WELLINGTON, Utah, May 21, 2010 -- Arch Coal's Canyon Fuel Company subsidiary announced that its Dugout Canyon Mine in Carbon County, Utah, has resumed coal production with all mining equipment, including the main longwall mining system.

Mine crews recently completed permanently sealing a mined-out area where increased levels of carbon monoxide were detected on April 29. The company wishes to thank the Mine Safety and Health Administration (MSHA) for their technical support and assistance in resolving this situation in a safe and responsible manner.

Dugout Canyon mine and its 275 employees produced approximately 200,000 tons of low-sulfur bituminous coal per month in the first quarter of 2010, which equates to about 2 percent of Arch's total production.

St. Louis-based Arch Coal 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.