U.S.-based Arch Coal, Inc. is a top five global coal producer and marketer, with 157 million tons of coal sold in 2011. Arch is the most diversified American coal company, with active mining complexes across every major U.S. coal supply basin. Its core business is supplying cleaner-burning, low-sulfur thermal and metallurgical coal to power generators and steel manufacturers on five continents. Arch's Canyon Fuel Company is Utah's largest coal producer and a large state employer, with a workforce of more than 700. It operates the Dugout Canyon, Skyline and Sufco mines.SOURCE Arch Coal, Inc.