Artisanal miners work at the Tilwizembe, a former industrial copper-cobalt mine, outside of Kolwezi, the capital city of Lualaba Province in the south of the Democratic Republic of the Congo, June 11, 2016. REUTERS/Aaron Ross/File Photo
Artisanal miners work at the Tilwizembe, a former industrial copper-cobalt mine, outside of Kolwezi, the capital city of Lualaba Province in the south of the Democratic Republic of the Congo, June 11, 2016. REUTERS/Aaron Ross/File Photo