TO GO WITH AFP STORY BY MARC JOURDIER This photo taken on May 31, 2015 near a mine between Lubumbashi and Kolwezi shows a man carrying a bag of minerals as people separate cobalt from sand and rock in a lake, one of 130,000 small-scale diggers trying to scratch a living from the region's rich earth. AFP PHOTO / FEDERICO SCOPPA (Photo credit should read FEDERICO SCOPPA/AFP/Getty Images)
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