnership for federal income tax purposes if he lends our common units to a short seller to cover a short sale of such common units. If a unitholder loans his common units to a short seller to cover a short sale of common units, he may be considered as having disposed of his ownership of those common units for federal income tax purposes. If so, the unitholder would no longer be a partner of our Partnership for tax purposes with respect to those common units during the period of the loan and may recognize gain or loss from the disposition. As a result, during this period, any of our income, gain, loss or deduction with respect to those common units would not be reportable, and any cash distributions received for those common units would be fully taxable and may be treated as ordinary income. If we are not notified (either directly or through a broker) of a sale or other transfer of common units, some distributions and federal income tax information or reports with respect to such units may not be provided to the purchaser or other transferee of the units and may instead continue to be provided to the original transferor. If our transfer agent or any other nominee holding common units on behalf of a partner is not timely notified, and a proper transfer of ownership is not recorded on the appropriate books and records, of a sale or other transfer of common units, some distributions and federal income tax information or reports with respect to these common units may not be made or provided to the transferee of the units and may instead continue to be 15 Table of Contents Index to Financial Statements made or provided to the original transferor. Notwithstanding a transferee’s failure to receive distributions and federal income tax information or reports from us with respect to these units, the IRS may contend that such transferee is a partner for federal income tax purposes and that some allocations of income, gain, loss or deduction by us should have been reported by such transferee. Alternatively, the IRS may contend that the transferor continues to be a partner for federal income tax purposes and that allocations of income, gain, loss or deduction by us should have been reported by such transferor. If the transferor is not treated as a partner for federal income tax purposes, any cash distributions received by such transferor with respect to the transferred units following the transfer would be fully taxable as ordinary income to the transferor. A sale or exchange of 50% or more of the total interests in our capital and profits within a 12-month period could result in adverse tax consequences to a unitholder. We will terminate for federal income tax purposes if there is a sale or exchange of 50% or more of the total interests in our capital and profits within a 12-month period. A termination would result in the closing of our taxable year for a unitholder. As a result, if a unitholder has a different taxable year than we have, he may be required to include his allocable share of our income, gain, loss, deduction, credits and other items from both the taxable year ending prior to the year of our termination and the short taxable year ending at the time of our termination in the same taxable year. A termination also could result in penalties if we were unable to determine that the termination occurred. Foreign, state and local taxes could be withheld on amounts otherwise distributable to a unitholder. A unitholder may be required to file tax returns and be subject to tax liability in the foreign, state or local jurisdictions where he resides and in each state or local jurisdiction in which we have assets or otherwise do business. We also may be required to withhold state income tax from distributions otherwise payable to a unitholder and state income tax may be withheld by others on royalty payments to us. Disclosure Regarding Forward-Looking Statements Statements included in this report which are not historical facts (including any statements concerning plans and objectives of management for future operations or economic performance, or assumptions or forecasts related thereto), are forward-looking statements. These statements can be identified by the use of forward-looking terminology including “may,” “believe,” “will,” “expect,” “anticipate,” “estimate,” “continue” or other similar words. These statements discuss future expectations, contain projections of results of operations or of financial condition or state other “forward-looking” information. These forward-looking statements are made based upon management’s current plans, expectations, estimates, assumptions and beliefs concerning future events impacting us and therefore involve a number of risks and uncertainties. We caution that forward-looking statements are not guarantees and that actual results could differ materially from those expressed or implied in the forward-looking statements. Because these forward-looking statements involve risks and uncertainties, actual results could differ materially from those expressed or implied by these forward-looking statements for a number of important reasons, including those discussed under “Risk Factors” and elsewhere in this report. You should read these statements carefully because they may discuss our expectations about our future performance, contain projections of our future operating results or our future financial condition, or state other “forward-looking” information. Before you invest, you should be aware that the occurrence of any of the events herein described in “Risk Factors” and elsewhere in this report could substantially harm our business, results of operations and financial condition and that upon the occurrence of any of these events, the trading price of our common units could decline, and you could lose all or part of your investment. 16 Table of Contents Index to Financial Statements None. Facilities Our office in Dallas consists of 11,847 square feet of leased office space. The operating partnership owns a field office in Hooker, Oklahoma and leases part of an office in Amarillo, Texas. Properties We own two categories of properties, the Net Profits Interests and the Royalty Properties. Royalty Properties We own Royalty Properties representing producing and nonproducing mineral, royalty, overriding royalty, net profits and leasehold interests in properties located in 573 counties and parishes in 25 states. Acreage amounts listed herein represent our best estimates based on information provided to us as a royalty owner. Due to the significant number of individual deeds, leases and similar instruments involved in the acquisition and development of the Royalty Properties by us or our predecessors, acreage amounts are subject to change as new information becomes available. In addition, as a royalty owner, our access to information concerning activity and operations on the Royalty Properties is limited. Most of our producing properties are subject to old leases and other contracts pursuant to which we are not entitled to well information. Some of our newer leases provide for access to technical data and other information. We may have limited access to public data in some areas through third party subscription services. Consequently, the exact number of wells producing from, or drilling on the Royalty Properties is not determinable. The primary manner by which we will become aware of activity on the Royalty Properties is the receipt of division orders or other correspondence from operators or purchasers. Acreage Summary The following table sets forth as of December 31, 2006 a summary of our gross and net, where applicable, acres of mineral, royalty, overriding royalty and leasehold interests, and a compilation of the number of counties and parishes and states in which these interests are located. The majority of our net mineral acres are unleased. Acreage amounts may not add across due to overlapping ownership among categories. Our net interest in production from royalty, overriding royalty and leasehold interests is based on lease royalty and other third party contractual terms which vary from property to property. Consequently, net acreage ownership in these categories is not determinable. Our net interest in production from properties in which we own a royalty or overriding royalty interest may be affected by royalty terms negotiated by the mineral interest owners in such tracts and their lessees. Our interest in the majority of these properties is perpetual in nature. However, a minor portion of the properties are subject to terms and conditions pursuant to which a portion of our interest may terminate upon cessation of production. 17 ITEM 1B. UNRESOLVED STAFF COMMENTS ITEM 2. PROPERTIES Mineral Royalty Overriding Leasehold Leasehold Total Number of States 25 17 18 8 25 Number of Counties/Parishes 464 190 140 35 573 Gross 2,256,669 586,418 243,038 35,398 3,121,523 Net (where applicable) 344,862 — — — 344,862 Table of Contents Index to Financial Statements The following table sets forth as of December 31, 2006 the combined summary of total gross and net (where applicable) acres of mineral, royalty, overriding royalty and leasehold interests in each of the states in which these interests are located. Leasing Activity We received cash payments in the amount of $7,377,000 during 2006 attributable to lease bonus on 63 leases and 13 pooling elections in lands located in 33 counties and parishes in seven states. These leases reflected bonus payments ranging up to $675/acre and initial royalty terms ranging up to 30%. Many of these leases contain additional overriding royalty interests, and provisions for optional working interest participation in subsequent wells, back-in working interests after payout or escalating royalty terms. We received cash payments in the amount of $365,000 during the fourth quarter of 2006 attributable to lease bonus on 10 leases and five pooling elections of our interests in lands located in 10 counties and parishes in four states. These leases reflected bonus payments ranging up to $400/acre and initial royalty terms ranging up to 30%. The following table sets forth a summary of leases and pooling elections consummated during 2004 through 2006. Seven leases were granted for no bonus consideration in 2006, which reflected royalty terms ranging from 25% to 30%. Average bonus and royalty terms reflected above include these seven leases. Thirteen leases were granted in 2006 which included (in addition to royalty or bonus) an overriding royalty interest, back-in working interest or optional working interest participation. Average royalty terms reflected above do not reflect these additional interests. Amounts reflected above may differ from the financial statements which are presented on an accrual basis. Average Royalty and Average Bonus exclude amounts attributable to pooling elections. Payments received for gas storage, shut-in and delay rental payments, coal royalty, surface use agreements, litigation 18 State Gross Net State Gross Net Alabama 106,074 7,797 Missouri 334 43 Arkansas 46,951 15,113 Montana 281,991 62,630 California 924 162 Nebraska 3,360 257 Colorado 22,880 1,424 New Mexico 44,530 2,194 Florida 88,832 24,249 New York 23,077 18,440 Georgia 3,676 1,024 North Dakota 293,614 37,201 Illinois 4,729 885 Oklahoma 228,655 15,999 Indiana 303 113 Pennsylvania 9,511 4,653 Kansas 13,981 2,385 South Dakota 14,408 1,266 Kentucky 1,995 553 Texas 1,637,822 134,507 Louisiana 133,408 1,670 Utah 5,937 200 Michigan 54,367 2,623 Wyoming 28,128 1,057 Mississippi 72,036 8,417 2006 2005 2004 Consummated Leases Number 76 78 42 Number of States 7 5 5 Number of Counties 33 26 26 Average Royalty 25.5 % 24.8 % 24.0 % Average Bonus, $/acre $ 528 $ 309 $ 256 Total Lease Bonus—cash basis $ 7,377,000 $ 1,680,000 $ 1,654,000 Table of Contents Index to Financial Statements judgments and settlement proceeds are reflected in our financial statements in various categories including, but not limited to, other operating revenues and other income. Drilling Activity We received division orders for, or otherwise identified 377 new wells completed on our Royalty Properties in 12 states during 2006. Selected new wells and the net revenue interest (NRI) owned therein by us are summarized in the following table: Additional information concerning selected recent activity is summarized below: Jeffress (Vicksburg S) Field, Hidalgo County, Texas — We own varying undivided mineral interests in several thousand acres in the greater Jeffress Field area of western Hidalgo County, Texas. Jeffress and associated nearby fields produce gas and condensate from tight Vicksburg sandstone reservoirs at depths ranging from 8,000 feet to 14,000 feet. El Paso Production and XTO Energy are the most active operators in this area. We leased our interest in approximately 417 acres to Dan A. Hughes Company (“Hughes”) in October 2005 for a 25% royalty. In addition, the operating partnership was granted a 5% overriding royalty interest which was convertible to a 25% working interest at payout of the first well. The operating partnership has the option, but not the obligation, to participate for a 25% working interest in all future wells drilled on the 417 acre tract or within a surrounding area comprising approximately 1,000 acres. Please refer to the discussion under “Net Profits Interests—Drilling Activity” for more details concerning the participation option. Hughes drilled the Coates-Dorchester #1 well in November 2005 to a permitted total depth of 11,500 feet. The well was tested to sales on January 26, 2006 at rates of 3,263 mcfd and 96 bbls per day. The Coates-Dorchester #2 was drilled in September 2006 to a total depth of 8,900 feet. The well was completed in the Vicksburg formation on November 3, 2006 with test rates of 1,424 mcf and 38 bbls per day. Hughes permitted a third well, the Coates-Dorchester #3, in January 2007 to a total depth of 10,500 feet. We own a 6.25% net revenue interest in these three wells. T-Patch (Reklaw OSO) Field, Jim Hogg and Starr Counties, Texas —We own varying undivided mineral interests totaling 6,524/2,128 gross/net acres in multiple tracts in Jim Hogg and Starr Counties, Texas and which we leased to EOG Resources, Inc. (“EOG”) in 2004 and 2006. EOG completed eight wells on these lands in 2004 and 2005. In 2006, EOG drilled and completed two additional wells on these lands. The Guerra Mineral Trust No. 1 well was drilled in January 2006 to a permitted total depth of 8,100 feet and was tested to sales at rates of 6,531 mcf and 126 bbls per day on March 21, 2006. The Guerra Mineral Trust No. 2 well was drilled in March 2006 to a total depth of 8,000 feet and was tested to sales at rates of 10,778 mcf and 106 bbls per day on March 27, 2006. By December 2006 production from both wells had declined to an average rate of 19 Test Rates State County/Parish Operator Well Name NRI Gas, mcf Oil, bbls Texas Starr EOG Resources Guerra Mineral Trust #1 10.2 % 6,531 126 Texas Starr EOG Resources Guerra Mineral Trust #2 10.2 % 10,778 106 Texas Starr EOG Resources Southwest Texas Corp #7 5.1 % 2,873 118 Texas Hidalgo Dan A. Hughes Coates-Dorchester #1 6.3 % 3,263 96 Texas Hidalgo Dan A. Hughes Coates-Dorchester #2 6.3 % 1,424 38 Texas Panola Chesapeake Bill Powers A #2 5.5 % 1,006 354 New Mexico Eddy LCX Energy 1625 Fed Com #311 3.6 % 1,627 —New Mexico Lea Devon Energy Paloma Blanco 20 Fed #1 5.0 % 2,004 66 Texas Brooks Kerr McGee Nellie Garcia #1 9.4 % 1,096 19 Texas Goliad ETOCO Heard Unit #2 1.2 % 8,960 109 Texas Goliad ETOCO Heard Unit #1 1.2 % 8,324 188 Oklahoma Roger Mills JMA Energy Hutson Farms 6-18 1.6 % 6,637 15 Texas Wheeler Devon Energy Effie Hayes 18-3 3.1 % 3,004 17 Table of Contents Index to Financial Statements approximately 200 mcf. We own a 10.2% net revenue interest in these two wells. EOG permitted an eleventh well, the Southwest Texas Corp. #8, in February 2007 to a total depth of 10,200 feet. Fayetteville Shale Trend of Northern Arkansas —We own varying undivided perpetual mineral interests totaling 23,336/11,464 gross/net acres located in Cleburne, Conway, Faulkner, Franklin, Johnson, Pope, Van Buren, and White counties, Arkansas in an area commonly referred to as the “Fayetteville Shale” trend of the Arkoma Basin. As of December 31, 2005, approximately 20,307/10,183 gross/net acres of these lands were unleased. Southwestern Energy and Chesapeake Energy are the most active operators in this trend. We received numerous lease offers for our interests during 2005 and early 