A shovel prepares to dump a load of coal into a 320-ton truck at the Arch Coal Inc.-owned Black Thunder mine in Wright, Wyo., on April 30, 2007. (Associated Press) **FILE**
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A shovel prepares to dump a load of coal into a 320-ton truck at the Arch Coal Inc.-owned Black Thunder mine in Wright, Wyo., on April 30, 2007. (Associated Press) **FILE**
