Petra Diamonds Limited is an independent diamond mining company and supplier of rough diamonds to the international market. Its segments include Mining and Exploration. Mining segment includes the extraction and sale of rough diamonds from mining operations in South Africa and Tanzania. Exploration segment includes the exploration activities in Botswana and South Africa. Its portfolio includes over four underground kimberlite mines, an open cast kimberlite mine and tailings retreatment programs. Its mines include Finsch, Cullinan, Koffiefontein and Williamson. It has a resource base of approximately 312 million carats (Mcts). Cullinan ore body contains a diamond resource of approximately 194 Mcts. Koffiefontein mine produces white stones. Kimberley Underground operation comprises three kimberlite pipe mines: Bultfontein and Dutoitspan (serviced by the Joint Shaft and the Joint Shaft plant), and Wesselton (serviced by the Wesselton Shaft and the Wesselton plant).