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FILE - This Dec. 14, 2016 file photo shows Berkeley Pit in Butte. Atlantic Richfield wants to build a second treatment plant to lower the level of acidic, metal-laden water that has collected in a former mining pit in Butte that was closed more than 35 years ago, The Montana Standard reported Wednesday, May 29, 2019.   (AP Photo/Matt Volz, File)

FILE - This Dec. 14, 2016 file photo shows Berkeley Pit in Butte. Atlantic Richfield wants to build a second treatment plant to lower the level of acidic, metal-laden water that has collected in a former mining pit in Butte that was closed more than 35 years ago, The Montana Standard reported Wednesday, May 29, 2019. (AP Photo/Matt Volz, File)

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