Development Wells At Long Valley Caldera Geothermal Area (Holt & Campbell, 1984)

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Exploration Activity: Development Wells At Long Valley Caldera Geothermal Area (Holt & Campbell, 1984)

Exploration Activity Details
Location Long Valley Caldera Geothermal Area
Exploration Technique Development Wells
Activity Date 1983 - 1985

Usefulness useful
DOE-funding Unknown

Exploration Basis
After 1983, several full sized production and injection wells were drilled within the caldera to the east of Highway 395.
These included two injection wells (IW-1, IW-2) and four production wells (MBP-1, 2, 3, and 5) drilled at Casa Diablo to support the MP-I geothermal power plant, a joint venture between Mammoth Binary Power Company and Pacific Energy Resources Inc.[1] [2] [3] These wells exhibited temperature profiles similar to that encountered in the upper 300 m of (Unocal) Mammoth-1. Successful construction of the MP-I power plant in 1985 by Kennebec Construction Company (a subsidiary of The Ben Holt Co., who designed the facility) marked the completion of the world's first air-cooled binary cycle geothermal power plant.[4]


Additional References
  1. Christopher D. Farrar,Michael L. Sorey,S.A. Rojstaczer,Cathy J. Janik,Robert H. Mariner,T.L. Winnett,M.D. Clark. 1985. Hydrologic and Geochemical Monitoring in Long Valley Caldera, Mono County, California, 1982-1984. (!) : U.S. Geological Survey. Report No.: Water-Resources Investigations Report 85-4183.
  2. Environmental Science Associates. 1987. Mammoth Pacific Geothermal Development Projects: Units II and III. Mono County, CA: Environmental Impact Report, prepared for Energy Management Department.
  3. EGS Inc.. 2012. Technical Geologic Overview of Long Valley Caldera for the Casa Diablo IV Geothermal Development Project. San Francisco, CA: Prepared for Geologica Inc.. Report No.: Appendix D: Geologic and Geothermal Resources Technical Report.
  4. Ben Holt,Richard G. Campbell. 1984. Mammoth Geothermal Project. Geo-Heat Center Quarterly Bulletin. 8(4):17-19.