Rights groups raised concerns over conditions at the mine, which supplies about 15 percent of the world’s coltan used in advanced electronics.

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More than 200 people have been reported killed in a collapse at the Rubaya coltan mine in eastern Democratic Republic of the Congo (DRC), Lumumba Kambere Muyisa, spokesperson for the rebel-appointed governor of the province where the mine is located, told the Reuters news agency.

The mine, located some 60km (37 miles) northwest of Goma city, the provincial capital of North Kivu province, collapsed on Wednesday, and the precise number of casualties was still unclear as of Friday evening, Reuters reports.