sentences:  The Rift valley has exposed an enormous amount of mineral wealth throughout the south and east of the Congo, making it accessible to mining.Cobalt, copper, cadmium, industrial and gem-quality diamonds, gold, silver, zinc, manganese, tin, germanium, uranium, radium, bauxite, iron ore, and coal are all found in plentiful supply, especially in the Congo's southeastern Katanga region.On 17 January 2002 Mount Nyiragongo erupted in Congo, with the lava running out at and wide.