ST. LOUIS (August 12, 2005) – Arch Coal, Inc. (NYSE:ACI) today announced that David N. Warnecke has been named vice president of marketing and trading for the company, effective immediately. Warnecke will report to John W. Eaves, Arch's executive vice president and chief operating officer.

"In his expanded new capacity, Dave will lead the marketing and trading efforts across the entire breadth of Arch's national and international market area," Eaves said. "Through Dave's leadership, I am confident that Arch will build on its position as a preferred supplier to the nation's utilities and power generators, while capitalizing on the many value-creating opportunities in today's dynamic energy markets." Warnecke will join Arch's senior officer team, which has responsibility for strategy development, policy formation and capital allocation.

In May 2005, Warnecke was named president of Arch Coal Sales, Arch's sales and marketing subsidiary, and he will continue to hold that position. Prior to that time, Warnecke had served as executive vice president of sales and trading for Arch Coal Sales since 2003. He also has held the positions of president of Arch Transportation and mine manager for Arch's former Pikeville, Kentucky, operation during his more than 20 years with the company. In addition, Warnecke served as manager of crude oil trading for Clark Oil from 1992-1995. A native of southern Illinois, Warnecke holds a B.S. in Accounting from McKendree College in Lebanon, Illinois.

In other developments, Deck S. Slone also has been named to the company's senior officer team and will report directly to Steven F. Leer, Arch's president and chief executive officer. Slone is vice president of investor relations and public affairs, a position he has held since 2001. In this capacity, Slone has responsibility for the company's investor relations and corporate communications functions, and also is engaged in Arch's government affairs efforts. In addition, he serves on Arch's technology committee, which has responsibility for assessing and selecting new investment and partnership opportunities in the energy-related technology arena. A native of Ashland, Kentucky, Slone holds a B.A. from Vanderbilt University and an M.B.A. from Washington University in Saint Louis. He joined Arch Coal in 1997.

St. Louis-based Arch Coal is the nation's second largest coal producer and mines low-sulfur coal exclusively. Through its subsidiary operations in West Virginia, Kentucky, Virginia, Wyoming, Colorado and Utah, Arch provides the fuel for approximately 7 percent of the electricity generated in the United States.