Other Professional Activities:

1977, FRAMCO Uranium Exploration Company: Literature search on uranium occurrences in the Rocky Mountain States.

1978, January 11-13; Union Carbide; Presented Short course on the geochemistry of uranium deposits, Grand Junction, Colorado.

1978, June: Anaconda Company; Thermodynamic stabilities of molybdenite, enargite, and other sulfides as they relate to the advanced agrillic alteration at Butte, Montana.

1978, May 22-23; Cotter Corporation; Presented Short course on uranium geochemistry, Golden, Colorado.

1979, January to February; Conoco; Presented Five short courses on uranium geochemistry presented to regional office exploration staffs: Spokane, Washington; Casper, Wyoming; Albuquerque, New Mexico; Austin, Texas; and Denver, Colorado.

1979, March 9; Exxon; Consulted on the geochemistry of uranium, Houston, Texas.

1980, March 23; Wyoming Geological Association; Presented Short course on the geochemistry of uranium, Casper, Wyoming.

1980, May 26-29; Field trip on epithermal gold deposits of Nevada (Steamboat Springs, New Savage and Consolidated Imperial mines, Comstock district; Seven Troughs; Sulphur; McDermitt; Tomboy mine, Battle Mountain district) sponsored by the Society of Economic Geologists.

1981, April 14-16; Presented Short course on the introduction to gold and silver to miners, prospectors, processors, and investors sponsored by Department of Special Programs and Continuing Education, Colorado School of Mines, Golden, Colorado.

1981, April 22-24; Presented Workshop on the geology of massive sulfide, porphyry copper-molybdenum, and volcanic rock-hosted precious metal deposits to Continuing Education Division of the Faculty of Engineering, National Autonomous University of Mexico, Mexico City, Mexico.

1981, August 17-21; Gordon Conference on Inorganic Geochemistry, Geochemistry of Hydrothermal Ore Deposits; Colby-Sawyer College, New London, New Hampshire.

1981, October 1-3; Presented Short course on gold and silver to experience miners, prospectors, processors, and investors sponsored by Department of Special Programs and Continuing Education, Colorado School of Mines, Golden, Colorado.

1981, October 5-7; Presented Paper on solution chemistry of gold and silver and implications for epithermal ore formation; Symposium on zoning in volcanic and subvolcanic mineral deposits, implications for exploration sponsored by University of Nevada-Reno; Lake Tahoe, Nevada; included one day field trip to Steamboat Springs, Geiger Grade and Comstock district.

1982, January 20-21; Homestake Mining Company; Presented Short course on the geochemistry of precious metal deposits; Golden, Colorado.

1982, March 1-2; Marathon Resources; Presented Short course on the geology and geochemistry of precious metal deposits; Denver, Colorado.

1982, April; Presented Short course on introduction to gold and silver to miners, prospectors, processors, and investors sponsored by Department of Special Programs and Continuing Education, Colorado School of Mines, Golden, Colorado.

1982, September 19-24; Field conference on the relationship of mineralization to volcanic evolution in the San Juan Mountains, Colorado, sponsored by Society of Economic Geologists.

1983, January 28; Anaconda Minerals Company; Presented Short course on precious metals geochemistry to Exploration Research Group; Denver, Colorado.

1983, March 21-22; Freeport Exploration Company; Presented Short course on precious metal geochemistry; Reno, Nevada.

1983, April 4-6; Presented Short course on introduction to gold and silver to miners, prospectors, processors, and investors sponsored by Department of Special Programs and Continuing Education, Colorado School of Mines, Golden, Colorado.

1983, November 8-11; Presented Short course on gold and silver to experienced miners, prospectors, processors, and investors sponsored by Department of Special Programs and Continuing Education, Colorado School of Mines, Golden, Colorado.

1984, January 16; Presented Invited half day colloquium on the theoretical aspects on solubility, transport and deposition of gold as part of short course on the exploration for gold deposits sponsored by the Department of Geology, McGill University, Montreal, Quebec, Canada.

