WELLINGTON, Utah, Sept 09, 2010 -- Arch Coal's Canyon Fuel Company subsidiary today announced that its Dugout Canyon mine in Carbon County, Utah, has restarted its longwall mining system and is in the process of resuming production.

After production was interrupted on June 22, the company worked closely and cooperatively with the Mine Safety and Health Administration (MSHA) to assess the situation and restart the mine. "We want to extend our great appreciation to the MSHA team for its diligence and hard work during the outage," said Gene DiClaudio, president of Arch Western Bituminous Group.

More than 100 of Dugout Canyon's 275 employees are returning from other company operations in Utah and Colorado where they had been working on temporary assignment. "We were pleased so many Dugout employees offered to work at other locations while the mine was idle," said DiClaudio.

Dugout Canyon mine produces approximately 2 percent of Arch's total annual output. Arch's Canyon Fuel Company is the largest coal producer in Utah and operates the Sufco, Skyline and Dugout Canyon mines with a total workforce of approximately 800.

St. Louis-based Arch Coal, Inc. (NYSE: ACI) is the second largest U.S. coal producer. Through its national network of mines, Arch supplies cleaner-burning, low-sulfur coal to fuel roughly 8 percent of the nation's electricity. The company also ships coal to domestic and international steel manufacturers as well as international power producers.

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