Southstone Minerals Limited operates as a Canadian junior mining firm, focused on the acquisition, exploration, and development of mineral properties. The company holds an interest in the Oena Diamond Mine, an alluvial diamond operation located within South Africa's Northern Cape Province, which has recently initiated active production of high-value diamonds. Established in 2007 and headquartered in Victoria, Canada, the company adopted its current name in October 2019, having previously traded as Tango Mining Limited.