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At least 32 young artisanal miners were killed Saturday when a cobalt mine collapsed in southern Democratic Republic of Congo, according to local officials. Search efforts are still underway. The DRC produces more than 70% of the world’s cobalt, a key metal used in electronics and electric-vehicle batteries. While most cobalt comes from large industrial mines, an estimated 200,000 people work as informal or illegal diggers. The collapse happened at the Kalando mining site in the Mulondo quarry,
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