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World's Largest Open Pit Iron Ore MineWORLD'S LARGEST OPEN PIT IRON ORE MINE Located in northern Minnesota Contributed by Rod Judy Ness of Hermantown ...
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PolyMet Mine Proposal | Mining TruthPolyMet's Minnesota mining project proposes to develop an open-pit mine to extract copper, nickel and other metals.
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Open-pit mining - WikipediaOpen-pit, open-cast or open cut mining is a surface mining technique of extracting rock or minerals from the earth by their removal from an open pit or borrow.
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