The Congolese mining company sanctioned by the United States this week has said it "categorically rejects" allegations linking it to armed groups and mineral smuggling in the turbulent eastern ...

Rubaya produces around 15 percent of the world’s coltan, all dug manually by impoverished locals who earn a few dollars per day.

Here, we’ll be breaking down an in-depth Reuters investigation into the African nation’s mines and looking into why parties ...