Processing facilities at Tenke Fungurume mine in 2023. EMMET LIVINGSTONE/AFP/Getty Images NAIROBI -- Emissions from a Chinese cobalt-processing plant in central Africa sickened residents and workers as the company raced to increase production of a mineral critical to making electric-car batteries, according to an investigation released Monday by a Washington environmental group.

Add Yahoo as a preferred source to see more of our stories on Google. The on-site management of a Canadian mining company in Mexico whose workers were killed earlier this year had allegedly established some level of co-ordination with an organized armed group in the region, according to a former employee and two ex-contractors.

Add Yahoo as a preferred source to see more of our stories on Google. Ten silver miners working for a Canadian company have been found dead in a Mexican mass grave, local officials have confirmed.

Minerals are back in the news, with President Donald Trump announcing on Wednesday that he'd reached an agreement on a possible deal on Greenland that would include rights to rare earth minerals.