2006, which offers we routinely declined in order to gather additional information about the trend. On January 30, 2006, we circulated a Request For Proposals to industry participants, soliciting expressions of interest concerning these lands. On March 30, 2006, we entered into an agreement to lease our interest in certain lands in the eight counties named above for which we received a $616,000 non-refundable payment. This amount was included in the first quarter distribution to our unitholders. On June 29, 2006, we leased our average 8.6% mineral interest in 179 sections in these eight counties and received additional payments totaling $5,535,000. This amount was included in the second quarter distribution to our unitholders. The leases reflect 25% royalty and five year primary terms. The sum of the non-refundable payment received in March and the payments received upon consummation of the leases totaled $6,151,000 and represents lease bonus payments of approximately $625 per acre. Assuming the leased lands are pooled into 640 acre units, we will own an average 2.1% net royalty interest in each well drilled in these units. Actual net royalty interests will vary widely from this average interest, based on our actual ownership in each unit. Eleven wells have been permitted on the leased lands as of February 23, 2007. Information concerning these wells is set forth below: Test Rate County Operator Well Name NRI (1) Gas, mcf Cleburne SEECO Mulliniks 9-12 #1-35H 3.516 % — Cleburne SEECO Mulliniks 9-12 #2-35H 3.516 % — Cleburne SEECO Mulliniks 9-12 #3-35H 3.516 % — Cleburne SEECO Quattlebaum #2-32H 0.781 % — Conway David Arrington Beverly Crofford #1-14H 1.563 % — Conway SEECO Jerome Carr #1-31H 2.207 % 1,846 Conway SEECO Jerome Carr #2-31H 2.207 % 3,234 Conway SEECO Polk 09-15 #1-30H 5.898 % — Pope Penn Virginia Tackett #1-33H 1.563 % — Van Buren SEECO Quattlebaum #1-32H 0.781 % 1,717 White Chesapeake Hays 8-6 #1-18H 0.781 % — Our estimated proved reserves as of December 31, 2006 reflect our net royalty interests in four wells with average estimated gross ultimate reserves of 0.9 BCF per well. In addition, the operating partnership has the option, but not the obligation, to participate for an average 3.5% working interest in 111 of the 179 sections. Please refer to the discussion under “Net Profits Interests—Drilling Activity” for additional information concerning the participation option. Haley Field Area, Loving and Winkler Counties, Texas —We own varying undivided mineral and royalty interests in over 90 sections located in north central Loving and western Winkler counties, Texas and 20 (1) NRI means Net Revenue Interest Table of Contents Index to Financial Statements southeastern Lea County, New Mexico in the vicinity of the Haley Field. Operators active in this area include Anadarko, Browning Oil, Chesapeake Energy and Forest Oil. We leased our interests in 2004 and 2005 in 39 sections for a 25% royalty and bonuses ranging up to $700/acre. In addition, the operating partnership has the option, but not the obligation, to participate for a 10% working interest in wells drilled in 11 of these sections, which option is exercisable after the first well is drilled in each of these sections and in all subsequent wells. Each of these interests is proportionately reduced to our mineral interest in each tract. The optional working interest is part of the 2003-2006 NPI. As of December 31, 2006, no well permits have been identified by us on these lands. Net Profits Interests We own net profits overriding royalty interests (referred to as the Net Profits Interests) in various properties owned by the operating partnership. We receive monthly payments equaling 96.97% of the net profits actually realized by the operating partnership from these properties in the preceding month. In the event costs exceed revenues on a cash basis in a given month for properties subject to a Net Profits Interest, no payment is made and any deficit is accumulated and carried over and reflected in the following month’s calculation of net profit. We own four separate Net Profits Interests, three of which were created in connection with the combination in 2003. Each of these three Net Profits Interests have been in a continuous profit status in that revenues have exceeded costs and payments have been made by the operating partnership to us each quarter. In accordance with our partnership agreement we have the continuing right and obligation to create additional Net Profits Interests by transferring properties to the operating partnership subject to the reservation of a Net Profits Interest identical to the Net Profit Interests created at the time of our combination in 2003. The purpose of such Net Profits Interests is to avoid the Partnership’s participation as a working interest or other cost-bearing owner that could result in unrelated business taxable income. Net profits interest payments are not considered unrelated business taxable income for tax purposes. One such Net Profits Interest was created for each of calendar years 2003 through 2006 by transferring various properties to the operating partnership subject to a Net Profit Interest. These interests were subsequently combined and we currently refer to them as the 2003-2006 NPI which is our fourth separate Net Profits Interest. As of December 31, 2006, cumulative operating and development costs presented in the following table, which include amounts equivalent to an interest charge, exceeded cumulative revenues of the 2003-2006 NPI, resulting in a cumulative deficit. All cumulative deficits (which represent cumulative excess of operating and development costs over revenue received) are borne 100% by our General Partner until the 2003-2006 NPI recovers the deficit amount. Once in profit status, we will receive the Net Profits Interest payment attributable to these properties. Our financial statements do not reflect activity attributable to properties subject to Net Profits Interests that are in a deficit status. Consequently, net profits interest payments, production sales volumes and prices, and oil and gas reserves set forth in other portions of this annual report do not reflect amounts attributable to the 2003-2006 NPI. The following tables set forth cash receipts and disbursements, production volumes and reserves attributable to the 2003-2006 Net Profits Interest for the calendar years 2003 through 2006. 21 2003-2006 Net Profits Interest Cash Basis Results Year Ended December 31, (in Thousands) Total 2003 2004 2005 2006 (11 mo.) Cash received for revenue $ 4 $ 1,007 $ 1,447 $ 2,487 $ 4,945 Cash paid for operating costs 5 146 249 452 852 Cash paid for development costs 316 1,218 1,086 1,691 4,311 Net cash (paid) received $ (317 ) $ (357 ) $ 112 $ 344 $ (218 ) Cumulative NPI Deficit $ (674 ) $ (562 ) $ (218 ) Table of Contents Index to Financial Statements The revenue amounts, the production volumes, and the proved reserves presented include only properties producing revenue. The development costs amounts pertain to more properties than the properties producing revenue due to timing differences between operating partnership expenditures and oil and gas production and payments to the operating partnership. The indicated prices set forth above are calculated by dividing each year’s gross revenues for each product by the production volume of the corresponding product. Cash received for revenue includes minor amounts of non-product revenue. Such calculation does not necessarily reflect contractual terms for sales and may be affected by transportation costs, location differentials, quality and gravity adjustments and timing differences between production and cash receipts, including release of suspended funds, initial payments for accumulated sales, or prior period adjustments. Amounts in the above tables reflect the operating partnership’s ownership of the subject properties. Net Profits Interest payments to us, if any, will equal 96.97% of the cumulative net profits actually received by the operating partnership attributable to the subject properties. The above production sales volumes, indicated prices, oil and gas reserves, and financial information attributable to the 2003-2006 NPI may not be indicative of future results of the 2003-2006 NPI and may not indicate when the deficit status may end and when Net Profits Interests payment may begin from the 2003-2006 NPI. The 2003-2006 NPI also includes numerous opportunities for the operating partnership to participate as a working interest owner in drilling activity on lands in which we own a mineral or royalty interest that is not subject to a net profits interest. Most of these opportunities are evidenced by a contractual option, but not the obligation, to participate in activity located in defined lands and leases. The operating partnership’s decision to exercise these options and participate as a working interest owner is made on a well-by-well basis and only in the event a third party proposes to drill a well subject to the contractual option. We are therefore unable to project when wells may be drilled, whether the operating partnership may elect to participate in such drilling or the magnitude of the corresponding investment, either individually or in the aggregate, with respect to the 2003-2006 NPI. In the event the operating partnership does elect to participate pursuant to these options, the 2003-2006 NPI deficit is likely to increase. Regardless of the operating partnership’s future participation elections, we believe net profits payments, if any, made upon the 2003-2006 NPI’s first reaching profit status will be minimal as development of these properties and consequently the operating partnership’s payment of development expenditures associated therewith, is likely to continue for at least five years. See the discussion under “Royalty Properties—Drilling Activity” above for additional information on some of these working interest participation options. 22 2003-2006 Net Profits Interest Cash Basis Production Year ended December 31, Total 2003 2004 2005 2006 (11 mo.) Natural Gas mcf 259 138,398 126,167 190,903 455,727 Oil & Condensate bbl 101 5,014 9,434 17,447 31,996 Indicated Gas Price, $/mcf $ 3.92 $ 5.96 $ 7.37 $ 7.26 $ 6.89 Indicated Oil/Condensate Price, $/bbl $ 28.55 $ 36.05 $ 54.58 $ 61.05 $ 55.12 2003-2006 Net Profits Interest Reserves Year ended December 31, 2003 2004 2005 2006 Proved Reserves Natural Gas (mmcf) 231 273 313 532 Oil & Condensate (mbbls) 5 7 32 46 Future Net Revenues ($ in thousands) $ 906 $ 1,352 $ 3,399 $ 4,309 Standardized Measure ($ in thousands) $ 618 $ 1,033 $ 2,655 $ 3,405 Table of Contents Index to Financial Statements Acreage Summary The following tables set forth as of December 31, 2006 information concerning properties owned by the operating partnership and subject to the Net Profits Interests, including the 2003-2006 NPI properties. Acreage amounts listed under Leasehold reflect gross acres leased by the operating partnership and the working interest share (net acres) in those properties. Acreage amounts listed under Mineral reflect gross acres in which the operating partnership owns a mineral interest and the undivided mineral interest (net acres) in those properties. The operating partnership’s interest in these properties may be unleased, leased by others or a combination thereof. Acreage amounts may not add across due to overlapping ownership among categories. The following table reflects the states in which the acreage amounts listed above are located. The operating partnership owns working interests below the currently producing horizons in 47,360 gross/ 46,960 net acres in Texas County, Oklahoma. The operating partnership has from time to time farmed out its leasehold interests in portions of these lands, reserving an overriding royalty interest therein, and will consider additional exploration or development of these lands as circumstances warrant. Drilling Activity Thirty five new wells were completed on our Net Profits Interests located in seven states during 2006, and an additional six wells were in various stages of drilling or completion operations at year-end. Selected new wells drilled in 2006 and the working interest and net revenue interest (WI and NRI) owned therein by the operating partnership are summarized in the following table: 23 Mineral Royalty Leasehold Total Number of States 11 1 6 12 Number of Counties/Parishes 49 1 7 50 Gross Acres 46,637 640 90,627 138,904 Net Acres 4,856 — 81,376 86,232 Mineral/Royalty Leasehold Total Gross Net Gross Net Gross Net Oklahoma 11,084 683 79,861 74,031 90,945 74,714 Kansas 640 20 7,035 7,035 7,675 7,055 All Others 35,553 4,152 3,731 310 39,284 4,462 Totals 47,277 4,855 90,627 81,376 137,904 86,231 Test Rates State County/Parish Operator Well Name WI NRI Gas, mcf Oil, bbls Montana Richland Continental Res. Carda 2-28H 6.3 % 5.9 % 363 875 Oklahoma Ellis Crusader Energy Raiders 2-27H 3.8 % 9.1 % 2,416 318 New Mexico Eddy LCX Energy 1625 Fed Com 311 4.7 % 4.7 % 1,627 —Arkansas Van Buren SEECO Russell 1-33 6.3 % 6.3 % 2,928 —Oklahoma Beckham Chesapeake Eldean 1-28H 2.7 % 3.9 % 1,720 —Texas Hidalgo Dan A. Hughes Coates-Dorchester #2 6.3 % 4.7 % 1,424 38 Oklahoma Ellis Crusader Energy Raiders 1-27 3.8 % 9.1 % 640 —Arkansas Van Buren SEECO Russell 2-33 6.4 % 6.5 % 894 —Arkansas Conway SEECO Jerome Carr 1-31H 3.8 % 3.0 % 1,622 —Montana Richland Slawson Expl. Typhoon Federal 1-22H 1.2 % 1.2 % 212 531 Oklahoma Roger Mills JMA Energy Hutson Farms 8-18 1.6 % 1.6 % 2,428 3 Oklahoma Roger Mills Chesapeake Davis 4-30 1.5 % 1.5 % 1,942 —Oklahoma Roger Mills JMA Energy Hutson Farms 6-18 1.6 % 1.6 % 6,637 15 Table of Contents Index to Financial Statements Jeffress (Vicksburg S) Field, Hidalgo County, Texas —In addition to the basic lease terms of the transaction with Dan A. Hughes Company (“Hughes”) described under “Royalty Properties—Drilling Activity” the operating partnership was granted a five percent overriding royalty interest in the first well which was convertible to a 25% working interest at payout. The operating partnership has the option, but not the obligation to participate for a 25% working interest in all future wells drilled on the 417 acre tract or within a surrounding area comprised of approximately 1,000 acres. The Coates-Dorchester #1 reached payout in July 2006, at which time we elected to convert our overriding royalty interest to a working interest. Pursuant to the agreement we elected to participate with a working interest in the Coates-Dorchester #2 well and the Coates-Dorchester #3 well which was permitted in January 2007. The operating partnership owns a 4.69% net revenue interest in the aforementioned wells. Fayetteville Shale Trend of Northern Arkansas —In addition to the basic lease terms of the Fayetteville Shale transaction described under “Royalty Properties—Drilling Activity”, the operating partnership has the option, but not the obligation, to participate for an average 3.5% net working interest in wells drilled on 111 of the 179 sections covered by the leasing agreements and the unleased mineral interest in the Gravel Hill Field. To date, 14 wells have been permitted on the lands described above. Of these wells, nine have been spud and five have been successfully completed as producers. Set forth below is a summary of the permitted wells: Test Rate County Operator Well Name WI (1) NRI (1) Gas, mcf Cleburne SEECO Mulliniks 9-12 #1-35H 5.000 % 3.750 % —Cleburne SEECO Mulliniks 9-12 #2-35H 5.000 % 3.750 % —Cleburne SEECO Mulliniks 9-12 #3-35H 5.000 % 3.750 % —Conway David Arrington Beverly Crofford #1-14H 1.250 % 0.938 % —Conway SEECO Jerome Carr #1-31H 3.828 % 2.871 % 1,846 Conway SEECO Jerome Carr #2-31H 3.828 % 2.871 % 3,234 Conway SEECO Polk 09-15 #1-30H 5.000 % 3.750 % —Pope Penn Virginia Tackett #1-33H 1.250 % 0.938 % —Van Buren SEECO Hillis #1-27 (vertical) 6.250 % 6.250 % 880 Van Buren SEECO Hillis #2-27H 0.000 % 0.781 % 2,334 Van Buren SEECO Jones 10-16 #1-33H 3.125 % 3.125 % —Van Buren SEECO Jones 10-16 #2-33H 3.125 % 3.125 % —Van Buren SEECO Russell #1-33H 6.250 % 6.250 % 2,928 Van Buren SEECO Russell #2-33H 6.250 % 6.250 % 894 Costs Incurred The following table sets forth information regarding 100% of the costs incurred on a cash basis by the operating partnership during the periods indicated in connection with the properties underlying the Net Profits Interests. (1) WI and NRI mean working interest and net revenue interest, respectively. Years ended December 31, 2006 2005 2004 (in thousands) Acquisition