Workers travel past the low sulphur emission smelter 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
