ST. LOUIS (February 7, 2006) - Arch Coal, Inc. (NYSE: ACI) now offers podcasting and RSS feeds - the latest on-the-go technology - for the replay of its quarterly earnings conference calls.

Investors can download the MP3 audio file known as a "podcast" from Arch Coal's Web site to a personal computer, and then transfer it to an iPod or other MP3 player using a podcasting software application. The conference call replay is then portable, allowing investors to listen on the go.

RSS technology works in much the same way as podcasting. Unlike podcasting's on-demand approach, the RSS feed automatically alerts subscribers that new audio files are available.

Arch Coal believes podcasting and RSS will help fulfill its investors' need for information whenever and wherever they choose. The company constantly strives to harness new technologies to improve its business practices, whether the application is a process improvement initiative for mining or an additional communications tool for the investment community.

Arch Coal's fourth quarter 2005 investor conference call will be webcast live at 11:00 a.m. Eastern Time on Friday, Feb. 10. Following the call, the podcast will be available at www.archcoal.com.

St. Louis-based Arch Coal is the nation's second largest coal producer and mines cleaner burning, low-sulfur coal exclusively. Through its subsidiary operations in Wyoming, Colorado, Utah, West Virginia, Kentucky, and Virginia, Arch provides the fuel for approximately 6 percent of the electricity generated in the United States. Arch Coal was recently named one of the Web Smart 50 by Business Week and also earned a place on the CIO 100 lists in 2005 and 2003 for its bold and innovative use of new technologies.