costs $ — $ — $ 213 Development costs (1) 1,963 1,295 1,381 $ 1,963 $ 1,295 $ 1,594 24 (1) The years ended December 31, 2004, 2005 and 2006 include $1,218,000, $1,086,000 and $1,691,000 respectively, attributable to the 2003-2006 NPI. Table of Contents Index to Financial Statements Productive Well Summary The following table sets forth as of December 31, 2006 the combined number of producing wells on the properties subject to the Net Profits Interests, including the 2003-2006 NPI. Gross wells refer to wells in which a working interest is owned. Net wells are determined by multiplying gross wells by the working interest in those wells. Productive Wells/Units ( 1 ) Location Gross Net Oklahoma 192 119.7 Kansas 20 20.0 All others 107 6.5 Total 319 146.2 Oil and Natural Gas Reserves The following table reflects the Partnership’s proved developed and total proved reserves, future net revenues and Standardized Measure at December 31, 2004, 2005 and 2006. The reserves and future net revenues are based on the reports of the independent petroleum engineering consulting firms of Calhoun, Blair & Associates as to the Net Profits Interests and Huddleston & Co., Inc. as to the Royalty Properties. Other than those filed with the SEC, our estimated proved reserves have not been filed with or included in any reports to any federal agency. (1) Multiple well units operated by someone other than the operating partnership and in which we own Net Profits Interests are included as one gross well. 2006 2005 2004 Royalty Properties Net Profits Interest (1) Total Royalty Properties Net Profits Interest (1) Total Royalty Properties Net Profits Interest (1) Total Proved reserves Natural gas (mmcf) (2) 31,363 34,435 65,798 28,965 37,334 66,299 29,626 39,833 69,459 Oil (mmbls) (3) 3,727 75 3,802 3,948 81 4,029 3,893 44 3,937 Future net revenues ($, in thousands) $ 344,893 $ 113,682 $ 458,575 $ 404,950 $ 214,430 $ 619,380 $ 295,326 $ 155,933 $ 451,259 Standardized Measure (4) ($, in thousands) $ 169,260 $ 76,899 $ 246,159 $ 201,107 $ 142,574 $ 343,681 $ 148,894 $ 105,693 $ 254,587 (1) Reserves, revenues and present values reflect 96.97% of the corresponding amounts assigned to the operating partnership’s interests in the properties underlying the Net Profits Interests. (2) Total proved reserves include 36 mmcf, 218 mmcf, and 583 mmcf of proved undeveloped gas reserves attributable to the Royalty Properties at December 31, 2006, 2005 and 2004, respectively. (3) Total proved reserves include 0 mbbls, 2 mbbls, and 2 mbbls of proved undeveloped oil reserves attributable to the Royalty Properties at December 31, 2006, 2005 and 2004 respectively. Proved oil and gas reserves means the estimated quantities of crude oil, natural gas, and natural gas liquids which geological and engineering data demonstrate with reasonable certainty to be recoverable in future years from known reservoirs under existing economic and operating conditions, i.e., prices and costs as of the date the estimate is made. Prices include consideration of changes in existing prices provided only by contractual arrangements, but not on escalations based upon future conditions. (i) Reservoirs are considered proved if economic producibility is supported by either actual production or conclusive formation test. The area of a reservoir considered proved includes (a) that portion delineated by drilling and defined by gas-oil and/or oil-water contacts, if any; and (b) the immediately adjoining portions not yet drilled, but which can be reasonably judged as economically productive on the basis of available geological and engineering data. In the absence of information on fluid contacts, the lowest known structural occurrence of hydrocarbons controls the lower proved limit of the reservoir. 25 (4) We do not reflect a federal income tax provision since our partners include the income of our Partnership in their respective federal income tax returns. Table of Contents Index to Financial Statements (ii) Reserves which can be produced economically through application of improved recovery techniques (such as fluid injection) are included in the “proved” classification when successful testing by a pilot project, or the operation of an installed program in the reservoir, provides support for the engineering analysis on which the project or program was based. (iii) Estimates of proved reserves do not include the following: (a) oil that may become available from known reservoirs but is classified separately as “indicated additional reserves”; (b) crude oil, natural gas, and natural gas liquids, the recovery of which is subject to reasonable doubt because of uncertainty as to geology, reservoir characteristics, or economic factors; (c) crude oil, natural gas, and natural gas liquids, that may occur in undrilled prospects; and (d) crude oil, natural gas, and natural gas liquids, that may be recovered from oil shales, coal, gilsonite and other such sources. Title to Properties We believe we have satisfactory title to all of our assets. Record title to essentially all our assets has undergone the appropriate filings in the jurisdictions in which such assets are located. Title to property may be subject to encumbrances. We believe that none of such encumbrances should materially detract from the value of our properties or from our interest in these properties or should materially interfere with their use in the operation of our business. In January 2002, some individuals and an association called Rural Residents for Natural Gas Rights sued Dorchester Hugoton, Ltd., along with several other operators in Texas County, Oklahoma. The operating partnership now owns and operates the properties formerly owned by Dorchester Hugoton. These properties contribute a major portion of the Net Profits Interests amounts paid to the Partnership. The plaintiffs consist primarily of Texas County, Oklahoma residents who, in residences located on leases use natural gas from gas wells located on the same leases, at their own risk, free of cost. The plaintiffs seek declaration that their domestic gas use is not limited to stoves and inside lights and is not limited to a principal dwelling as provided in the oil and gas leases entered into in the 1930s to the 1950s. Plaintiffs’ claims against defendants include failure to prudently operate wells, violation of rights to free domestic gas, and fraud. Plaintiffs also seek certification of class action against defendants. On October 1, 2004, the plaintiffs severed claims against the operating partnership regarding royalty underpayments. The operating partnership believes plaintiffs’ claims, including severed claims, are completely without merit. Based upon past measurements of such domestic gas usage, the operating partnership believes the domestic gas damages sought by plaintiffs to be minimal. An adverse decision could reduce amounts the Partnership receives from the Net Profits Interests. The Partnership and the operating partnership are involved in other legal and/or administrative proceedings arising in the ordinary course of their businesses, none of which have predictable outcomes and none of which are believed to have any significant effect on financial position or operating results. No matters were submitted to a vote of unitholders during the fourth quarter of the year ended December 31, 2006. 26 ITEM 3. LEGAL PROCEEDINGS ITEM 4. SUBMISSION OF A MATTER TO A VOTE OF UNITHOLDERS Table of Contents Index to Financial Statements PART II Our common units began trading on the Nasdaq National Market (now the Nasdaq Global Market) on February 3, 2003. The following summarizes the high and low sales information for the common units for the period indicated. The information below reflects inter-dealer prices, without retail mark-up, mark-down or commission and may not necessarily represent actual transactions. As of December 31, 2006, there were 9,517 common unitholders. Beginning with the quarter ended March 31, 2003, as required by our partnership agreement, we distributed and will continue to distribute, on a quarterly basis, within 45 days of the end of the quarter, all of our available cash. Available cash generally means, all cash and cash equivalents on hand at the end of that quarter, less any amount of cash reserves that our general partner determines is necessary or appropriate to provide for the conduct of its business or to comply with applicable law or agreements or obligations to which we may be subject. Since our Partnership’s combination on January 31, 2003, unitholder cash distributions per common unit have been: Distributions beginning with the third quarter 2004 were paid on 28,240,431 units; previous distributions were paid on 27,040,431 units. Fourth quarter distributions are paid in February of the following calendar year to unitholders of record in January or February of such following year. The partnership agreement requires the next cash distribution to be paid by May 15, 2007. Please see “Fourth Quarter 2006 Distribution Indicated Price” discussion contained in “Item 7.—Management’s Discussion and Analysis of Financial Condition and Results of Operations —Liquidity and Capital Resources —Distributions” for production periods and cash receipts and weighted average prices corresponding to the fourth quarter 2006 distribution. 27 ITEM 5. MARKET FOR REGISTRANT’S COMMON EQUITY, RELATED UNITHOLDER MATTERS AND ISSUER PURCHASES OF EQUITY SECURITIES 2006 2005 High Low High Low First Quarter $ 29.00 $ 23.00 $ 24.82 $ 21.10 Second Quarter $ 28.25 $ 23.80 $ 24.50 $ 21.07 Third Quarter $ 29.30 $ 23.75 $ 30.72 $ 23.50 Fourth Quarter $ 26.70 $ 21.40 $ 30.59 $ 24.05 Per Unit Amount 2003 2004 2005 2006 First Quarter $ 0.206469 $ 0.415634 $ 0.481242 $ 0.729852 Second Quarter $ 0.458087 $ 0.415315 $ 0.514542 $ 0.778120 Third Quarter $ 0.422674 $ 0.476196 $ 0.577287 $ 0.516082 Fourth Quarter $ 0.391066 $ 0.426076 $ 0.805543 $ 0.478596 Table of Contents Index to Financial Statements Performance Graph The following graph compares the performance of our common units with the performance of the NASDAQ Market Index (the “NASDAQ Index”) and a peer group index from the first day of trading of our common units, February 3, 2003, through December 31, 2006. The graph assumes that at the beginning of the period, $100 was invested in each of (1) our common units, (2) the NASDAQ Index, and (3) the peer group, and that all distributions or dividends were reinvested. We do not believe that any published industry or line-of-business index accurately reflects our business. Accordingly, we have created a special peer group index consisting of companies whose royalty trust units are publicly traded on the New York Stock Exchange. Our peer group index includes the units of the following companies: Cross Timbers Royalty Trust, Mesa Royalty Trust, Sabine Royalty Trust, Permian Basin Royalty Trust, Hugoton Royalty Trust and the San Juan Basin Royalty Trust. 28 Table of Contents Index to Financial Statements Basis of Presentation The combination of Republic, Spinnaker and Dorchester Hugoton on January 31, 2003 was accounted for as a purchase and Dorchester Hugoton was designated as the accounting acquiror in connection with the combination. Prior to January 31, 2003, our Partnership had no combined operations. As a result, the following table sets forth a summary of historical selected financial and operating data for Dorchester Hugoton for 2002, and certain pro forma operating data assuming the combination occurred on January 1, 2002. As required, the data presented for fiscal year ended December 31, 2003 consists of 11 months of our Partnership’s results and January 2003 results for Dorchester Hugoton. The years ended December 31, 2004 through 2006 are exclusively our Partnership data. This table should be read in conjunction with the financial statements and related notes included elsewhere in this document. All of the historical data presented prior to 2003 has been derived from the audited financial statements of Dorchester Hugoton and does not contain any information with respect to Republic or Spinnaker, or our Partnership, pre-combination. ITEM 6. SELECTED FINANCIAL DATA Fiscal Year Ended December 31, (in thousands, except per unit data) 2003 2002 2006 2005 2004 2003 2002 Pro Forma Historic Total operating revenues $ 51,247 $ 37,547 $ 74,927 $ 79,832 $ 57,028 $ 49,358 $ 18,738 Depreciation, depletion and amortization 25,390 25,844 18,470 20,858 20,795 23,639 2,130 Impairment 43,804 — — — — 43,804 —Net earnings (loss) (26,976 ) 6,524 50,210 52,775 30,076 (26,827 ) 12,963 Net earnings (loss) per unit (0.97 ) 0.24 1.72 1.82 1.07 (1.02 ) 1.19 Cash distributions (1) 82,295 58,028 47,701 50,798 8,791 Cash distributions per unit (1) 2.83 2.00 1.70 1.94 0.81 Total assets 168,429 200,830 206,173 198,951 40,103 Total liabilities 629 945 1,035 512 1,233 Partners’ equity 167,800 199,885 205,138 198,439 38,870 Critical Accounting Policies We utilize the full cost method of accounting for costs related to our oil and gas properties. Under this method, all such costs are capitalized and amortized on an aggregate basis over the estimated lives of the properties using the units-of-production method. These capitalized costs are subject to a ceiling test however, which limits such pooled costs to the aggregate of the present value of future net revenues attributable to proved oil and gas reserves discounted at 10% plus the lower of cost or market value of unproved properties. Our Partnership did not assign any book or market value to unproved properties, including non-producing royalty, mineral and leasehold interests. The full cost ceiling is evaluated at the end of each quarter and when events indicate possible impairment. For 2003, our unamortized costs of oil and gas properties exceeded the ceiling test. As a result, in 2003, our Partnership recorded full cost write-downs of $43,804,000. No additional impairments have been recorded since the quarter ended September 30, 2003. 29 (1) Because of depletion (which is usually higher in the early years of production), a portion of every distribution of revenues from properties represents a return of a limited partner’s original investment. Until a limited partner receives cash distributions equal to his original investment, in certain circumstances, 100% of such distributions may be deemed to be a return of capital. Cash Distributions for 2003 include Dorchester Hugoton’s liquidating distribution declared in January 2003. Cash distributions for 2003 through 2006 exclude the fourth quarter distribution declared in January 2004, 2005, 2006 and 2007 and paid in February 2004, 2005, 2006 and 2007. Cash distributions for 2004, 2005 and 2006 include the 2003, 2004 and 2005, respectively, fourth quarter distributions. ITEM 7. MANAGEMENT’S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS Table of Contents Index to Financial Statements The discounted present value of our proved oil and gas reserves is a major component of the ceiling calculation and requires many subjective judgments. Estimates of reserves are forecasts based on engineering and geological analyses. Different reserve engineers may reach different conclusions as to estimated quantities of natural gas or crude oil reserves based on the same information. Our reserve estimates are prepared by independent consultants. The passage of time provides more qualitative information regarding reserve estimates, and revisions are made to prior estimates based on updated information. However, there can be no assurance that more significant revisions will not be necessary in the future. Significant downward revisions could result in an impairment representing a non-cash charge to earnings. In addition to the impact on calculation of the ceiling test, estimates of proved reserves are also a major component of the calculation of depletion. While the quantities of proved reserves require substantial judgment, the associated prices of oil and gas reserves that are included in the discounted present value of our reserves are objectively determined. The ceiling test calculation requires use of prices and costs in effect as of the last day of the accounting period, which are generally held constant for the life of the properties. As a result, the present value is not necessarily an indication of the fair value of the reserves. Oil and gas prices have historically been volatile and the prevailing prices at any given time may not reflect our Partnership’s or the industry’s forecast of future prices. The preparation of financial statements in conformity with accounting principles generally accepted in the United States of America requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. For example, estimates of uncollected revenues and unpaid expenses from royalties and Net Profits Interests in properties operated by non-affiliated entities are particularly subjective due to inability to gain accurate and timely information. Therefore, actual results could differ from those estimates. Please see “Item 1. Business—Customers and Pricing” and “Item 2. Properties—Royalty Properties” for additional discussion. New Accounting Standards None. Contractual Obligations Our office lease in Dallas, Texas comprises our contractual obligations. 