Nickel ore mining usa

nickel ore mining in usa. PolyMet Mine in Northeastern Minnesota | PolyMet Mining. It holds 275 million tons of Proven and Probable Reserves grading 0.28 percent copper and 0.08 percent nickel. The NorthMet deposit, however, contains a total of 694 million tons of Measured and Indicated Mineral Resources grading 0.27 percent copper and 0.08

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