Republic Democratic of Congo, North Kivu, Masisi, Rubaya. 16/09/2013 Coltan, a rare metal used to make mobile phones and computers, is a mixture of Columbite and Tantalite. Its market value is so high as to have aroused the interest of multinational corporations and criminal organizations: in order to destabilize the political situation and take control of the mining business at a reasonable price, financial backing is given to armed groups waging war on one another. Under the supervision of the buyers in Rwanda, soldiers and police control the territory, exploiting the local population and reselling its natural resources: the proceeds are used to buy other weapons that provide additional power, thus creating a vicious circle it is difficult to break. Workers exit a mine shaft. Miners dig 50 meters underground for the minerals before transporting them to a nearby river where they are separated from rocks and sand before being sold to dealers. Mine accidents are common.