DENNIS T. TREXLER
115 Blair Place
Reno, NV 89509
Phone – FAX (775) 829-2821
email DTrexler@Charter.net
Education:
BS--Geology, University of Southern California, 1965
MS--Geology, University of Southern California, 1968
Post Graduate Courses: Remote Sensing, 1968; Advanced Geology of Nevada, 1971; Groundwater
Geology, 1973; Earthquake Engineering, 1973; Personnel Management, 1981
Registration:
Nevada: Certified Environmental Manager, EM-1297 (since 1993)
California: Registered Geologist, No. 2382 (since 1967)
Experience:
1997 – Present
Geologic and Environmental Consultant:
Continue consulting to industry on geothermal resource assessments for both power production and direct use.
Prepared a geothermal assessment report and sub-contracted a ground magnetic survey at Darrough’s Hot
Springs for Smoky Valley Geothermal. I am Vice President of Operations for Nevada Geothermal Utility, Inc.,the
largest privately held geothermal space heating utility in Nevada. I was Exploration Manager for Lake City
Geothermal LLC in 2001 and 2002. Duties included contracting for an eleven line-mile seismic reflection survey
performed by Optim and manage drilling of a 3400 ft. core hole to evaluate volcanic stratigraphy and measure
down-hole temperature. Consulting geologist for geothermal resource providing energy to Empire Geothermal
Power plant. In 2003, I prepared a report evaluating the geothermal resource at Nevada Geothermal Utilities
Company’s space heating district (Moana area) for potential buyers. I have consulted for private energy
developers at various sites in the western U. S. These confidential reports were prepared for Big Smoky Valley
(Darrough’s Hot Spring), Fish Lake Valley, New Castle, Utah, Stillwater, Beowawe, Pyramid Lake Indian
Reservation, Guisti Property Steamboat Hot Springs, Geothermal Development Associate’s Lease at Steamboat
Hot Springs, Hazen, Humboldt House, Gerlach, and San Emidio Desert Known Geothermal Resource Areas.
Also consulted on environmental issues related to geothermal energy. Performed an environmental audit of
Empire Geothermal Power Plant refinancing for CoBank. Prepared an Environmental Assessment (EA) for
surface discharge of total production from the San Emidio geothermal resource to evaluate the effects of
geothermal fluid injection on production temperature decline.
1981 - 1997
Director: Division of Earth Sciences, Harry Reid Center for Environmental Studies, University of Nevada, Las
Vegas,
Develop, administer and participate in research programs concerning utilization of natural resources and re-use
of waste streams in Nevada. Performed research, on the use of municipal biomass in mined land reclamation
and use of liquid effluent in forage crop production. Previous research included mineral processing using
geothermal heat, core-drilling in volcanic terranes and Geothermal Reservoir Characteristics and Hydrothermal
Fluid Genesis Associated with Magmatic Activity in Eastern California and Western Nevada in conjunction with
California Division of Mines and Geology. As an extension of this latter work, I was involved in the investigation
of deep-seated geothermal resources in Japan and comparison with deep resources in the western United
States. The Division performed resource assessments of geothermal resources in Nevada and California that
were not being evaluated as high temperature resources by industry.
Funding, for these programs, was obtained from federal, state and private industry sources, and required
proposal preparation, contract management and supervision of research, including subcontracting,
procurement of equipment and services, and report preparation.
1974-1981
Research Associate/Geologist: Nevada Bureau of Mines and Geology, University of Nevada, Reno.
I was Principal Investigator or co-principal investigator in numerous research programs of interest to the Nevada
Bureau of Mines and Geology. The programs included:
1) a six-year Earthquake Hazards Reduction program funded by the U.S. Geological Survey,
2) a three-year National Uranium Resources Evaluation funded by Lawrence Livermore Laboratory, and
3) a five-year program in geothermal assessment funded by the U.S. Department of Energy.
1971-1974
Research Associate: Mackay School of Mines, University of Nevada, Reno.
