FILE - In this May 17, 2012 file photo, a Congolese government army soldier displays a mortar round after his unit returned from fighting against rebel forces, in Kinyamahura, Congo. Go

 

              FILE - In this May 17, 2012 file photo, a Congolese government army soldier displays a mortar round after his unit returned from fighting against rebel forces, in Kinyamahura, Congo. Go
FILE - In this May 17, 2012 file photo, a Congolese government army soldier displays a mortar round after his unit returned from fighting against rebel forces, in Kinyamahura, 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. (AP Photo/Marc Hofer, File)