ST. LOUIS (August 30, 2006) – Arch Coal, Inc. (NYSE:ACI) today announced that its Chairman and Chief Executive Officer, Steven F. Leer, will speak at the Lehman Brothers CEO Energy/Power Conference in New York City on Thursday, Sept. 7, 2006.

Interested investors may access a live audio webcast of the presentation at 1:45 p.m. E.T. on Sept. 7 at Arch Coal's Web site at www.shareholder.com/archcoal/events.cfm. A replay of the webcast also will be available at the same URL for 30 days.

St. Louis-based Arch Coal is the nation's second largest coal producer. Through its national network of mines, Arch Coal provides the fuel for approximately 6% of the electricity generated in the United States.