" Mining might convey an image of industry or technology, but I found this was not the case in the Congo. In the so-called ‘mines’, a brutally primitive process was in place involving what was effectively slave labour clawing minerals from the earth so that they could be shipped to eager cash buyers in the developed world. President Kabila headed what was effectively a cobalt and diamond cartel, while two rival factions (one backed by neighbouring Uganda, the other by Rwanda) divided up the rest of the country’s resources. Crudely, Uganda got gold and timber, and Rwanda got tin and coltan – a mineral used in mobile telephones. "
― Tim Butcher , Blood River: A Journey to Africa's Broken Heart