FILE PHOTO: An excavator is used at the bottom of Congolese state mining company Gecamines’ Kamfundwa open pit copper mine January 31, 2013. REUTERS/Jonny Hogg/File Photo
FILE PHOTO: An excavator is used at the bottom of Congolese state mining company Gecamines’ Kamfundwa open pit copper mine January 31, 2013. REUTERS/Jonny Hogg/File Photo