A mine worker walks through the concentrator plant at the Nchanga copper mine, operated by Konkola Copper Mines Plc, in Chingola, Zambia, on Thursday, March 17, 2016. Konkola Copper Mines is a unit of Vedanta Resources Plc, the mining company founded by Indian billionaire Anil Agarwal. Photographer: Waldo Swiegers/Bloomberg via Getty Images
