Theta Gold Mines Limited, a gold exploration and development company based in Sydney, Australia, is primarily focused on its Theta project situated in Mpumalanga Province, South Africa. The company, formerly known as Stonewall Resources Limited, changed its name to Theta Gold Mines Limited in December 2018. Founded in 2008, the company aims to develop its Theta project near the town of Pilgrim's Rest and expand its gold resource base in the African region.