30 Payments due by Period Contractual Obligations Total Less than 1 year 1-3 years 3-5 years More than 5 years Operating Lease Obligations $ 1,934,000 $ 213,000 $ 441,000 $ 465,000 $ 815,000 Table of Contents Index to Financial Statements Results of Operations Normally, our period-to-period changes in net earnings and cash flows from operating activities are principally determined by changes in oil and natural gas sales volumes and prices, and to a lesser extent, by capital expenditures deducted under the Net Profits Interests calculation. Our portion of oil and gas sales volumes and weighted average sales prices are shown in the following table. Years Ended December 31, 2006 2005 2004 Accrual Basis Sales Volumes: Royalty Properties Gas Sales (mmcf) 3,949 3,890 3,469 Royalty Properties Oil Sales (mbbls) 328 340 299 Net Profits Interests Gas Sales (mmcf) 4,521 4,873 5,351 Net Profits Interests Oil Sales (mbbls) 15 11 8 Accrual Basis Weighted Averages Sales Price: Royalty Properties Gas Sales ($/mcf) $ 6.46 $ 7.43 $ 5.56 Royalty Properties Oil Sales ($/bbl) $ 59.89 $ 51.07 $ 38.44 Net Profits Interests Gas Sales ($/mcf) $ 6.28 $ 7.82 $ 5.67 Net Profits Interests Oil Sales ($/bbl) $ 52.68 $ 50.58 $ 37.51 Accrual Basis Production costs Deducted under the Net Profits Interests ($/mcfe) (1) $ 1.57 $ 1.43 $ 1.20 Comparison of the twelve-month periods ended December 31, 2006, 2005 and 2004 Royalty Properties oil sales volumes increased 13.7% from 299 mbbls during 2004 to 340 mbbls during 2005 and then decreased 3.5% to 328 mbbls during 2006. Royalty Properties gas sales volumes increased 12.1% from 3,469 mmcf during 2004 to 3,890 mmcf during 2005 and then increased 1.5% to 3,949 mmcf during 2006. The changes in Royalty Property oil and gas sales volumes are attributable to new wells drilled in late 2005 and 2006, offset by natural reservoir declines. See discussion in “Item 2. Properties—Royalty Properties—Drilling Activity”. Net Profits Interests Properties oil sales volumes increased 37.5% from 8 mbbls during 2004 to 11 mbbls during 2005, and then increased 36.4% to 15 mbbls during 2006 primarily as a result of improved production in North Dakota properties. Net Profits Interests Properties gas sales volumes decreased 8.9% from 5,351 mmcf during 2004 to 4,873 mmcf during 2005 and subsequently decreased 7.2% to 4,521 mmcf in 2006 principally as a result of natural reservoir depletion in the Guymon-Hugoton field in Oklahoma. Weighted average oil sales prices attributable to the Royalty Properties increased 32.9% from $38.44 per bbl in 2004 to $51.07 per bbl in 2005 and subsequently increased 17.3% to $59.89 per bbl in 2006. Royalty Properties weighted average gas sales prices increased 33.6% from $5.56 per mcf during 2004 to $7.43 per mcf during 2005 and then decreased 13.1% to $6.46 per mcf during 2006. Weighted average Net Profits Interests Properties gas sales prices increased 37.9% from $5.67 per mcf during 2004 to $7.82 per mcf during 2005 and then decreased 19.7% to $6.28 per mcf in 2006. Net Profits Interests Properties weighted average oil sales prices increased 34.8% from $37.51 per bbl during 2004 to $50.58 per bbl during 2005 followed by an increase of 4.2% to $52.68 per bbl in 2006. All such changes resulted from changing market conditions. Our 2006 net operating revenues decreased 6.1% from $79,832,000 during 2005 to $74,927,000 primarily as a result of decreased natural gas sales prices. Our 2005 net operating revenues increased 40% from $57,028,000 during 2004 to $79,832,000 primarily as a result of increased oil and natural gas sales prices. 31 (1) Provided to assist in determination of revenues; applies only to Net Profit Interest sales volumes prices. Table of Contents Index to Financial Statements General and administrative costs increased slightly from $2,892,000 in 2005 to $3,058,000 in 2006. Those same costs decreased 20.2% from $3,626,000 in 2004 to $2,892,000 in 2005 primarily due to the completion of the Partnership’s office relocation in 2004 and increased costs related to the acquisition of properties in late 2004. Depletion and amortization was $20,795,000 in 2004 compared to $20,858,000 in 2005 compared to $18,470,000 in 2006 primarily as a result of a lower depletable base due to the effects of previous depletion and upward revisions in oil and gas reserve estimates. Cash flow from operations and cash distributions to unitholders are not affected by depletion, depreciation and amortization. Net cash provided by operating activities increased 42.1% from $48,629,000 during 2004 to $69,112,000 during 2005 and increased 5.3% to $72,783,000 during 2006 due primarily to the effects of increased oil and natural gas sales prices from 2004 to 2005 and increased lease bonus from 2005 to 2006. Texas Margin Tax The Texas Legislature recently passed H.B. 3 which is a new tax system, commonly referred to as the Texas margin tax. The Texas margin tax applies to corporations and limited liability companies, general and limited partnerships (unless otherwise exempt), limited liability partnerships, trusts (unless otherwise exempt), business trusts, business associations, professional associations, joint stock companies, holding companies, and joint ventures. The effective date of the Texas margin tax is January 1, 2008, but the tax generally will be imposed on gross revenues generated in 2007 and thereafter. Limited partnerships that receive at least 90% of their gross income from designated passive sources, including royalties from mineral properties and other non-operated mineral interest income, and do not receive more than 10% of their income from operating an active trade or business, are generally exempt from the Texas margin tax as “passive entities.” Our Partnership should meet the requirements for being considered a “passive entity” for Texas margin tax purposes and, therefore, it should be exempt from the Texas margin tax. If exempt from tax at the Partnership level as a passive entity, each unitholder that is considered a taxable entity under the Texas margin tax would generally be required to include its Texas portion of Partnership revenues in its own Texas margin tax computation. Each unitholder is urged to consult his own tax advisor regarding the requirements for filing state income, franchise and Texas margin tax returns. Liquidity and Capital Resources Capital Resources Our primary sources of capital are our cash flow from the Net Profits Interests and the Royalty Properties. Our only cash requirements are the distributions to our unitholders, the payment of oil and gas production and property taxes not otherwise deducted from gross production revenues and general and administrative expenses incurred on our behalf and allocated in accordance with our partnership agreement. Since the distributions to our unitholders are, by definition, determined after the payment of all expenses actually paid by us, the only cash requirements that may create liquidity concerns for us are the payments of expenses. Since most of these expenses vary directly with oil and natural gas prices and sales volumes, we anticipate that sufficient funds will be available at all times for payment of these expenses. See “Item 5. Market for Registrant’s Common Equity, Related Unitholder Matters and Issuer Purchases of Equity Securities” for the amounts and dates of cash distributions to our unitholders. We are not directly liable for the payment of any exploration, development or production costs. We do not have any transactions, arrangements or other relationships that could materially affect our liquidity or the availability of capital resources. 32 Table of Contents Index to Financial Statements Pursuant to the terms of our partnership agreement, we cannot incur indebtedness, other than trade payables, (i) in excess of $50,000 in the aggregate at any given time or (ii) which would constitute “acquisition indebtedness” (as defined in Section 514 of the Internal Revenue Code of 1986, as amended). Off-Balance Sheet Arrangements We have no significant off-balance sheet arrangements that have or are reasonably likely to have a current or future effect on our financial condition, changes in financial condition, revenues or expenses, results of operations, liquidity, capital expenditures or capital resources that is material to unitholders. Expenses and Capital Expenditures During February 2007 the operating partnership drilled one replacement Guymon-Hugoton well and one Council Grove formation well, both in Oklahoma. The Guymon-Hugoton well is awaiting completion operations. The Council Grove well was a dry hole costing approximately $280,000. Final cost of the replacement Guymon-Hugoton well is expected to be $450,000. During 2007, depending upon rig availability, the operating partnership anticipates drilling one additional well in the Oklahoma Council Grove formation. The operating partnership does not otherwise currently anticipate drilling additional wells as a working interest owner/operator in the Oklahoma or Kansas properties. Successful activities by others or other developments could prompt a reevaluation of this position. Present drilling and completion costs are estimated at $350,000 - $450,000 per well. Such activities by the operating partnership could influence the amount we receive from the Net Profits Interests. During the 2006 fourth quarter, the operating partnership deepened one Oklahoma well. Results are awaiting clean-out operations. Costs are expected to total $108,000. The operating partnership anticipates continuing fracture treating in its Oklahoma properties but is unable to predict the cost as a specific engineering study is required for each fracture treatment. Previous fracture treatments in these properties have cost between $50,000 and $80,000 per well. They did not require casing repairs. Such activities by the operating partnership could influence the amount we receive from the Net Profits Interests. The operating partnership owns and operates the wells, pipelines and gas compression and dehydration facilities located in Kansas and Oklahoma. The operating partnership anticipates gradual increases in expenses as repairs to these facilities become more frequent, and anticipates gradual increases in field operating expenses as reservoir pressure declines. The operating partnership does not anticipate incurring significant expense to replace these facilities at this time. These capital and operating costs are reflected in the Net Profits Interests payments we receive from the operating partnership. In 1998, Oklahoma regulations removed production quantity restrictions in the Guymon-Hugoton field, and did not address efforts by third parties to persuade Oklahoma to permit infill drilling in the Guymon-Hugoton field. Infill drilling could require considerable capital expenditures. The outcome and the cost of such activities are unpredictable and could influence the amount we receive from the Net Profits Interests. The operating partnership believes it now has sufficient field compression and permits for vacuum operation for the foreseeable future. Liquidity and Working Capital Year-end cash and cash equivalents totaled $13,927,000 for 2006, $23,389,000 for 2005, and $12,365,000 for 2004. 33 Table of Contents Index to Financial Statements Distributions Distributions to limited partners and general partners related to cash receipts for the period from October 2005 through December 2006 were as follows: In general, the limited partners are allocated 96% of the Royalty Properties Net Receipts and 99% of our Net Profits Interest Receipts. Net Profits Interests We receive monthly payments from the operating partnership equal to 96.97% of the net proceeds actually realized by the operating partnership from the properties underlying the Net Profits Interests. The operating partnership retains the 3.03% balance of these net proceeds. Net proceeds generally reflect gross proceeds attributable to oil and natural gas production actually received during the month less production costs actually paid during the same month. Production costs generally reflect drilling, completion, operating and general and administrative costs and exclude depletion, amortization and other non-cash costs. The operating partnership made Net Profits Interests Payments to us totaling $30,187,000 during October 2005 through September 2006, which payments reflected 96.97% of total net proceeds of $31,130,000 realized from September 2005 through August 2006. Net proceeds realized by the operating partnership during September through November 2006 were reflected in Net Profits Interests payments made during October through December 2006. These payments were included in the fourth quarter distribution paid in early 2007 and are excluded from this 2006 analysis. Royalty Properties Revenues from the Royalty Properties are typically paid to us with proportionate severance (production) taxes deducted and remitted by others. Additionally, we generally pay ad valorem taxes, general and administrative costs, and marketing and associated costs since royalties and lease bonuses generally do not otherwise bear operating or similar costs. After deduction of the above described costs including cash reserves, our net cash receipts from the Royalty Properties during the period October 2005 through September 2006 were $52,108,000: $50,024,000 (96%) of which was distributed to the limited partners and $2,084,000 (4%) of which was distributed to the general partner. Proceeds received by us from the Royalty Properties during the period October through December 2006 became part of the fourth quarter distribution paid in early 2007, which is excluded from this 2006 analysis. 34 Year Quarter Record Date Payment Date Per Unit Amount Limited Partners General Partners $ In Thousands 2005 4th January 30, 2006 February 9, 2006 $ 0.805543 $ 22,749 $ 633 2006 1st May 1, 2006 May 11, 2006 $ 0.729852 20,611 574 2006 2nd July 24, 2006 August 3, 2006 $ 0.778120 21,975 730 2006 3rd October 23, 2006 November 3, 2006 $ 0.516082 14,574 449 Total distributions paid in 2006 $ 79,909 $ 2,386 2006 4th January 30, 2007 February 9, 2007 $ 0.478596 $ 13,516 $ 405 Table of Contents Index to Financial Statements Distribution Determinations The actual calculation of distributions is performed each calendar quarter in accordance with our partnership agreement. The following calculation covering the period October 2005 through September 2006 demonstrates the method. In summary, our limited partners received 96% and our general partner received 4% of the net cash generated by our activities and those of the operating partnership during this period. Due to these fixed percentages, our general partner does not have any incentive distribution rights or other right or arrangement which will increase its percentage share of net cash generated by our activities or those of the operating partnership. During the period October 2005 through September 2006, our Partnership’s quarterly distribution payments to limited partners were based on all of its available cash. Our Partnership’s only significant cash reserves that influenced quarterly payments were $1,090,000 for ad valorem taxes. Additionally, certain production costs under the Net Profits Interests calculation and a small portion of management expense reimbursements include amounts for which funds were set aside monthly to enable payment when due. Examples are pension contributions and payroll taxes. These amounts generally are not held for periods over one year. Fourth Quarter 2006 Distribution Indicated Price In an effort to provide the reader with information concerning prices of oil and gas sales that correspond to our quarterly distributions, management calculates the weighted average price by dividing gross revenues received by the net volumes of the corresponding product without regard to the timing of the production to which such sales may be attributable. This “indicated price” does not necessarily reflect the contractual terms for such sales and may be affected by transportation costs, location differentials, and quality and gravity adjustments. While the relationship between the Partnership’s cash receipts and the timing of the production of oil and gas may be described generally, actual cash receipts may be materially impacted by purchasers’ release of suspended funds and by prior period adjustments. Cash receipts attributable to the Partnership’s Net Profits Interests during the 2006 fourth quarter totaled $5,069,000. These receipts generally reflect oil and gas sales from the properties underlying the Net Profits Interests during August through October 2006. The weighted average indicated prices for oil and gas sales during the 2006 fourth quarter attributable to the Net Profits Interests were $57.01/bbl and $5.60/mcf, respectively. Cash receipts attributable to the Partnership’s Royalty Properties during the 2006 fourth quarter totaled $9,481,000. These receipts generally reflect oil sales during September through November 2006 and gas sales during August through October 2006. The weighted average indicated prices for oil and gas sales during the 2006 fourth quarter attributable to the Royalty Properties were $57.68/bbl and $5.83/mcf, respectively. 