This is a combined analysis of the Kloof and Driefontein mines, operated and owned by Sibanye Gold. Collectively the two mines produce around 1 Moz of gold per year. Labour accounts for nearly 50% of operating costs. The key challenges facing the mines include labour relations driven mainly by inter-union rivalry. Power and water costs account for approximately 20% of operating costs. Unreliable power supply coupled with planned tariff increases from Eskom (the local power provider) has led Sibanye to consider alternative complementary sources of power. One alternative under consideration is the construction of a 150MW solar plant.