Southstone Minerals Limited, a junior mining company, engages in the acquisition, exploration, evaluation, and development of mineral properties in Canada. It holds interest in the Oena Diamond Mine, an alluvial diamond property, which is located in the Northern Cape Province in South Africa. The company was formerly known as Tango Mining Limited and changed its name to Southstone Minerals Limited in October 2019. Southstone Minerals Limited was incorporated in 2007 and is based in Victoria, Canada.