Duties included coordination and interpretation of remote sensing data acquired by high altitude aircraft and
Skylab in relation to natural resources in the Great Basin. Interpretation included evaluating Skylab
photographic imagery for lithologic, structural and geomorphic data and the cost-benefits derived; also
performed research in applications of remote sensing techniques to solve geologic and natural resources
problems.
1970-1971
Manager of Earth Resources Applications: Microwave Sensor Systems Division of Spectran. Inc., La Palma,
California.
Conducted investigations on the detection and discrimination of oil spills using multi-spectral photography, 8-
13.5 micron infrared and multi-frequency microwave radiometer data.
1968-1970
Staff Geologist: Aerojet-General Corporation, Space Division, Azuza, California.
Responsibilities included the development of passive microwave techniques for earth resources. I participated
as either Project Engineer or Program Manager on research programs for the, U. S. Geological Survey, Office
of Naval Research, and U.S. Coast Guard.
1967-1968
Engineering Geologist: Geolabs. Inc., Santa Ana, California.
Duties entailed site evaluation for engineered structures and preparation of geologic reports for Los Angeles
and Orange counties, California.
1966-1967
Engineering Geologist: State of California, Department of Water Resources, Los Angeles.
While assigned to the planning and special investigations branch, duties included interpretation of ground water
basin characteristics from exploratory drilling, preparation of ground water basin simulation by digital computer
models and a survey of the impact of degradation of water quality on industry in the Chino Basin, Los Angeles
and Riverside counties.
Special Awards and Honors:
Mobil Oil Scholarship, 1963
Mobil Oil Scholarship, 1964
Dean List, University of Southern California, 1962, 1963, Fall 1964
W.A. Tarr Award, Sigma Gamma Epsilon Scholastic Achievement, 1965
National Science Foundation, Research Assistant, 1966
Membership in Professional Organizations:
American Society of Mining and Reclamation
Geothermal Resources Council
Geological Society of Nevada
PUBLICATIONS LIST (last 26 years)
Trexler, D. T., 1998, Nevada Power Plant Boosts Output 318%; GRC Bulletin, v. 27, n.2, p. 40.
Trexler, D. T., 1997, Age of Geomorphic Surfaces in the Southern Walker Lake Basin; report to Division of
Environmental Assessment, HRC, Univ. of Nevada, Las Vegas, 27p.
Trexler, D. T., Taylan, Genaro, Stewart, M. B., and Baker, Scott, 1995, Gunion - Nevada's Most Innovative Food
Dehydration Facility; Geothermal Resources Council TRANS., v. 19, p. 85.
Flynn, Thomas, Trexler, D. T. and Hendrix, J. L., 1995, Application of Geothermal Energy to Mineral Processing:
Cyanide Heap-leaching of Low-grade Ore: Circum-Pacific Council on Energy & Min. Resources, Earth Sci. Ser.
v. 16, p. 277-282.
Loomis, David, DeLaureal, James, McCaa, Craig and Trexler, Dennis, 1993, Municipal sludge biosolids in mine
land reclamation: Great Basin pilot study: Mining Engineering, p.1470-1472.
Trexler, D. T., Miller, J. D., Flynn, Thomas and Buchanan, P. K., 1992, Opportunities to Enhance Mine Land
Reclamation Using Municipal Biosolids: Sympos. Proc. Mined Land Reclamation; What Works, May, 1992,
Reno, NV.
Trexler, D.T., Flynn, Thomas and Hendrix, J.L., 1991, Direct Application of Geothermal Fluids in Cyanide Heap-
leaching Operations; U. S. Bur. of Mines Report of Research, 86p.
Trexler, D.T., Flynn, Thomas and Hendrix, J.L., 1990, Preliminary Results of Column Leach Experiments at two
Gold Mines Using Geothermal Fluids: Geothermal Resources Council TRANS. v. 14, p. 351-358
Melhorn, W.N., Trexler, D.T. and Thomas, D. Hurst, 1988, Chapter 3 The Archaeology of Triple T Shelter
(Ny345); Physical Stratigraphy (p. 242-249): in Thomas, D. Hurst, The Archaeology of Monitor Valley: 3. Survey
and Additional Excavations; Anth. Paper, American Museum of Nat. Hist., v. 66, Part 2
Trexler, D.T., Flynn, Thomas, and Hendrix, J.L., 1987, Enhancement of Precious Metal Recovery by Geothermal
Heat: Geothermal Resource Council TRANS., v. 11, p. 15-21.
