FILE - In this April 2007, file photo, a shovel prepares to 

FILE - In this April 2007, file photo, a shovel prepares to dump a load of coal into a 320-ton truck at the Black Thunder Mine in Wright, Wyo. Lawmakers asked the U.S. Department of Interior on Friday, Jan. 4, 2013 to review whether companies are shortchanging federal and state governments out of millions of dollars in royalties on coal exported to foreign markets. A spokesman for Wyoming Gov. Matt Mead, a Republican, said state officials there had seen no evidence that companies had failed to pay their proper royalties. (AP Photo/Matthew Brown, File)
Associated Press
FILE - In this April 2007, file photo, a shovel prepares to dump a load of coal into a 320-ton truck at the Black Thunder Mine in Wright, Wyo. Lawmakers asked the U.S. Department of Interior on Friday, Jan. 4, 2013 to review whether companies are shortchanging federal and state governments out of millions of dollars in royalties on coal exported to foreign markets. A spokesman for Wyoming Gov. Matt Mead, a Republican, said state officials there had seen no evidence that companies had failed to pay their proper royalties. (AP Photo/Matthew Brown, File)
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