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. Twin Metals Minnesota has formally submitted a plan to regulators for the underground copper-nickel mine. The filing launches what's expected to be a lengthy environmental review and permitting process for what would be Minnesota's second copper-nickel mine. (AP Photo/Steve Karnowski, File)
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