Southstone Minerals Limited is a Canada-based junior mining company. The Company holds a 43% interest in the Oena Diamond Mine (Oena), an alluvial diamond property, located in the Northern Cape Province, Republic of South Africa that consists of one New Order Mining Lease. The Oena Project (the Property) consists of order mining lease located in the Northern Cape Province, Republic of South Africa. The Oena is approximately 8,800 hectares in size and covers an approximately 4.8 kilometers (km) wide strip along a 15 km length of the lower Orange River. The Company owns 43% of African Star Minerals (Pty) Limited (ASM) which owns 100% of the Property. Its other subsidiaries include TGV Resources (Pty) Ltd (TGV) and GAH Mining (Pty) Ltd (GAH).