Flynn, Thomas and Trexler, D.T., 1987, Comparative Analysis of Core-Drilling and Rotary-Drilling in volcanic
Terrane: NTIS No. DOE/SF/16609.
Flynn, Thomas, Trexler, D.T., and Hendrix, J.L., 1986, Geothermal Enhancement of Mineral Processing in
Nevada: NTIS. No. DOE/SF/15603-1.
Trexler, D.T., and Melhorn, W.N., 1986, Singing and Booming Sand Dunes of California and Nevada: California
Geology, July, 1986, p. 147-152.
Trexler D.T., Flynn, T., Ghusn, G., Jr., and Gerrard, C., 1985, AEIOU: Accelerated Exploration for Integrated
and Optimal Utilization: A Strategy for Geothermal Resource Development at Department of Defense
Installations: Geothermal Resource Council TRANS., v. 9, p. 73-80.
Higgins, C.T., Flynn, T., Chapman, R.H., Trexler, D.T., Chase, G.R., Bacon, C.F., and Ghusn, G., Jr., 1985,
Geothermal Systems of the Mono Basin Long Valley Region, Eastern California and Western Nevada: California
Div. of Mines and Geol., Open-file Report 85-19SAC.
Trexler, D.T., and Flynn, Thomas, 1984, Geothermal energy development in Nevada's Great Basin: Geothermal
Resources Council Bull., v. 13, no. 9.
Trexler, D.T., Flynn, T., and Ghusn, G.E., Jr., 1984, Geothermal resources of Nevada: A new map: Geothermal
Resources Council, TRANS., v.8, p. 475-476.
Flynn, T., Ghusn, G., Jr., and Trexler, D.T., 1984, Geothermal Fluid Disposal Options for Marine Air Ground
Combat Center, Twentynine Palms, California: Report prepared for the Department of the Navy, Naval
Weapons Center, China Lake, California, 47 p.
Trexler, D.T., Flynn, T., and Ghusn, G., Jr., 1984, Drilling and Thermal Gradient Measurements at U.S. Marine
Corps Air Ground Combat Center, Twentynine Palms, California: Final Report for U.S. Dept. of Energy, Contract
No. DEAC03-83SF11956, 79 p.
Fultz, L.A., Bell, E.J., and Trexler, D.T., 1984, Geochemistry, Age and Strontium Isotope Composition of Late
Tertiary and Quaternary Basalts and Andesites in western Nevada and their relation to Geothermal Potential:
Final Report, U.S. DOE contract
No. AC03-82RA50075.
Melhorn, W.N., and Trexler, D.T., 1983, Chapter 2 Geology and Geomorphology of Mill Canyon (p. 29-32);
Chapter 3 Geology of Gatecliff Shelter: Physical Stratigraphy (p. 39-46); Chapter 5 Interpretations (p. 88-96); IN
Thomas, D. Hurst, The Archaeology of Monitor Valley, 2. Gatecliff Shelter; Anth. Paper, American Museum of
Nat. Hist., v. 59, Part 1.
Melhorn, W.N., and Trexler, D.T., 1983, Geology and Geomorphology of Monitor Valley; ch. 6, p. 92-98: IN
Thomas, D. Hurst, The Archaeology of Monitory Valley; Anth. Paper, Amer. Museum of Nat. Hist., v. 58, Pt. 1.
Fultz, L.A., Bell, E.J., and Trexler, D.T., 1983, Volcanic Rock Petrochemistry as an Exploration Technique for
Geothermal Energy: Geothermal Resources Council Trans., v. 7, p. 289-294.
Trexler, D.T., Flynn, T., Koenig, B.A., and Ghusn, G.E., Jr., 1983, Geothermal Resources of Nevada: National
Oceanic and Atmospheric Administration Map
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