1984, February; Presented lecture of the Hydrothermal Geochemistry of Gold in Epithermal Systems: Arizona Geological Society, Tucson.

1984, February 26 to March 5; Los Angeles; Field trip to the Mother Lode gold district sponsored by Society of Economic Geologists, annual meeting of AIME.

1984, March 25-28; Symposium on exploration for ore deposits on the North American Cordillera sponsored by Association of Exploration Geochemists; Technical Session Co-Chairman; Reno, Nevada.

1984, May 15-25; CRA Exploration Limited; Lecturing and consulting on various base and precious metal deposits in New South Wales and Victoria, Australia; visited areas included Sydney, Cobar, Bathurst, Canberra, Melbourne, Bendigo.

1984, October 10; Presented Invited colloquium on the behavior of precious metals in hydrothermal systems to Department of Geology, Oklahoma University, Norman, Oklahoma.

1984, October 30 to November 7; Annual meeting of Geological Society of America; Reno, Nevada; Field trip to sediment-hosted precious metal deposits of Nevada (Pinson, Jerritt Canyon, Maggie Creek, Alligator Ridge, Windfall Taylor silver mine) sponsored by Society of Economic Geologists.

1984, November 12-16; Presented Short course on gold and silver to experienced miners, prospectors, processors, and investors sponsored by Department of Special Programs and Continuing Education, Colorado School of Mines, Golden, Colorado.

1985, January 16-17; Energy Fuels Nuclear, Inc.; Presented Short course on uranium geochemistry; Kanab, Utah.

1985, January 31; Union Oil Company of California; Presented Short course on the geochemistry of precious metals and geothermal brines; Brea, California.

1985, September 7-12; Field trip to gold deposits of Northwest Territories (Lupin, Salmita, Bull Moose) sponsored by Canadian Institute of Mining.

1985, September 23-25; Contributed lectures in international workshop on gold deposit modeling in exploration sponsored by Departments of Geology and Special Programs and Continuing Education, Colorado School of Mines, Golden, Colorado.

1986, February 9-11; Ontario Geological Survey; Presented Short course on geochemistry of gold to Minerals Deposits Section, Toronto, Canada.

1986, March 17-21; Conference on Frontiers in Geology and Ore Deposits of Arizona and the Southwest sponsored by Arizona Geological Society, Tucson, Arizona; Field trip on precious metal mineralization, stratigraphy, and tectonics in southeastern California (Picacho, Cargo-Muchacho; Mesquite).

1986, May 20-25; Annual meeting of Geological Association of Canada, Ottawa, Ontario, Canada; Field trip on structure and gold, Rouyn to Val d'Or, Quebec (Sigma, Bousquet, Malartic, Bousquet-Cadillac) sponsored by Geological Association of Canada.

1986, September 28 to October 1; Gold '86 International Symposium on the Geology of Gold Deposits, Toronto, Canada; Technical Session Co-Chairman.

1987, April; BHP-Utah International; Presented workshop on gold geochemistry, Park City, Utah.

1988, May 12-13; Western Mining Corporation; Presented workshop on precious metal geochemistry, Melbourne, Australia.

1988, May 25; Presented Workshop on the geochemistry of gold and silver presented to the Eastern Goldfields Geological Discussion Group, Kalgoorlie, Western Australia.

1990-1992; Newmont Exploration Limited; petrography and geochemistry of gold ores from the Carlin Trend.

1996, Jan 25-26; Mayfield Distinguished Lecturer, Bowling Green State University, Bowling Green Ohio.

1996, June 28; The Geochemistry and Origin of Epithermal Precious metal Deposits presented to the Instititute of Geology and Mining, Porto, Portugal.

1998, May 11-15; Workshop on the geology and geochemistry of sediment-hosted and epithermal precious metals deposits to Institute of Geology and Mineralogy, Lisbon, Portugal.

2000-2001; White and Steele Attorneys at Law - Consultant; Slope stability in lands disturbed by mining in an epithermal gold district.