EXHIBIT 4.6 Assignment of Right to Maintain a Non-Voting Observer at Meetings of the Board of Directors of Arch Coal, Inc. This Assignment of October 15, 1998, between the assignor, Carboex International, Limited ("CIL"), a company organized under the...Assignment of Right to Maintain a Non-Voting Observer • March 2nd, 1999 • Arch Coal Inc • Bituminous coal & lignite surface mining
