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PolyMet reports breakthrough in getting pollutants out of mining water

PolyMet Mining says tests using reverse osmosis have succeeded in removing sulfates from water. The development could be a key step in removing a top environmental objection to the company's proposed copper mine near Hoyt Lakes.
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PolyMet Mining says tests using reverse osmosis have succeeded in removing sulfates from water. The development could be a key step in removing a top environmental objection to the company's proposed copper mine near Hoyt Lakes.

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