Minnesota Pollution Control Agency issues copper-nickel mine permits

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DULUTH — The Minnesota Pollution Control Agency issued its environmental permits for PolyMet’s copper-nickel mine near Hoyt Lakes Thursday, Dec. 20, bringing the contentious project one step closer to fruition....

PolyMet will use rod mills, at right, to crush metal-bearing rock from 1/2-inch-sized pieces to small pieces of gravel as part of the process of extracting copper, nickel and other metals from the mine. The mills are part of the old LTV processing plant now owned by PolyMet. File photo by Bob King

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