35 $ In Thousands Limited Partners General Partner 4% of Net Cash Receipts from Royalty Properties $ — $ 2,084 96% of Net Cash Receipts from Royalty Properties 50,024 —1% of Net Profits Interest Paid to our Partnership — 302 99% of Net Profits Interests Paid to our Partnership 29,885 — Total Distributions $ 79,909 $ 2,386 Operating Partnership Share (3.03% of Net Proceeds) — 943 Total General Partner Share $ 3,329 % of Total 96% 4% Table of Contents Index to Financial Statements General and Administrative Costs In accordance with our partnership agreement, we bear all general and administrative and other overhead expenses subject to certain limitations. We reimburse our general partner for certain allocable costs, including rent, wages, salaries and employee benefit plans. This reimbursement is limited to an amount equal to the sum of 5% of our distributions plus certain costs previously paid. Through December 31, 2006, the limitation was substantially in excess of the reimbursement amounts actually paid or accrued. Quantitative and Qualitative Disclosures About Market Risk The following information provides quantitative and qualitative information about our potential exposures to market risk. The term “market risk” refers to the risk of loss arising from adverse changes in oil and natural gas prices, interest rates and currency exchange rates. The disclosures are not meant to be precise indicators of expected future losses, but rather indicators of reasonably possible losses. Market Risk Related to Oil and Natural Gas Prices Essentially all of our assets and sources of income are from the Net Profits Interests and the Royalty Properties, which generally entitle us to receive a share of the proceeds from oil and natural gas production on those properties. Consequently, we are subject to market risk from fluctuations in oil and natural gas prices. Pricing for oil and natural gas production has been volatile and unpredictable for several years. We do not anticipate entering into financial hedging activities intended to reduce our exposure to oil and natural gas price fluctuations. Absence of Interest Rate and Currency Exchange Rate Risk We do not anticipate having a credit facility or incurring any debt, other than trade debt. Therefore, we do not expect interest rate risk to be material to us. We do not anticipate engaging in transactions in foreign currencies which could expose us to foreign currency related market risk. The financial statements are set forth herein commencing on page F-1. None. Evaluation of Disclosure Controls and Procedures As of the end of the period covered by this report, our Partnership’s principal executive officer and principal financial officer, carried out an evaluation of the effectiveness of our disclosure controls and procedures as defined in rule 13a-15(e) promulgated under the Securities Exchange Act of 1934, as amended (the Exchange Act). Based on their evaluation, they have concluded that our Partnership’s disclosure controls and procedures effectively ensure that the information required to be disclosed in the reports the Partnership files with the SEC is recorded, processed, summarized and reported, within the time periods specified by the SEC. Management’s Annual Report on Internal Control Over Financial Reporting Management acknowledges its responsibility for establishing and maintaining adequate internal control over financial reporting in accordance with Rule 13a-15(f) promulgated under the Exchange Act. Management has 36 ITEM 7A. QUANTITATIVE AND QUALITATIVE DISCLOSURES ABOUT MARKET RISK ITEM 8. FINANCIAL STATEMENTS AND SUPPLEMENTARY DATA ITEM 9. CHANGES IN AND DISAGREEMENTS WITH ACCOUNTANTS ON ACCOUNTING AND FINANCIAL DISCLOSURE ITEM 9A. CONTROLS AND PROCEDURES Table of Contents Index to Financial Statements also evaluated the effectiveness of its internal control over external financial reporting in accordance with generally accepted accounting principles within the guidelines of the COSO framework. Based on the results of this evaluation, Management has determined that the Partnership’s internal control over financial reporting was effective as of December 31, 2006. The Partnership’s external auditor, Grant Thornton LLP, has audited the Partnership’s financial statements and has issued an attestation report on Management’s assessment of the Partnership’s internal control over financial reporting. This report is included on page F-2. Changes in Internal Controls Effective July 1, 2006, the data entry portion of our royalty revenue processing activities was outsourced under an agreement with a third party service provider. Under the agreement, the third party service provider processes royalty revenue, where in the past our general partner performed such activity. In connection with the outsourcing, the internal controls over financial reporting with respect to our royalty revenue processing substantially changed. We assessed the effectiveness of the internal controls over financial reporting related to our royalty revenue processing, as part of our overall assessment of internal controls over financial reporting, and found such controls, both before and after the outsourcing of our royalty revenue processing, to be effective. None. 37 ITEM 9B. OTHER INFORMATION Table of Contents Index to Financial Statements PART III The information required by this item is incorporated herein by reference to the 2007 Proxy Statement, which will be filed with the Commission not later than 120 days subsequent to December 31, 2006. The information required by this item is incorporated herein by reference to the 2007 Proxy Statement, which will be filed with the Commission not later than 120 days subsequent to December 31, 2006. The information required by this item is incorporated herein by reference to the 2007 Proxy Statement, which will be filed with the Commission not later than 120 days subsequent to December 31, 2006. The information required by this item is incorporated herein by reference to the 2007 Proxy Statement, which will be filed with the Commission not later than 120 days subsequent to December 31, 2006. The information required by this item is incorporated herein by reference to the 2007 Proxy Statement, which will be filed with the Commission not later than 120 days subsequent to December 31, 2006. 38 ITEM 10. DIRECTORS AND EXECUTIVE OFFICERS AND CORPORATE GOVERNANCE ITEM 11. EXECUTIVE COMPENSATION ITEM 12. SECURITY OWNERSHIP OF CERTAIN BENEFICIAL OWNERS AND MANAGEMENT AND RELATED UNITHOLDER MATTERS ITEM 13. CERTAIN RELATIONSHIPS AND RELATED TRANSACTIONS; AND DIRECTOR INDEPENDENCE ITEM 14. PRINCIPAL ACCOUNTING FEES AND SERVICES Table of Contents Index to Financial Statements PART IV 39 ITEM 15. EXHIBITS, FINANCIAL STATEMENT SCHEDULES (a) Financial Statements and Schedules (1) See the Index to Financial Statements on page F-1. (2) No schedules are required. (3) Exhibits. Number Description 3.1 Certificate of Limited Partnership of Dorchester Minerals, L.P. (incorporated by reference to Exhibit 3.1 to Dorchester Minerals’ Registration Statement on Form S-4, Registration Number 333-88282) 3.2 Amended and Restated Agreement of Limited Partnership of Dorchester Minerals, L.P. (incorporated by reference to Exhibit 3.2 to Dorchester Minerals’ Report on Form 10-K for the year ended December 31, 2002) 3.3 Certificate of Limited Partnership of Dorchester Minerals Management LP (incorporated by reference to Exhibit 3.4 to Dorchester Minerals’ Registration Statement on Form S-4, Registration Number 333-88282) 3.4 Amended and Restated Agreement of Limited Partnership of Dorchester Minerals Management LP (incorporated by reference to Exhibit 3.4 to Dorchester Minerals’ Report on Form 10-K for the year ended December 31, 2002) 3.5 Certificate of Formation of Dorchester Minerals Management GP LLC (incorporated by reference to Exhibit 3.7 to Dorchester Minerals’ Registration Statement on Form S-4, Registration Number 333-88282) 3.6 Amended and Restated Limited Liability Company Agreement of Dorchester Minerals Management GP LLC (incorporated by reference to Exhibit 3.6 to Dorchester Minerals’ Report on Form 10-K for the year ended December 31, 2002) 3.7 Certificate of Formation of Dorchester Minerals Operating GP LLC (incorporated by reference to Exhibit 3.10 to Dorchester Minerals’ Registration Statement on Form S-4, Registration Number 333-88282) 3.8 Limited Liability Company Agreement of Dorchester Minerals Operating GP LLC (incorporated by reference to Exhibit 3.11 to Dorchester Minerals’ Registration Statement on Form S-4, Registration Number 333-88282) 3.9 Certificate of Limited Partnership of Dorchester Minerals Operating LP (incorporated by reference to Exhibit 3.12 to Dorchester Minerals’ Registration Statement on Form S-4, Registration Number 333-88282) 3.10 Amended and Restated Agreement of Limited Partnership of Dorchester Minerals Operating LP (incorporated by reference to Exhibit 3.10 to Dorchester Minerals’ Report on Form 10-K for the year ended December 31, 2002) 3.11 Certificate of Limited Partnership of Dorchester Minerals Oklahoma LP (incorporated by reference to Exhibit 3.11 to Dorchester Minerals’ Report on Form 10-K for the year ended December 31, 2002) 3.12 Agreement of Limited Partnership of Dorchester Minerals Oklahoma LP (incorporated by reference to Exhibit 3.12 to Dorchester Minerals’ Report on Form 10-K for the year ended December 31, 2002) 3.13 Certificate of Incorporation of Dorchester Minerals Oklahoma GP, Inc. (incorporated by reference to Exhibit 3.13 to Dorchester Minerals’ Report on Form 10-K for the year ended December 31, 2002) 3.14 Bylaws of Dorchester Minerals Oklahoma GP, Inc. (incorporated by reference to Exhibit 3.14 to Dorchester Minerals’ Report on Form 10-K for the year ended December 31, 2002) Table of Contents Index to Financial Statements 40 Number Description 3.15 Certificate of Limited Partnership of Dorchester Minerals Acquisition LP (incorporated by reference to Exhibit 3.15 to Dorchester Minerals’ Report on Form 10-K for the year ended December 31, 2004) 3.16 Agreement of Limited Partnership of Dorchester Minerals Acquisition LP (incorporated by reference to Exhibit 3.16 to Dorchester Minerals’ Report on Form 10-Q for the quarter ended September 30, 2004) 3.17 Certificate of Incorporation of Dorchester Minerals Acquisition GP, Inc. (incorporated by reference to Exhibit 3.17 to Dorchester Minerals’ Report on Form 10-Q for the quarter ended September 30, 2004) 3.18 Bylaws of Dorchester Minerals Acquisition GP, Inc. (incorporated by reference to Exhibit 3.18 to Dorchester Minerals’ Report on form 10-Q for the quarter ended September 30, 2004) 10.1 Amended and Restated Business Opportunities Agreement dated as of December 13, 2001 by and between the Registrant, the General Partner, Dorchester Minerals Management GP LLC, SAM Partners, Ltd., Vaughn Petroleum, Ltd., Smith Allen Oil & Gas, Inc., P.A. Peak, Inc., James E. Raley, Inc., and certain other parties (incorporated by reference to Exhibit 10.1 to Dorchester Minerals’ Report on Form 10-K for the year ended December 31, 2002) 10.2 Transfer Restriction Agreement (incorporated by reference to Exhibit 10.2 to Dorchester Minerals’ Report on Form 10-K for the year ended December 31, 2002) 10.3 Registration Rights Agreement (incorporated by reference to Exhibit 10.3 to Dorchester Minerals’ Report on Form 10-K for the year ended December 31, 2002) 10.4 Lock-Up Agreement by William Casey McManemin (incorporated by reference to Exhibit 10.4 to Dorchester Minerals’ Report on Form 10-K for the year ended December 31, 2002) 21.1* Subsidiaries of the Registrant 23.1* Consent of Grant Thornton LLP 23.2* Consent of Calhoun, Blair & Associates 23.3* Consent of Huddleston & Co., Inc. 31.1* Certification of Chief Executive Officer of our Partnership pursuant to Rule 13a-14(a) of the Securities Exchange Act of 1934 31.2* Certification of Chief Financial Officer of our Partnership pursuant to Rule 13a-14(a) of the Securities Exchange Act of 1934 32.1* Certification of Chief Executive Officer of our Partnership pursuant to 18 U.S.C. Sec. 1350 32.2* Certification of Chief Financial Officer of our Partnership pursuant to 18 U.S.C. Sec. 1350 * Filed herewith Table of Contents Index to Financial Statements GLOSSARY OF CERTAIN OIL AND GAS TERMS The definitions set forth below shall apply to the indicated terms as used in this document. All volumes of natural gas referred to herein are stated at the legal pressure base of the state or area where the reserves exist and at 60 degrees Fahrenheit and in most instances are rounded to the nearest major multiple. “bbl” means a standard barrel of 42 U.S. gallons and represents the basic unit for measuring the production of crude oil, natural gas liquids and condensate. “bcf” means one billion cubic feet under prescribed conditions of pressure and temperature and represents a unit for measuring the production of natural gas. “Depletion” means (a) the volume of hydrocarbons extracted from a formation over a given period of time, (b) the rate of hydrocarbon extraction over a given period of time expressed as a percentage of the reserves existing at the beginning of such period, or (c) the amount of cost basis at the beginning of a period attributable to the volume of hydrocarbons extracted during such period. “Division order” means a document to protect lessees and purchasers of production, in which all parties who may have a claim to the proceeds of the sale of production agree upon how the proceeds are to be divided. “Enhanced recovery” means the process or combination of processes applied to a formation to extract hydrocarbons in addition to those that would be produced utilizing the natural energy existing in that formation. Examples of enhanced recovery include water flooding and carbon dioxide (CO2) injection. “Estimated Future Net Revenues” (also referred to as “estimated future net cash flow”) means the result of applying current prices of oil and natural gas to estimated future production from oil and natural gas proved reserves, reduced by estimated future expenditures, based on current costs to be incurred, in developing and producing the proved reserves, excluding overhead. “Formation” means a distinct geologic interval, sometimes referred to as the strata, which has characteristics (such as permeability, porosity and hydrocarbon saturations) which distinguish it from surrounding intervals. “Gross acre” means the number of surface acres in which a working interest is owned. “Gross well” means a well in which a working interest is owned. “Lease bonus” means the initial cash payment made to a lessor by a lessee in consideration for the execution and conveyance of the lease. “Leasehold” means an acre in which a working interest is owned. “Lessee” means the owner of a lease of a mineral interest in a tract of land. “Lessor” means the owner of the mineral interest who grants a lease of his interest in a tract of land to a third party, referred to as the lessee. “Mineral interest” means