In the studies we conducted, the artisanal miners have more than forty times the amount of cobalt in their urine as the control groups. They also have five times the level of lead and four times the level of uranium. Even the inhabitants living close to the mining areas who do not work as artisanal miners have very high concentrations of trace metals in their systems, including cobalt, copper, zinc, lead, cadmium, germanium, nickel, vanadium, chromium, and uranium.
