AMAX Coal Corporation
Ames Construction
Amoco
Anadarko
Anschutz Exploration
ARCH Mineral
Barrett Resources
Belle Ayr Mine
BHP Minerals Corporation
BP
Buckskin Mine
Burlington Northern Railroad
Carbon Coal Company/Cyprus –Shoshoni Coal
Colorado Interstate Gas
Conoco
Decker Coal Mine
Dryfork Mine
Eagle Butte Coal Mine
El Paso Natural Gas Pipeline Company
Freeport McMoRan
Gilbert Western/Peter Kiewit Corp.
High Plains Construction Company
Jacobs Ranch Mine Coal Company
Kennecott Utah Copper
Kerr McGee Corporation
Kinder Morgan
KN Energy
LaFarge, Inc.
Martin Marietta
McGarvin-Moberly Construction
Northwinds of Wyoming
Oftedal & Sons, Incorporated
Pacificorp
Peabody Western Coal Company
Pete Lien & Sons
Peter Kiewit
Petrotomics Company
Phelps-Dodge Mining Company
Powder River Coal Company
Rawhide Mine
Reiman Corporation
Shell Oil Company
Simon Contractors
TetraTech Corporation
Texaco
TIC, Incorporated
Triton Coal Company
Union Pacific Railroad
and hundreds of other Mines, Contractors, Construction Companies, and Government Entities