In this photo taken Aug. 17, 2012 photo, a man who used to earn a living mining cassiterite, the major ore of tin, poses for a portrait at the entrance to a mine shaft, at the largely-a

 

              In this photo taken Aug. 17, 2012 photo, a man who used to earn a living mining cassiterite, the major ore of tin, poses for a portrait at the entrance to a mine shaft, at the largely-a
In this photo taken Aug. 17, 2012 photo, a man who used to earn a living mining cassiterite, the major ore of tin, poses for a portrait at the entrance to a mine shaft, at the largely-abandoned Nyabibwe mine, in eastern Congo. Gold is now the primary source of income for armed groups in eastern Congo, and is ending up in jewelry stores across the world, according to a report published Thursday, Oct. 25, 2012, by the Enough Project. Following American legislation requiring companies to track the origin of the minerals they use, armed groups have been unable to profit from the exploitation of tin, tungsten, and tantalum, and have turned instead to gold, which is easier to smuggle across borders. Gold miners, like cassiterite miners, work in extreme conditions, with crude equipment such as pick-axes and shovels. (AP Photo/Marc Hofer)