A miner with body scars works at Gecamines concession near the centre of Lubumbashi in the Democratic Republic of Congo, in this recent file photo. Thousands of artisanal miners feed off the mine, selling copper and cobalt compounds to local and foreign owners of furnaces, earning less than a dollar per 50 kg (110 lb) sack of copper compounds. TO MATCH FEATURE CONGO-DEMOCRATIC-MINING. REUTERS/Dino Mahtani CRB