Optimum Coal Holdings Limited produces and exports thermal coal. It has two operating mining complexes, located in the Mpumalanga province. Optimum Collieries is an opencast and underground mining complex, while Koornfontein Mines is an underground mining complex. Its segment include Optimum Coal Mine, Koornfontein Mines and Coal exploration. The Optimum Coal Mine and the Koornfontein Mines includes the production of coal for local and export market. The Coal exploration includes coal exploration through several subsidiary companies. Its Brownfield projects include Kwagga North project, Schoonoord project, TNC and Koornfontein No 4 Seam project. Its Greenfield projects include Vlakfontein, Overvaal , Mpefu and Remhoogte. During the fiscal year ended June 30, 2011, it disposed 26% interest in Afarak Platinum Holdings (Proprietary) Limited. In March 2012, Glencore International PLC, together with Cyril Rapmaphosa (together the Consortium), acquired 36.56% interest in the Company.