At least 200 people reportedly died in a landslide at the Rubaya mines in eastern Congo on Wednesday amid heavy rains.

Several of the coltan mining sites, which are under the control of the M23 rebels, collapsed, and many bodies have not yet been found, the Associated Press (AP) reported Saturday.

According to Sky News, over 15 percent of the rare metal tantalum, which is extracted from coltan, is mined in the region. Tantalum is used in smartphones.

In addition, the article said its reporters found children as young as four working at mine sites in the Democratic Republic of the Congo.

A former miner told the outlet the tunnels are hand-dug…

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