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MUFULIRA, ZAMBIA- JULY 6: Mine workers wait to descend underground for an 8-hour shift mining copper in one of the shafts at Mopani on July 6, 2016. Glencore, an Anglo-Swiss multinational commodity trading and mining company, owns about 73 % of the mine, which produces copper and some cobalt. The mine employs about 15,000 people. (Photo by Per-Anders Pettersson)