the interest in the minerals beneath the surface of a tract of land. A mineral interest may be severed from the ownership of the surface of the tract. Ownership of a mineral interest generally involves four incidents of ownership: (1) the right to use the surface; (2) the right to incur costs and retain profits, also called the right to develop; (3) the right to transfer all or a portion of the mineral interest; and (4) the right to retain lease benefits, including bonuses and delay rentals. “mcf” means one thousand cubic feet under prescribed conditions of pressure and temperature and represents the basic unit for measuring the production of natural gas. 41 Table of Contents Index to Financial Statements “mbbls” means one thousand standard barrels of 42 U.S. gallons and represents the basic unit for measuring the production of crude oil, natural gas liquids and condensate. “mmcf” means one million cubic feet under prescribed conditions of pressure and temperature and represents the basic unit for measuring the production of natural gas. “Net acre” means the product determined by multiplying “gross” acres by the interest in such acres. “Net well” means the product determined by multiplying “gross” oil and natural gas wells by the interest in such wells. “Net profits interest” means a non-operating interest that creates a share in gross production from another (operating or non-operating) interest in oil and natural gas properties. The share is determined by net profits from the sale of production and customarily provides for the deduction of capital and operating costs from the proceeds of the sale of production. The owner of a net profits interest is customarily liable for the payment of capital and operating costs only to the extent that revenue is sufficient to pay such costs but not otherwise. “Operator” means the individual or company responsible for the exploration, development, and production of an oil or natural gas well or lease. “Overriding royalty interest” means a royalty interest created or reserved from another (operating or non-operating) interest in oil and natural gas properties. Its term extends for the same term as the interest from which it is created. “Proved developed reserves” means reserves that can be expected to be recovered through existing wells with existing equipment and operating methods. Additional oil and gas expected to be obtained through the application of fluid injection or other improved recovery techniques for supplementing the natural forces and mechanisms of primary recovery should be included as “proved developed reserves” only after testing by a pilot project or after the operation of an installed program has confirmed through production response that increased recovery will be achieved. “Proved reserves” or “Proved oil and gas reserves” means the estimated quantities of crude oil, natural gas, and natural gas liquids which geological and engineering data demonstrate with reasonable certainty to be recoverable in future years from known reservoirs under existing economic and operating conditions, i.e., prices and costs as of the date the estimate is made. Prices include consideration of changes in existing prices provided only by contractual arrangements, but not on escalations based upon future conditions. (i) Reservoirs are considered proved if economic producibility is supported by either actual production or conclusive formation test. The area of a reservoir considered proved includes (a) that portion delineated by drilling and defined by gas-oil and/or oil-water contacts, if any; and (b) the immediately adjoining portions not yet drilled, but which can be reasonably judged as economically productive on the basis of available geological and engineering data. In the absence of information on fluid contacts, the lowest known structural occurrence of hydrocarbons controls the lower proved limit of the reservoir. (ii) Reserves which can be produced economically through application of improved recovery techniques (such as fluid injection) are included in the “proved” classification when successful testing by a pilot project, or the operation of an installed program in the reservoir, provides support for the engineering analysis on which the project or program was based. (iii) Estimates of proved reserves do not include the following: (a) oil that may become available from known reservoirs but is classified separately as “indicated additional reserves”; (b) crude oil, natural gas, and natural gas liquids, the recovery of which is subject to reasonable doubt because of uncertainty as to geology, reservoir characteristics, or economic factors; (c) crude oil, natural gas, and natural gas liquids, that 42 Table of Contents Index to Financial Statements may occur in undrilled prospects; and (d) crude oil, natural gas, and natural gas liquids, that may be recovered from oil shales, coal, gilsonite and other such sources. “Proved undeveloped reserves” means proved reserves that are expected to be recovered from new wells on undrilled acreage, or from existing wells where a relatively major expenditure is required for recompletion. “Royalty” means an interest in an oil and gas lease that gives the owner of the interest the right to receive a portion of the production from the leased acreage (or of the proceeds of the sale thereof), but generally does not require the owner to pay any portion of the costs of drilling or operating the wells on the leased acreage. “Severance tax” means an amount of tax, surcharge or levy recovered by governmental agencies from the gross proceeds of oil and natural gas sales. Production tax may be determined as a percentage of proceeds or as a specific amount per volumetric unit of sales. Severance tax is usually withheld from the gross proceeds of oil and natural gas sales by the first purchaser (e.g. pipeline or refinery) of production. “Standardized measure of discounted future net cash flows” (also referred to as “standardized measure”) means the pretax present value of estimated future net revenues to be generated from the production of proved reserves calculated in accordance with SEC guidelines, net of estimated production and future development costs, using prices and costs as of the date of estimation without future escalation, without giving effect to non-property related expenses such as general and administrative expenses, debt service and depreciation, depletion and amortization, and discounted using an annual discount rate of 10%. “Test Rate” means a daily volume of oil, gas or condensate at which a well produced to a pipeline or tank battery within that well’s first month of production based on information obtained from public sources or from the operator. “Undeveloped acreage” means lease acreage on which wells have not been drilled or completed to a point that would permit the production of commercial quantities of oil and natural gas regardless of whether such acreage contains proved reserves. “Unitization” means the process of combining mineral interests or leases thereof in separate tracts of land into a single entity for administrative, operating or ownership purposes. Unitization is sometimes called “pooling” or “communitization” and may be voluntary or involuntary. “Working interest” (also referred to as an “operating interest”) means a real property interest entitling the owner to receive a specified percentage of the proceeds of the sale of oil and natural gas production or a percentage of the production, but requiring the owner of the working interest to bear the cost to explore for, develop and produce such oil and natural gas. A working interest owner who owns a portion of the working interest may participate either as operator or by voting his percentage interest to approve or disapprove the appointment of an operator and certain activities in connection with the development and operation of a property 43 Table of Contents Index to Financial Statements SIGNATURES Pursuant to the requirements of Section 13 or 15(d) of the Securities Exchange Act of 1934, the Registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized. Date: March 6, 2007 Pursuant to the requirements of the Securities and Exchange Act of 1934, this report has been signed below by the following persons on behalf of the Registrant and in the capacities and on the dates indicated. 44 DORCHESTER MINERALS, L.P. By: Dorchester Minerals Management LP, its general partner By: Dorchester Minerals Management GP LLC, its general partner By: /s/ William Casey McManemin William Casey McManemin Chief Executive Officer /s/ William Casey McManemin /s/ H.C. Allen, Jr. William Casey McManemin Chief Executive Officer and Manager (Principal Executive Officer) Date: March 6, 2007 H.C. Allen, Jr. Chief Financial Officer and Manager (Principal Financial and Accounting Officer) Date: March 6, 2007 /s/ James E. Raley /s/ Buford P. Berry James E. Raley Chief Operating Officer and Manager Date: March 6, 2007 Buford P. Berry Manager Date: March 6, 2007 /s/ Rawles Fulgham /s/ Preston A. Peak Rawles Fulgham Manager Date: March 6, 2007 Preston A. Peak Manager Date: March 6, 2007 /s/ C.W. Russell /s/ Robert C. Vaughn C.W. Russell Manager Date: March 6, 2007 Robert C. Vaughn Manager Date: March 6, 2007 Table of Contents Index to Financial Statements DORCHESTER MINERALS, L.P. (A Delaware Limited Partnership) INDEX TO FINANCIAL STATEMENTS F-1 Dorchester Minerals, L.P. Reports of Independent Registered Public Accounting Firm F-2 Balance Sheets as of December 31, 2006 and 2005 F-4 Statements of Operations for the Years Ended December 31, 2006, 2005 and 2004 F-5 Statements of Cash Flows for the Years Ended December 31, 2006, 2005 and 2004 F-6 Statement of Changes in Partnership Capital for the Years Ended December 31, 2006, 2005 and 2004 F-7 Notes to Financial Statements F-8 Table of Contents Index to Financial Statements REPORT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM General Partner and Unitholders Dorchester Minerals, L.P. We have audited management’s assessment included in “Management’s Annual Report on Internal Control Over Financial Reporting” that Dorchester Minerals, L.P. (a Delaware Limited Partnership) maintained effective internal control over financial reporting as of December 31, 2006, based on criteria established in Internal Control __ Integrated Framework issued by the Committee of Sponsoring Organizations of the Treadway Commission (COSO). Dorchester Minerals, L.P.’s management is responsible for maintaining effective internal control over financial reporting and for its assessment of the effectiveness of internal control over financial reporting. Our responsibility is to express an opinion on management’s assessment and an opinion on the effectiveness of the partnership’s internal control over financial reporting based on our audit. We conducted our audit in accordance with the standards of the Public Company Accounting Oversight Board (United States). Those standards require that we plan and perform the audit to obtain reasonable assurance about whether effective internal control over financial reporting was maintained in all material respects. Our audit included obtaining an understanding of internal control over financial reporting, evaluating management’s assessment, testing and evaluating the design and operating effectiveness of internal control, and performing such other procedures as we considered necessary in the circumstances. We believe that our audit provides a reasonable basis for our opinions. A company’s internal control over financial reporting is a process designed to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles. A company’s internal control over financial reporting includes those policies and procedures that (1) pertain to the maintenance of records that, in reasonable detail, accurately and fairly reflect the transactions and dispositions of the assets of the company; (2) provide reasonable assurance that transactions are recorded as necessary to permit preparation of financial statements in accordance with generally accepted accounting principles, and that receipts and expenditures of the company are being made only in accordance with authorizations of management and directors of the company; and (3) provide reasonable assurance regarding prevention or timely detection of unauthorized acquisition, use, or disposition of the company’s assets that could have a material effect on the financial statements. Because of its inherent limitations, internal control over financial reporting may not prevent or detect misstatements. Also, projections of any evaluation of effectiveness to future periods are subject to the risk that controls may become inadequate because of changes in conditions, or that the degree of compliance with the policies or procedures may deteriorate. In our opinion, management’s assessment that Dorchester Minerals, L.P. maintained effective internal control over financial reporting as of December 31, 2006, is fairly stated, in all material respects, based on criteria established in Internal Control __ Integrated Framework issued by the Committee of Sponsoring Organizations of the Treadway Commission (COSO). Also, in our opinion, Dorchester Minerals, L.P. maintained, in all material respects, effective internal control over financial reporting as of December 31, 2006, based on criteria established in Internal Control __ Integrated Framework issued by the Committee of Sponsoring Organizations of the Treadway Commission (COSO). We also have audited, in accordance with the standards of the Public Company Accounting Oversight Board (United States), the balance sheets of Dorchester Minerals, L.P. as of December 31, 2006 and 2005, and the related statements of operations, changes in partnership capital, and cash flows for each of the three years in the period ended December 31, 2006, and our report dated March 6, 2007 expressed an unqualified opinion on those financial statements. Dallas, Texas March 6, 2007 F-2 /s/ GRANT THORNTON LLP Grant Thornton LLP Table of Contents Index to Financial Statements REPORT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM General Partner and Unitholders Dorchester Minerals, L.P. We have audited the accompanying balance sheets of Dorchester Minerals, L.P. as of December 31, 2006 and 2005, and the related statements of operations, changes in partnership capital, and cash flows for each of the three years in the period ended December 31, 2006. These financial statements are the responsibility of the Partnership’s management. Our responsibility is to express an opinion on these financial statements based on our audits. We conducted our audits in accordance with the standards of the Public Company Accounting Oversight Board (United States). Those standards require that we plan and perform the audit to obtain reasonable assurance about whether the financial statements are free of material misstatement. An audit includes examining, on a test basis, evidence supporting the amounts and disclosures in the financial statements. An audit also includes assessing the accounting principles used and significant estimates made by management, as well as evaluating the overall financial statement presentation. We believe that our audits provide a reasonable basis for our opinion. In our opinion, the financial statements referred to above present fairly, in all material respects, the financial position of Dorchester Minerals, L.P. as of December 31, 2006 and 2005, and the results of its operations and its cash flows for each of the three years in the period ended December 31, 2006, in conformity with accounting principles generally accepted in the United States of America. We also have audited, in accordance with the standards of the Public Company Accounting Oversight Board (United States), the effectiveness of Dorchester Minerals, L.P.’s internal control over financial reporting as of December 31, 2006, based on criteria established in Internal Control—Integrated Framework issued by the Committee of Sponsoring Organizations of the Treadway Commission (COSO) and our report dated March 6, 2007 expressed an unqualified opinion on management’s assessment of the effectiveness of internal control over financial reporting and an unqualified opinion on the effectiveness of internal control over financial reporting. Dallas, Texas March 6, 2007 F-3 /s/ Grant Thornton LLP Grant Thornton LLP Table of Contents Index to Financial Statements DORCHESTER MINERALS, L.P. (A Delaware Limited Partnership) BALANCE