ST. LOUIS (November 21, 2006) – Arch Coal, Inc. (NYSE:ACI) today announced that it earned a place in the 16th Annual Triad Top Ten for its most recent annual report to shareholders among more than 800 Midwest public companies.

The Triad Awards Report Program is sponsored and underwritten by three independent organizations: National Investor Relations Institute-Chicago, the American Institute of Graphic Arts (AIGA) and DePaul University's Department of Finance. Annual reports are solicited anonymously for the judging process from all publicly traded companies in eight Midwestern states: Illinois, Indiana, Iowa, Michigan, Minnesota, Missouri, Ohio and Wisconsin. Arch Coal joins Chiquita Brands, Harley-Davidson and Miracle-Gro as some of this year's Triad winners.

"We're honored to be recognized among the Triad Top Ten," said Deck S. Slone, vice president of investor relations and public affairs. "Arch Coal is committed to creating value for all of our stakeholders, and we view our annual report as a prime opportunity to get our message out."

Arch Coal's 2005 annual report – with the theme "Coal is green" – featured content and images emphasizing Arch's status as a world-class producer of clean-burning, low-sulfur coal. "Our 2005 report highlights the evolving role of coal as a 21st Century energy source, and Arch Coal's growing stature as a vital, progressive and responsible energy company."

Arch Coal and its design firm, Kolbrener, Inc., also won a Davey Award (Gold) and an American Design Graphic Award for the 2005 report. The Davey Awards are sponsored by AdWeek, Fortune Small Business, The Creative Group and OnRequest Images and the 3,500 entries are judged by the International Academy of Visual Arts. The American Design Graphic Award is sponsored by Graphic Design USA magazine and Adobe Systems Incorporated.

St. Louis-based Arch Coal is the nation's second largest coal producer. The company's core business is providing U.S. power generators with clean-burning, low-sulfur coal for electric generation. Through its national network of mines, Arch supplies the fuel for approximately 6 percent of the electricity generated in the United States. The award-winning annual report is available online at http://investor.archcoal.com/annuals.cfm.