ST. LOUIS, Sept. 19, 2011 -- Arch Coal, Inc. (NYSE: ACI) today announced that it has published its third social responsibility report, Our Charge, online at http://responsible.archcoal.com.

The report highlights Arch's 2009-2010 efforts and follows Global Reporting Initiative (GRI) G3 level C guidelines. In the web-based report, Arch has expanded its quantitative reporting and added key stakeholder engagement, public policy positions and related video narratives.

"Our charge as a forward-thinking energy supplier is to help meet the world's growing energy needs in a careful and responsible manner," said Steven F. Leer, Arch's chairman and chief executive officer. "While it is rewarding to reflect on the impressive records and significant accomplishments highlighted in this report, we are focused on continuous improvement in all phases of our business as we lead our company and our industry forward."

U.S.-based Arch Coal is a top five global coal producer and marketer, with 179 million tons of coal sold pro forma in 2010. Arch is the most diversified American coal company, with mining complexes across every major U.S. coal supply basin. Arch's core business is supplying cleaner-burning, low-sulfur thermal and metallurgical coal to power generators and steel manufacturers on four continents. In 2010, Arch set new company records in safety performance, environmental compliance and revenue generation.