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NEPA Document Collection for: DOI-BLM-CA-170-02-15
EA at Long Valley Caldera Geothermal Area for Geothermal/Exploration

EA for Basalt Canyon Slim Hole and Geothermal Well Exploration Projects at Long Valley Caldera Geothermal Area

General NEPA Document Info
Energy Sector Geothermal energy

Analysis Type



Mammoth Pacific
Consultant EMA Associates

Geothermal Area

Long Valley Caldera Geothermal Area

Project Location


Project Phase



Drilling Methods, Exploration Drilling, Exploratory Well, Slim Holes
Time Frame (days)
NEPA Process Time 77
Participating Agencies

Lead Agency


Funding Agency

none provided

Managing District Office

BLM Central California District Office

Managing Field Office

BLM Bishop Field Office

Funding Agencies

none provided

Surface Manager

Mineral Manager

Selected Dates
Document Type
Scoping Initiated Date 2001/12/06
Preliminary EA-EIS Date 2001/12/06
Final EA-EIS Date
/Public Comment Period
Decision Document Date 2002/02/21
Relevant Numbers
Lead Agency
Doc Number
Lease Numbers

Proposed Action

Mammoth Pacific, LP, is proposing to conduct two geothermal resource exploration drilling projects on portions of two existing federal geothermal resource leases, CA-1667 and CA-14408, within the Mono-Long Valley KGRA. MPLP has submitted two plans of operation to conduct geothermal resource exploration drilling operations on portions of two federal geothermal resource leases, CA-11667 and CA-14408, within the Mono-Long Valley KGRA, in Mono County, California. The Basalt Canyon geothermal exploration area consists of those lands located within Section 31, T3S, R28E, and Section 36, T3S, R27E, MDB&M, which are west of U.S. Highway 395 and north of California Highway 203. These lands are located entirely within the Inyo National Forest. The Basalt Canyon Slim Hole Exploration Project is a plan to drill and monitor up to five small diameter holes from up to five of six specific sites in the Basalt Canyon geothermal exploration area (see Figure 1). The Basalt Canyon Geothermal Well Exploration Project is a plan to drill, complete, and test up to two large diameter geothermal exploration wells from up to two of these same six identified sites. MPLP would make the determination as to specifically which slim hole or geothermal well to drill based on the geological, geophysical, geothermal resource and other data available at the time each decision must be made.

Data Completion Notes

Pages 10-20 should be deleted from the FONSI PDF. They are a separate FONSI from 2005.