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small copper mine high frequency screen in North America

Kennecott officials closely monitor movements in the107-year-old mine– which produces 25 percent of thecopperused in theUnited States– and they recognized signs of increasing instability in the months before the slide, closing and removing a visitor center on thesouthedge of the 2.8-mile-wide, 3,182-foot-deep open pit, which the company claims is the world’s largest manmade excavation.

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