SHEETS December 31, 2006 and 2005 (Dollars in Thousands) The accompanying notes are an integral part of these financial statements. F-4 2006 2005 ASSETS Current assets: Cash and cash equivalents $ 13,927 $ 23,389 Trade receivables 6,088 7,615 Net profits interests receivable—related party 4,126 6,996 Current portion of note receivable—related party 50 50 Prepaid expenses — 22 Total current assets 24,191 38,072 Note receivable—related party less current portion 5 55 Other non-current assets 19 19 Total 24 74 Property and leasehold improvements—at cost: Oil and natural gas properties (full cost method) 291,875 291,875 Less accumulated full cost depletion 148,064 129,643 Total 143,811 162,232 Leasehold improvements 512 512 Less accumulated amortization 109 60 Total 403 452 Net property and leasehold improvements 144,214 162,684 Total assets $ 168,429 $ 200,830 LIABILITIES AND PARTNERSHIP CAPITAL Current liabilities: Accounts payable and other current liabilities $ 303 $ 580 Current portion of deferred rent incentive 39 39 Total current liabilities 342 619 Deferred rent incentive less current portion 287 326 Total liabilities 629 945 Commitments and contingencies (Note 4) Partnership capital: General partner 6,797 7,663 Unitholders 161,003 192,222 Total partnership capital 167,800 199,885 Total liabilities and partnership capital $ 168,429 $ 200,830 Table of Contents Index to Financial Statements DORCHESTER MINERALS, L.P. (A Delaware Limited Partnership) STATEMENTS OF OPERATIONS For the Years Ended December 31, 2006, 2005 and 2004 (Dollars in Thousands, except per unit amounts) The accompanying notes are an integral part of these financial statements. F-5 2006 2005 2004 Operating revenues: Royalties $ 45,171 $ 46,285 $ 30,770 Net profits interest 22,298 31,801 24,387 Lease bonus 7,418 1,680 1,610 Other 40 66 261 Total operating revenues 74,927 79,832 57,028 Costs and expenses: Production taxes 2,238 2,347 1,317 Operating expenses 1,820 1,261 1,206 Depreciation, depletion and amortization 18,470 20,858 20,795 General and administrative expenses 3,058 2,892 3,626 Total costs and expenses 25,586 27,358 26,944 Operating income 49,341 52,474 30,084 Other income (expense), net 869 301 (8 ) Net earnings $ 50,210 $ 52,775 $ 30,076 Allocation of net earnings: General Partner $ 1,520 $ 1,427 $ 770 Unitholders $ 48,690 $ 51,348 $ 29,306 Net earnings per common unit (basic and diluted) $ 1.72 $ 1.82 $ 1.07 Weighted average common units outstanding (000’s) 28,240 28,240 27,343 Table of Contents Index to Financial Statements DORCHESTER MINERALS, L.P. (A Delaware Limited Partnership) STATEMENTS OF CASH FLOWS For the Years Ended December 31, 2006, 2005 and 2004 (Dollars in Thousands) The accompanying notes are an integral part of these financial statements. F-6 2006 2005 2004 Cash flows from operating activities: Net earnings $ 50,210 $ 52,775 $ 30,076 Adjustments to reconcile net earnings to net cash provided by operating activities: Depreciation, depletion and amortization 18,470 20,858 20,795 Write-off related to unsuccessful acquisition — 57 87 Amortization of deferred rent (39 ) (40 ) (10 ) Changes in operating assets and liabilities: Trade receivables 1,527 (2,226 ) (1,908 ) Net profits interests receivable—related party 2,870 (2,246 ) (573 ) Prepaid expenses 22 (16 ) 44 Accounts payable and other current liabilities (277 ) (50 ) 118 Net cash provided by operating activities 72,783 69,112 48,629 Cash Flows from investing activities: Proceeds from note receivable—related party 50 50 50 Acquisition of royalty interests — — 1,068 Capital expenditures — (110 ) (562 ) Net cash provided by (used in) investing activities 50 (60 ) 556 Cash flows from financing activities: Distributions paid to partners (82,295 ) (58,028 ) (47,701 ) Increase (decrease) in cash and cash equivalents (9,462 ) 11,024 1,484 Cash and cash equivalents at beginning of year 23,389 12,365 10,881 Cash and cash equivalents at end of year $ 13,927 $ 23,389 $ 12,365 Noncash investing and financing activities: Acquisition of assets for units Oil and gas properties $ — $ — $ 24,324 Value assigned to assets acquired $ — $ — $ 24,324 Supplemental cash flow and other information: Noncash additions to leasehold improvements $ — $ — $ 415 Table of Contents Index to Financial Statements DORCHESTER MINERALS, L.P. (A Delaware Limited Partnership) STATEMENTS OF CHANGES IN PARTNERSHIP CAPITAL For the Years Ended December 31, 2006, 2005, and 2004 (Dollars in Thousands) The accompanying notes are an integral part of these financial statements. F-7 Year General Partner Unitholders Total 2004 Balance at January 1, 2004 $ 8,246 $ 190,193 $ 198,439 Net earnings 770 29,306 30,076 Acquisition of assets for units — 24,324 24,324 Distributions ($1.698211 per Unit) (1,209 ) (46,492 ) (47,701 ) Balance at December 31, 2004 7,807 197,331 205,138 2005 Net earnings 1,427 51,348 52,775 Distributions ($1.999147 per Unit) (1,571 ) (56,457 ) (58,028 ) Balance at December 31, 2005 7,663 192,222 199,885 2006 Net earnings 1,520 48,690 50,210 Distributions ($2.829597 per Unit) (2,386 ) (79,909 ) (82,295 ) Balance at December 31, 2006 $ 6,797 $ 161,003 $ 167,800 Table of Contents Index to Financial Statements DORCHESTER MINERALS, L.P. (A Delaware Limited Partnership) NOTES TO FINANCIAL STATEMENTS December 31, 2006, 2005 and 2004 Nature of Operations —In these Notes, the term “Partnership,” as well as the terms “us,” “our,” “we,” and “its” are sometimes used as abbreviated references to Dorchester Minerals, L.P. itself or Dorchester Minerals, L.P. and its related entities. Our Partnership is a Dallas, Texas based owner of producing and non-producing natural gas and crude oil royalty, net profits, and leasehold interests in 573 counties and 25 states. We are a publicly traded Delaware limited partnership that was formed in December 2001, and commenced operations on January 31, 2003. Basis of Presentation— Per-unit information is calculated by dividing the earnings or loss applicable to holders of our Partnership’s common units by the weighted average number of units outstanding. The Partnership has no potentially dilutive securities and consequently basic and dilutive earnings per unit do not differ. Reclassification —Certain amounts in the 2004 and 2005 financial statements have been reclassified to conform to the 2006 presentation. Estimates— The preparation of financial statements in conformity with accounting principles generally accepted in the United States of America requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. For example, estimates of uncollected revenues and unpaid expenses from royalties and Net Profits Interests in properties operated by non-affiliated entities are particularly subjective due to inability to gain accurate and timely information. Therefore, actual results could differ from those estimates. See “Item 1. Business—Customers and Pricing” and “Item 2. “Properties—Royalty Properties” for additional discussion. The discounted present value of our proved oil and gas reserves is a major component of the ceiling calculation and requires many subjective judgments. Estimates of reserves are forecasts based on engineering and geological analyses. Different reserve engineers may reach different conclusions as to estimated quantities of natural gas reserves based on the same information. Our reserve estimates are prepared by independent consultants. The passage of time provides more qualitative information regarding reserve estimates, and revisions are made to prior estimates based on updated information. However, there can be no assurance that more significant revisions will not be necessary in the future. Significant downward revisions could result in an impairment representing a non-cash charge to earnings. In addition to the impact on calculation of the ceiling test, estimates of proved reserves are also a major component of the calculation of depletion. See the discussion under Property and Equipment. General Partner— Our general partner is Dorchester Minerals Management LP, referred to in these Notes as “our general partner.” Our general partner owns all of the partnership interests in Dorchester Minerals Operating LP, the operating partnership. See Note 3 — Related Party Transactions. The general partner is allocated 1% and 4% of our Net Profits Interests and Royalty Properties revenues, respectively. Our executive officers all own an interest in our general partner and receive no compensation for services as officers of our Partnership. Cash and Cash Equivalents— Our principal banking is with major financial institutions. Cash balances in these accounts may, at times, exceed federally insured limits. We have not experienced any losses in such cash accounts and do not believe we are exposed to any significant risk on cash and cash equivalents. Short term investments with a maturity of three months or less are considered to be cash equivalents and are carried at cost, which approximates fair value. F-8 1. General and Summary of Significant Accounting Policies Table of Contents Index to Financial Statements DORCHESTER MINERALS, L.P. (A Delaware Limited Partnership) NOTES TO FINANCIAL STATEMENTS—(Continued) December 31, 2006, 2005 and 2004 Concentration of Credit Risks— Our Partnership, as a royalty owner, has no control over the volumes or method of sale of oil and natural gas produced and sold from the Royalty Properties. It is believed that the loss of any single customer would not have a material adverse effect on the results of our operations. Fair Value of Financial Instruments— The carrying amount of cash and cash equivalents, trade receivables and payables approximates fair value because of the short maturity of those instruments. These estimated fair values may not be representative of actual values of the financial instruments that could have been realized as of year-end or that will be realized in the future. Trade Receivables— Our Partnership’s trade receivables consist primarily of Royalty Properties payments receivable and Net Profits Interest payments receivable. Most payments are received two to four months after production date. No allowance for doubtful accounts is deemed necessary. Note Receivable—Related Party— Our Note Receivable consists of a five-year note payable by Dorchester Minerals Operating LP, referred to in these Notes as “the operating partnership,” bearing interest at 6% having an original amount of $250,836. Principal and interest payments are received quarterly. Property and Equipment— We utilize the full cost method of accounting for costs related to our oil and gas properties. Under this method, all such costs are capitalized and amortized on an aggregate basis over the estimated lives of the properties using the units-of-production method. These capitalized costs are subject to a ceiling test, however, which limits such pooled costs to the aggregate of the present value of future net revenues attributable to proved oil and gas reserves discounted at 10% plus the lower of cost or market value of unproved properties. Our Partnership did not assign any value to unproved properties, including nonproducing royalty, mineral and leasehold interests. The full cost ceiling is evaluated at the end of each quarter and when events indicate possible impairment. While the quantities of proved reserves require substantial judgment, the associated prices of oil and gas reserves that are included in the discounted present value of our reserves are objectively determined. The ceiling test calculation requires use of prices and costs in effect as of the last day of the accounting period, which are generally held constant for the life of the properties. As a result, the present value is not necessarily an indication of the fair value of the reserves. Oil and gas prices have historically been volatile and the prevailing prices at any given time may not reflect our Partnership’s or the industry’s forecast of future prices. Our Partnership’s properties are being depleted on the unit-of-production method using estimates of proved oil and gas reserves. Gains and losses are recognized upon the disposition of oil and gas properties involving a significant portion (greater than 25%) of our Partnership’s reserves. Proceeds from other dispositions of oil and gas properties are credited to the full cost pool. No gains or losses have been recorded for 2006, 2005 or 2004. Leasehold improvements include $415,000 received in 2004 as an incentive in our office space lease and is offset in liabilities as deferred rent. Leasehold improvements are amortized over the shorter of their estimated useful lives or the related lease life of 10 years. For leases with renewal periods at the partnership’s option, we have used the original lease term, excluding renewal option periods to determine useful life. Deferred rent is being amortized to general and administrative expense over the same term as the leasehold improvements, which is 10 years. Asset Retirement Obligations —Based on the nature of our property ownership we have no material obligation required to be recorded. F-9 Table of Contents Index to Financial Statements DORCHESTER MINERALS, L.P. (A Delaware Limited Partnership) NOTES TO FINANCIAL STATEMENTS—(Continued) December 31, 2006, 2005 and 2004 Revenue Recognition —The pricing of oil and natural gas sales from the Royalty Properties is primarily determined by supply and demand in the marketplace and can fluctuate considerably. As a royalty owner, we have extremely limited involvement and operational control over the volumes and method of sale of oil and natural gas produced and sold from the Royalty Properties. Revenues from Royalty Properties and Net Profits Interests are recorded under the cash receipts approach as directly received from the remitters’ statement, accompanying the revenue check. Since the revenue checks are generally received two to four months after the production month, the Partnership accrues for revenue earned but not received by estimating production volumes and product prices. Income Taxes— We are treated as a partnership for income tax purposes and, as a result, our income or loss is includible in the tax returns of the individual unitholders. Unitholders should consult tax advisors concerning their own tax situation. Depletion of natural gas properties is an expense allowable to each individual partner and the depletion expense as reported on the financial statements will not be indicative of the depletion expense an individual partner or Unitholder may be able to deduct for income tax purposes. On September 30, 2004, we acquired, through Dorchester Minerals Acquisition LP, assets related to oil and gas properties consisting of producing and non-producing perpetual mineral and royalty interests located in 104 counties and parishes in six states in exchange for 1,200,000 common units of Dorchester Minerals. Net assets acquired at the date of acquisition totaled $24,324,000. On May 2, 2005, we filed a registration statement on Form S-4 with the Securities and Exchange Commission to register 5,000,000 common units that may be offered and issued by the Partnership from time to time in connection with asset acquisitions or other business combination transactions. As of March 6, 2007, none of the 5,000,000 units have been offered. F-10 2. Acquisitions Table of Contents Index to Financial Statements DORCHESTER MINERALS, L.P. (A Delaware Limited Partnership) NOTES TO FINANCIAL STATEMENTS—(Continued) December 31, 2006, 2005 and 2004 Our general partner owns all of the partnership interests in the operating partnership. It is the employer of all personnel, owns the working interests and other properties underlying our Net Profits Interests, and provides day-to-day operational and administrative services to us and the general partner. In accordance with our partnership agreement, we reimburse the general partner for certain allocable General and Administrative costs, including rent, salaries, and employee benefit plans. These types of reimbursements are limited to 5% of distributions, plus certain costs previously paid. All such costs have been substantially below the 5% limit amount. Additionally, certain reimbursable direct costs such as professional and regulatory fees and ad valorem and severance taxes are not limited. Significant activity between the partnership and the operating partnership consists of the following: 3. Related Party Transactions Thousands of Dollars From/To Operating Partnership 2006 2005 2004 Net Profits Interests Payments Receivable or Accrued (1) $ 4,126 $ 6,996 $ 4,750 Note Receivable $ 55 $ 105 $ 155 Interest Income related to Net Profits Interest Payment $ 8 $ 6 $ —General & Administrative Amounts Payable $ 40 $ 86 $ 28 General & Administrative Amounts Accrued $ 23 $ 19 $ 29 Total General & Administrative Amounts $ 2,088 $ 1,716 $ 1,789 Less than $15,000 in fees for legal services were paid in 2006, 2005 and 2004 to a family member of a member of our executive management. In January 2002, some individuals and an association called Rural Residents for Natural Gas Rights sued Dorchester Hugoton, Ltd., along with several other operators in Texas County, Oklahoma. The operating partnership now owns and operates the properties formerly owned by Dorchester Hugoton. These properties contribute a major portion of the Net Profits Interests amounts paid to the Partnership. The plaintiffs consist primarily of Texas County, Oklahoma residents who, in residences located on leases use natural gas from gas wells located on the same leases, at their own risk, free of cost. The plaintiffs seek declaration that their domestic gas use is not limited to stoves and inside lights and is not limited to a principal dwelling as provided in the oil and gas leases entered into in the 1930s to the 1950s. Plaintiffs’ claims against defendants include failure to prudently operate wells, violation of rights to free domestic gas, and fraud. Plaintiffs also seek certification of class action against defendants. On October 1, 2004, the plaintiffs severed claims against the operating partnership regarding royalty underpayments. The operating partnership believes plaintiffs’ claims, including severed claims, are completely without merit. Based upon past measurements of such domestic gas usage, the operating partnership believes the domestic gas damages sought by plaintiffs to be minimal. An adverse decision could reduce amounts the Partnership receives from the Net Profits Interests. Our Partnership and the operating partnership are involved in other legal and/or administrative proceedings arising in the ordinary course of their businesses, none of which have predictable outcomes and none of which are believed to have any significant effect on our financial position, cash flows, or operating results. F-11 (1) All Net Profits Interests income on the financial statements is from the operating partnership. 