At the time, the road into the city was lined with corrugated-iron shacks, known as comptoirs, where traders bought cobalt or copper, which is also plentiful in the region. The man took some samples to one of the mineral traders who had established themselves around Kolwezi. Some creuseurs secure permits to work freelance at officially licensed pits, but many more sneak onto the sites at night or dig their own holes and tunnels, risking cave-ins and other dangers in pursuit of buried treasure. Many Congolese have taken jobs at industrial mines in the region others have become “artisanal diggers,” or creuseurs. Kolwezi now has more than half a million residents.

In recent decades, hundreds of thousands of Congolese have moved to the formerly remote area. Southern Congo sits atop an estimated 3.4 million metric tons of cobalt, almost half the world’s known supply. The man suspected that his discovery would make him wealthy-if he could get it out of the ground before others did. As global demand for lithium-ion batteries has grown, so has the price of cobalt. Among other things, cobalt keeps the batteries, which power everything from cell phones to electric cars, from catching fire. He had struck a seam of heterogenite, an ore that can be refined into cobalt, one of the elements used in lithium-ion batteries. About eight feet into the soil, his shovel hit a slab of gray rock that was streaked with black and punctuated with what looked like blobs of bright-turquoise mold. As the man later told neighbors, he had intended to create a pit for a new toilet. In June, 2014, a man began digging into the soft red earth in the back yard of his house, on the outskirts of Kolwezi, a city in the southern Democratic Republic of the Congo. This content can also be viewed on the site it originates from.

Cobalt price