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FILE - In this Oct. 4, 2011, file photo, a core sample drilled from underground rock near Ely, Minn., shows a band of shiny minerals containing copper, nickel and precious metals, center, that Twin Metals Minnesota LLC, hopes to mine near the Boundary Waters Canoe Area Wilderness in northeastern Minnesota. Minnesota officials say they will do a state environmental impact statement for a proposed copper-nickel mine upstream of the Boundary Waters Canoe Area. (AP Photo/Steve Karnowski, File)

FILE - In this Oct. 4, 2011, file photo, a core sample drilled from underground rock near Ely, Minn., shows a band of shiny minerals containing copper, nickel and precious metals, center, that Twin Metals Minnesota LLC, hopes to mine near the Boundary Waters Canoe Area Wilderness in northeastern Minnesota. Minnesota officials say they will do a state environmental impact statement for a proposed copper-nickel mine upstream of the Boundary Waters Canoe Area. (AP Photo/Steve Karnowski, File)

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