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FILE - In this Aug. 12, 2015 file photo, water flows through a series of retention ponds built to contain and filter out heavy metals and chemicals from the Gold King mine chemical accident, in the spillway about 1/4 mile downstream from the mine, outside Silverton, Colo. The administration of President Donald Trump is dropping a proposal that would have forced mining companies to prove they have the financial wherewithal to clean up their pollution, Friday, Dec. 1, 2017. (AP Photo/Brennan Linsley, File)

FILE - In this Aug. 12, 2015 file photo, water flows through a series of retention ponds built to contain and filter out heavy metals and chemicals from the Gold King mine chemical accident, in the spillway about 1/4 mile downstream from the mine, outside Silverton, Colo. The administration of President Donald Trump is dropping a proposal that would have forced mining companies to prove they have the financial wherewithal to clean up their pollution, Friday, Dec. 1, 2017. (AP Photo/Brennan Linsley, File)

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