ACQUISITION OF ICG

On June 15, 2011, Arch acquired International Coal Group (ICG). The new Arch Coal is a premier coal company in the U.S. and around the world. We are the second largest met coal supplier as well as the most diversified U.S. producer in the United States. We cemented our place as a top 10 global coal supplier and a top five metallurgical coal producer and marketer.

For ICO shareholders who have questions regarding the conversion of existing ICO shares into cash, please contact Computershare at 1-800-546-5141.

Learn more about the details of the ICG transaction:

Initial Acquisition Materials

5-02-11 News Release

Updates and Financing Announcements

5-16-11 Arch Commences Tender Offer

5-31-11 Arch Commences $2B Senior Notes Offering

5-31-11 Arch Commences Public Offering of Common Stock

6-01-11 HSR Waiting Period Expires

6-08-11 Arch Closes Public Offering of Common Stock

6-14-11 Arch Coal Completes Tender Offer

Acquisition Complete

6-15-11 Arch Coal Completes Acquisition of ICG