DRC contaminated cobaltFirst read about this issue a few weeks ago. Looks like it's serious enough to halt operations there.
>>>(Bloomberg) -- Operations at a Zijin Mining Group Ltd. copper and cobalt mine in the Democratic Republic of Congo have been suspended due to worries about excessive radiation in its cobalt, according to people familiar with the matter....Cobalt is mined as a by-product of copper production and the COMMUS mine produced 129,000 tons of copper last year, about 4.2% of total output in the world’s second largest source of the metal. It also produced 2,200 tons of cobalt last year.
https://www.bnnbloomberg.ca/congo-copper-mine-suspended-amid-radiation-concerns-1.2061427