4. Commitments and Contingencies Table of Contents Index to Financial Statements DORCHESTER MINERALS, L.P. (A Delaware Limited Partnership) NOTES TO FINANCIAL STATEMENTS—(Continued) December 31, 2006, 2005 and 2004 Operating Leases— We have entered into a non-cancelable, renewable at prevailing rate for an additional five years, operating lease agreement in the ordinary course of our business activities. The lease is for our office space at 3838 Oak Lawn Avenue, Suite 300, Dallas, Texas, and expires in 2015. Rental expense related to the lease was $174,000, $203,000, and $54,000 for the years ended December 31, 2006, 2005, and 2004 respectively. Minimum rental commitments under the terms of our operating leases are as follows (in thousands): Unitholder cash distributions per common unit have been: Distributions beginning with the third quarter 2004 were paid on 28,240,431 units; previous distributions were paid on 27,040,431 units. Fourth quarter distributions are paid in February of the following calendar year to unitholders of record in January or February of such following year. The partnership agreement requires the next cash distribution to be paid by May 15, 2007. The Net Profits Interests represent net profits overriding royalty interests in various properties owned by the operating partnership. The Royalty Properties consist of producing and nonproducing mineral, royalty, overriding royalty, net profits, and leasehold interests located in 573 counties and parishes in 25 states. We retained the independent petroleum engineering firm of Huddleston & Co., Inc. to estimate proved oil and natural gas reserves attributable to the Royalty Properties as of December 31, 2006. The operating partnership retained the independent petroleum engineering firm of Calhoun, Blair & Associates, Inc. to estimate proved oil and natural gas reserves attributable to its interest in the properties underlying the Net Profits Interests as of December 31, 2006. Amounts set forth herein attributable to the Net Profits Interests reflect our 96.97% net share of Calhoun, Blair’s estimates. Although new discoveries have occurred on certain of the Royalty Properties, based on engineering studies available to date, no events have occurred since December 31, 2006 that would have a material effect on our estimated proved developed reserves. F-12 Years Ending December 31, Minimum Payments 2007 $ 213 2008 216 2009 225 2010 228 2011 237 Thereafter 815 Total $ 1,934 5. Distribution To Holders Of Common Units Per Unit Amount 2004 2005 2006 First Quarter $ 0.415634 $ 0.481242 $ 0.729852 Second Quarter $ 0.415315 $ 0.514542 $ 0.778120 Third Quarter $ 0.476196 $ 0.577287 $ 0.516082 Fourth Quarter $ 0.426076 $ 0.805543 $ 0.478596 6. Unaudited Oil and Natural Gas Reserve and Standardized Measure Information Table of Contents Index to Financial Statements DORCHESTER MINERALS, L.P. (A Delaware Limited Partnership) NOTES TO FINANCIAL STATEMENTS—(Continued) December 31, 2006, 2005 and 2004 In accordance with SFAS No. 69 and Securities and Exchange Commission rules and regulations, the following information is presented with regard to the Net Profits Interests and Royalty Properties oil and gas reserves, all of which are proved, developed and located in the United States. These rules require inclusion as a supplement to the basic financial statements a standardized measure of discounted future net cash flows relating to proved oil and gas reserves. The standardized measure, in management’s opinion, should be examined with caution. The basis for these disclosures are independent petroleum engineer’s reserve studies which contain imprecise estimates of quantities and rates of production of reserves. Revision of prior year estimates can have a significant impact on the results. Also, exploration and production improvement costs in one year may significantly change previous estimates of proved reserves and their valuation. Values of unproved properties and anticipated future price, and cost increases or decreases are not considered. Therefore, the standardized measure is not necessarily a “best estimate” of the fair value of oil and gas properties or of future net cash flows. The following summaries of changes in reserves and standardized measure of discounted future net cash flows were prepared from estimates of proved reserves developed by independent petroleum engineers. The production volumes and reserve volumes shown for properties formerly owned by Dorchester Hugoton are wellhead volumes which differ from sales volumes shown in “Item 7.—Management’s Discussion and Analysis of Financial Condition and Results of Operations” because of fuel, shrinkage and pipeline loss. The Standardized Measure of Discounted Future Net Cash Flows reflects adjustments for such fuel, shrinkage and pipeline loss. Summary of Changes in Proved Reserves F-13 Oil (mbbl) Natural Gas (mmcf) 2006 2005 2004 2006 2005 2004 Estimated quantity, beginning of year 4,029 3,937 3,769 66,299 69,459 70,127 Purchase of minerals in place — — 241 — — 3,033 Revisions in previous estimates 117 443 234 8,467 6,128 5,703 Production (344 ) (351 ) (307 ) (8,968 ) (9,288 ) (9,404 ) Estimated quantity, end of year 3,802 4,029 3,937 65,798 66,299 69,459 Table of Contents Index to Financial Statements DORCHESTER MINERALS, L.P. (A Delaware Limited Partnership) NOTES TO FINANCIAL STATEMENTS—(Continued) December 31, 2006, 2005 and 2004 Standardized Measure of Discounted Future Net Cash Flows (Dollars in Thousands) Quarterly financial data for the last two years (in thousands except per unit data) is summarized as follows: F-14 2006 2005 2004 Future estimated gross revenues $ 482,053 $ 651,583 $ 474,897 Future estimated production costs (23,478 ) (32,203 ) (23,638 ) Future estimated net revenues 458,575 619,380 451,259 10% annual discount for estimated timing of cash flows (212,416 ) (275,699 ) (196,672 ) Standardized measure of discounted future estimated net cash flows $ 246,159 $ 343,681 $ 254,587 Sales of oil and natural gas produced, net of production costs $ (63,410 ) $ (74,477 ) $ (52,634 ) Purchase of reserves in place — — 15,159 Net changes in prices and production costs (71,241 ) 90,466 19,827 Revisions of previous quantity estimates 25,458 33,375 19,438 Accretion of discount 34,368 25,459 23,382 Change in production rate and other (22,697 ) 14,271 (4,407 ) Net change in standardized measure of discounted future estimated net cash flows $ (97,522 ) $ 89,094 $ 20,765 Depletion of oil and natural gas properties (dollars per mcfe) $ 1.67 $ 1.83 $ 1.85 Property acquisition costs $ — $ — $ 23,568 7. Unaudited Quarterly Financial Data 2006 Quarter Ended 2005 Quarter Ended March 31 June 30 Sept. 30 Dec. 31 March 31 June 30 Sept. 30 Dec. 31 Net operating revenues $ 19,267 $ 23,128 $ 16,897 $ 15,635 $ 14,419 $ 16,971 $ 23,669 $ 24,773 Net earnings $ 13,060 $ 16,789 $ 10,392 $ 9,969 $ 7,876 $ 10,191 $ 16,403 $ 18,305 Net earnings per Unit $ 0.45 $ 0.58 $ 0.36 $ 0.33 $ 0.27 $ 0.35 $ 0.57 $ 0.63 Weighted average common units outstanding 28,240 28,240 28,240 28,240 28,240 28,240 28,240 28,240 Exhibit 21.1 1. Dorchester Minerals Oklahoma LP, an Oklahoma limited partnership 2. Dorchester Minerals Oklahoma GP Inc., an Oklahoma corporation 3. Dorchester Minerals Acquisition LP, an Oklahoma limited partnership 4. Dorchester Minerals Acquisition GP Inc., an Oklahoma corporation Exhibit 23.1 CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM We have issued our reports dated March 6, 2007, accompanying the financial statements and management’s assessment of the effectiveness of internal control over financial reporting included in the Annual Report of Dorchester Minerals, L.P. on Form 10-K for the year ended December 31, 2006. We hereby consent to the incorporation by reference of said reports in the Registration Statements of Dorchester Minerals L.P., on Form S-4 (File No. 333-124544, effective May 2, 2005). Grant Thornton LLP Dallas, Texas March 6, 2007 Exhibit 23.2 C ALHOUN , B LAIR & A SSOCIATES P ETROLEUM C ONSULTANTS 4625 G REENVILLE A VENUE , S UITE 102 D ALLAS , T EXAS 75206 214-522-4925 RGBLAIR@SWBELL.NET February 26, 2007 Dorchester Minerals, L.P. 3838 Oak Lawn Avenue, Suite 300 Dallas, TX 75219 Gentlemen: As independent petroleum consultants, we hereby consent to the incorporation by reference in the Registration Statement on Form S-4 (No. 333-124544) of Dorchester Minerals, L.P. of our estimates of reserves, included in this Annual Report on Form 10-K, and to all references to our firm included in this Annual Report. CALHOUN, BLAIR & ASSOCIATES / S / R OBERT G. B LAIR , P.E. Robert G. Blair, P.E. President Exhibit 23.3 1 H OUSTON C ENTER 1221 M C K INNEY , S UITE 3700 H OUSTON , T EXAS 77010 PHONE (713) 209-1100 • FAX (713) 752-0828 CONSENT OF INDEPENDENT PETROLEUM CONSULTANTS Huddleston & Co., Inc. does hereby consent to the incorporation by reference in the Registration Statement on Form S-4 (No. 333-124544) of Dorchester Minerals, L.P. of our estimates of reserves, included in this Annual Report on Form 10-K, and to all references to our firm included in this Annual Report. Houston, Texas March 1, 2007 HUDDLESTON & CO., INC. /s/ Gregory S. Floyd, P.E. By: Gregory S. Floyd, P.E. Vice President Exhibit 31.1 CERTIFICATION I, William Casey McManemin, Chief Executive Officer of Dorchester Minerals Management GP LLC, General Partner of Dorchester Minerals Management LP, General Partner of Dorchester Minerals, L.P., (the “Registrant”), certify that: 1. I have reviewed this annual report on Form 10-K of Dorchester Minerals, L.P.; 2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report; 3. Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the Registrant as of, and for, the periods presented in this report; 4. The Registrant’s other certifying officer and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d – 15(f) for the Registrant and have: a) Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the Registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared; b) Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles. c) Evaluated the effectiveness of the Registrant’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the controls and procedures, as of the end of the period covered by this report based on such evaluation; and d) Disclosed in this report any change in the Registrant’s internal control over financial reporting that occurred during the Registrant’s most recent fiscal quarter that has materially affected, or is reasonably likely to materially affect, the Registrant’s internal control over financial reporting; and 5. The Registrant’s other certifying officer and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the Registrant’s auditors and the audit committee of the Registrant’s board of directors (or persons performing the equivalent functions): a) All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the Registrant’s ability to record, process, summarize and report financial information; and b) Any fraud, whether or not material, that involves management or other employees who have a significant role in the Registrant’s internal control over financial reporting. /s/ William Casey McManemin William Casey McManemin Date: March 6, 2007 Chief Executive Officer Exhibit 31.2 CERTIFICATION I, H.C. Allen, Jr., Chief Financial Officer of Dorchester Minerals Management GP LLC, General Partner of Dorchester Minerals Management LP, General Partner of Dorchester Minerals, L.P., (the “Registrant”), certify that: 1. I have reviewed this annual report on Form 10-K of Dorchester Minerals, L.P.; 2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report; 3. Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the Registrant as of, and for, the periods presented in this report; 4. The Registrant’s other certifying officer and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d – 15(f) for the Registrant and have: a) Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the Registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared; b) Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles. c) Evaluated the effectiveness of the Registrant’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the controls and procedures, as of the end of the period covered by this report based on such evaluation; and d) Disclosed in this report any change in the Registrant’s internal control over financial reporting that occurred during the Registrant’s most recent fiscal quarter that has materially affected, or is reasonably likely to materially affect, the Registrant’s internal control over financial reporting; and 5. The Registrant’s other certifying officer and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the Registrant’s auditors and the audit committee of the Registrant’s board of directors (or persons performing the equivalent functions): a) All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the Registrant’s ability to record, process, summarize and report financial information; and b) Any fraud, whether or not material, that involves management or other employees who have a significant role in the Registrant’s internal control over financial reporting. /s/ H.C. Allen, Jr. H.C. Allen, Jr. Date: March 6, 2007 Chief Financial Officer Exhibit 32.1 CERTIFICATION PURSUANT TO SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002 (18 U.S.C. SECTION 1350) In connection with the accompanying Annual Report of Dorchester Minerals, L.P., (the “Partnership”) on Form 10-K for the period ended December 31, 2006 (the “Report”), each of the undersigned officers of Dorchester Minerals Management GP LLC, General Partner of Dorchester Minerals Management LP, General Partner of the Partnership, hereby certifies that: (1) The Report fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934 (15 U.S.C. 78m or 78o(d)); and (2) The information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Partnership. /s/ William Casey McManemin William Casey McManemin Date: March 6, 2007 Chief Executive Officer Date: March 6, 2007 /s/ H.C. Allen, Jr. H.C. Allen, Jr. Chief Financial Officer 

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