The former Berkeley Pit copper mine, now an environmental clean-up site, in Butte, Mont. CREDIT: ISTOCK/PHIL AUGUSTAVO

The former Berkeley Pit copper mine, now an environmental clean-up site, in Butte, Mont. CREDIT: ISTOCK/PHIL AUGUSTAVO
By Magda Gardner December 29, 2020 At 2:48 pm
The former Berkeley Pit copper mine, now an environmental clean-up site, in Butte, Mont. CREDIT: ISTOCK/PHIL AUGUSTAVO

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