| SIC* | Company Name** | Wyoming Locations |
| 1221 | Amax Coal West Inc. | Gillette |
| 1459 | American Colloid Minerals Co. | Lovell, Colony, Upton |
| 1311 | Amoco Production Company | Statewide |
| 1381 | Caza Drilling Inc. | Statewide |
| 1221 | Cordero Mining Co. | Gillette |
| 1222 | Cyprus Shoshone Coal Corp. | Hanna |
| 1474 | General Chemical Soda Ash | Green River |
| 1221 | Kennecott Energy Company | Gillette |
| 1221 | Kerr Mcgee Coal Corp. | Gillette |
| 1311 | Marathon Oil Co. | Statewide |
| 1221 | Pacific Minerals Inc. - Rock Springs | Rock Springs |
| 1221 | Powder River Coal Co. | Gillette, Wright |
| 1381 | S S T Energy Corp. | Casper |
| 1474 | Solvay Minerals Inc. | Green River |
| 1221 | The Pittsburg & Midway Coal Mining Co. | Kemmerer |
| 1221 | Thunder Basin Coal Co. | Wright |
| 1221 | Triton Coal Co. | Gillette, Wright |
* Standard Industrial Classification code. See
Appendix C for description.
** Employers are listed in alphabetical order.
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