ST. LOUIS/ Feb. 24 – Arch Coal, Inc. (NYSE: ACI) today announced Thomas A. Lockhart, 67, has been elected to its board of directors effective immediately. Mr. Lockhart will serve on the board’s finance and personnel and compensation committees.

“I’m pleased Tom Lockhart has joined our board of directors,” said Steven F. Leer, Arch Coal’s president and chief executive officer. “Tom’s wealth of knowledge regarding western energy markets will prove especially helpful in shaping our company’s strategies going forward.”

Mr. Lockhart currently is a member of the Wyoming State House of Representatives where he serves on the Revenue and Education Committees. He also serves on the Board of Directors for the University of Wyoming’s Institute of Environment and Natural Resources.

Previously, Mr. Lockhart spent 31 years with PacifiCorp, one of the West’s largest electric utilities. Prior to his retirement in 1998, he was responsible for helping negotiate the merger of Pacific Power with Utah Power and served as vice president of power systems for PacifiCorp’s electric operations in Portland, Ore.

Mr. Lockhart holds a bachelor of science degree in electrical engineering from the University of Wyoming and an M.B.A. from Portland State University. He was inducted into the University of Wyoming College of Engineering Hall of Fame in 2002.

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 6 percent of the electricity generated in the United States.