| Title | Subsidiary |
| Start Date | 1975-00-00 |
| End Date | 1997-07-00 |
| Is Current | no |
| Percent Stake | 100% |
| Notes | Arch Coal was formed in July 1997 through the merger of publicly traded Ashland Coal, Inc. and privately held Arch Mineral Corporation. Arch Mineral had its origins in 1969, when it was formed as a partnership between Ashland Oil (now Ashland Inc.) and the Hunt family of Dallas, Texas; Ashland Coal was formed in 1975 as a wholly owned subsidiary of Ashland Oil. |