FILE PHOTO: Excavators and drillers at work in an open pit at Tenke Fungurume, a copper and cobalt mine 110 km (68 miles) northwest of Lubumbashi in Congo’s copper-producing south. REUTERS/Jonny Hogg/File Photo
FILE PHOTO: Excavators and drillers at work in an open pit at Tenke Fungurume, a copper and cobalt mine 110 km (68 miles) northwest of Lubumbashi in Congo’s copper-producing south. REUTERS/Jonny Hogg/File Photo