- Alberta Energy Company Ltd
- Altamont Gas Transmission Company
- AMEC Earth and Environmental, Inc.
- Amoco Minerals Company
- Anaconda Minerals
- Apollo Gold
- Applied Geology Associates, Ltd. (N2)
- Aqua Terra
- Ardic Exploration
- ASARCO, Inc.
- Ash Grove Cement
- Baukol-Noonan, Inc.
- Beal Mountain Mining Company
- Big Horn Calcium Company
- Bison Engineering, Inc.
- BMP Investments
- BMP Power
- Chen-Northern, Inc.
- Coal Creek Mining Company
- Confidential Clients
- Conoco - Phillips
- Crown Butte Resources, Inc.
- Cyprus Coal Company
- Cyprus Industrials Minerals Company
- Cyprus Shoshone Coal Company
- Dames & Moore
- Damschen (Entranco)
- Decker Coal Company
- Divide Coal Company
- Duke Energy
- Eckhoff, Watson and Preator
- Encoal
- Envirocon
- Essex Environmental
- Express Pipeline
- Exxon
- Falcon Flight, Inc.
- Ford, Bacon & Davis
- Forsgren Associates, Inc.
- Gallatin Valley Land Trust
- GeoResearch, Inc.
- Georgia Strait Crossing Pipeline LP
- Golden Sunlight Mines, Inc.
- Golder Associates
- Great Divide Ski Area
- Great Northern Properties LP
- Harding-Lawson Associates
- Homestake Mining Company and American Copper and Nickel Company
- Hydrometrics, Inc.
- Idaho Gold Corporation
- Kendall Venture
- Knife River Coal Mining Co.
- Kolowich Development
- Landusky Mining Company
- Louisiana Land and Exploration
- Maxim Technologies
- Meridian Minerals
- Merjent
- Mines Management, Inc.
- Montana Army National Guard
- Montana Department of Health and Environmental Sciences Water Quality Bureau
- Montana Department of Natural Resources and Conservation
- Montana Department of State Lands
- Montana Department of Transportation
- Montana Natural Heritage Program
- Montana Tunnels Mining, Inc.
- Montco
- Morrison-Maierle
- MSE-HKM
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- Nance Brown Fee Coal Properties
- Nevada Spring Creek Partners, LLC
- Nevada Power
- Noranda Minerals Corporation
- Norris Gold Inc.
- Northland Engineering & Surveying
- Northwest Hydro-electric
- Northwest Pipeline Corporation
- NorthWestern Energy Company
- Northwestern Resources Company
- OEA Research, Inc.
- Olympus Technical Services
- Peabody Coal Company
- Pegasus Gold Corporation
- Pentacore
- PG&E Gas Transmission Northwest
- P-M Coal Mining Company
- PRC
- Prickly Pear Land Trust
- Radersburg Mining Company
- RC Resources
- Resource Management Associates
- Revett Silver Company
- Rhone Poulenc
- Ridgway School District
- Rock Creek Cattle Company
- Santa Fe Pacific
- Seven-Up Pete Joint Venture
- Shell Mining Company
- Shell Oil Company
- Sierra Pacific Power Company
- Sierra Pacific Resources
- Southern Utah Fuel Company
- Spectrum Engineering
- Stearns-Roger, Inc.
- Sterling Mining Company
- Stillwater Mining Company
- Swift and Company
- Tennaco
- TERA Environmental Consultants
- Terasen Pipelines, USA
- Terracon
- Teton Pass Ski Area
- Tetra Tech EM, Inc.
- The Nature Conservancy
- Thomas, Dean & Hoskins
- TR Railroad Inc.
- TransColorado Gas Transmission Company
- Triad Investments, Inc.
- Triton Coal Company
- Trout Unlimited
- Trow Engineering Consultants
- TransCanada Pipeline, Ltd.
- Tuscarora Gas Transmission Company
- U.S. Bureau of Land Management
- U.S. Department of State
- U.S. Federal Energy Regulatory Commission
- U.S. Forest Service
- U.S. Geological Survey
- United Catalysts, Inc.
- Vidler Water Company
- Wesco Resources
- Western Energy Company
- Westmoreland Resources
- Williams Gas-Northwest Pipeline
- Willow Creek Talc, Inc.
- Wyoming Water Development Commission
- Yellowstone Coal Company
- Yellowstone Pipeline Company
- Zeigler Coal
- Zortman Mining Company
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