Thermal Gradient Holes

GEOTHERMAL ENERGY

Exploration Technique: Thermal Gradient Holes

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• Details
• Activities (67)
• Areas (48)
• Regions (4)
• NEPA(33)

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Exploration Technique Information
Exploration Group:	Drilling Techniques
Exploration Sub Group:	Exploration Drilling
Parent Exploration Technique:	Exploration Drilling
Information Provided by Technique
Lithology:
Stratigraphic/Structural:
Hydrological:	Field wide fluid flow characteristics if an array of wells are drilled
Thermal:	Mapping and projecting thermal anomalies
Cost Information
Low-End Estimate (USD):	5.00 500 centUSD 0.005 kUSD 5.0e-6 MUSD 5.0e-9 TUSD / foot
Median Estimate (USD):	16.50 1,650 centUSD 0.0165 kUSD 1.65e-5 MUSD 1.65e-8 TUSD / foot
High-End Estimate (USD):	50.00 5,000 centUSD 0.05 kUSD 5.0e-5 MUSD 5.0e-8 TUSD / foot

Thermal Gradient Holes:

"A hole logged by a temperature probe to determine the thermal gradient. Usually involves a hole less than 500 ft deep drilled specifically for this purpose"

Other definitions:Wikipedia Reegle

 

Introduction

"Thermal gradient holes are typically shallow holes that are drilled and surveyed with a temperature probe. Designing a drilling program that will maximize the information based on orientation of the reservoir and faults can reveal an abundance of information about the hydrogeology and thermal properties of the deeper hydrothermal system (Smith, 1983; Coolbaugh, et al., 2007). Innovations in measuring temperature profiles in wells and projecting thermal anomalies beyond the temperature measurements have led to moderately accurate depictions of the hydrologic system." cannot be used as a page name in this wiki.

Thermal gradient holes are typically shallow holes that are drilled and surveyed with a temperature probe. Designing a drilling program that will maximize the information based on orientation of the reservoir and faults can reveal an abundance of information about the hydrogeology and thermal properties of the deeper hydrothermal system (Smith, 1983; Coolbaugh, et al., 2007). Innovations in measuring temperature profiles in wells and projecting thermal anomalies beyond the temperature measurements have led to moderately accurate depictions of the hydrologic system.

 

Use in Geothermal Exploration

"Temperature gradient holes are very useful in revealing hydrothermal properties of a geothermal system, ultimately decreasing the risk associated with drilling deeper and wider wells for further exploration or production. Thermal gradient holes are used for locating broad hydrothermal characteristics of a resource. They do not have the accuracy of predicting reservoir temperatures or depths. Although, if an array of thermal gradient holes are drilled across a field then more details will be revealed about the resource and its hydrologic system. Thermal gradient holes can provide important information about a resource increasing the confidence and likelihood of targeting a high temperature resource." cannot be used as a page name in this wiki.

Temperature gradient holes are very useful in revealing hydrothermal properties of a geothermal system, ultimately decreasing the risk associated with drilling deeper and wider wells for further exploration or production. Thermal gradient holes are used for locating broad hydrothermal characteristics of a resource. They do not have the accuracy of predicting reservoir temperatures or depths. Although, if an array of thermal gradient holes are drilled across a field then more details will be revealed about the resource and its hydrologic system. Thermal gradient holes can provide important information about a resource increasing the confidence and likelihood of targeting a high temperature resource.

 

Related Techniques

"2-M Probe Survey]] is a similar technique, but much shallower, cheaper and quicker to deploy." cannot be used as a page name in this wiki.

2-M Probe Survey is a similar technique, but much shallower, cheaper and quicker to deploy.

 

References

Smith, 1983, http://geophysics.geoscienceworld.org/content/48/5/618.short

Page	Area	Activity Start Date	Activity End Date	Reference Material
Thermal Gradient Holes At Alum Area (DOE GTP)	Alum Geothermal Area			GTP ARRA Spreadsheet
Thermal Gradient Holes At Blue Mountain Geothermal Area (Fairbank & Niggemann, 2004)	Blue Mountain Geothermal Area	1996	1999	Deep Blue No.1-A Slimhole Geothermal Discovery At Blue Mountain, Humboldt County, Nevada
Thermal Gradient Holes At Blue Mountain Geothermal Area (Fairbank & Ross, 1999)	Blue Mountain Geothermal Area	1999	1999	Geology and Temperature Gradient Surveys Blue Mountain Geothermal Discovery, Humboldt County, Nevada
Thermal Gradient Holes At Breitenbush Hot Springs Area (Ingebritsen, Et Al., 1993)	Breitenbush Hot Springs Area			Heat Flow From Four New Research Drill Holes In The Western Cascades, Oregon, Usa
Thermal Gradient Holes At Central Nevada Seismic Zone Region (Pritchett, 2004)	Central Nevada Seismic Zone Geothermal Region			Finding Hidden Geothermal Resources In The Basin And Range Using Electrical Survey Techniques- A Computational Feasibility Study
Thermal Gradient Holes At Chena Area (Erkan, Et. Al., 2008)	Chena Area			Understanding The Chena Hot Springs, Alaska, Geothermal System Using Temperature And Pressure Data From Exploration Boreholes
Thermal Gradient Holes At Chena Geothermal Area (EERE, 2010)	Chena Geothermal Area	2009	2010	4.2.1 GRED Drilling Award- GRED III Phase II
Thermal Gradient Holes At Chena Geothermal Area (Erkan, Et Al., 2007)	Chena Geothermal Area	2005	2007	Thermal Characteristics of the Chena Hot Springs Alaska Geothermal System
Thermal Gradient Holes At Chena Geothermal Area (Holdmann, Et Al., 2006)	Chena Geothermal Area	1998	2005	Integrated Geoscience Investigation and Geothermal Exploration at Chena Hot Springs, Alaska Geologic Setting of the Central Alaskan Hot Springs Belt: Implications for Geothermal Resource Capacity and Sustainable Energy Production
Thermal Gradient Holes At Chocolate Mountains Area (Alm, Et Al., 2010)	Chocolate Mountains Area			Geothermal Energy Resource Investigations, Chocolate Mountains Aerial Gunnery Range, Imperial Valley, California
Thermal Gradient Holes At Chocolate Mountains Area (Sabin, Et Al., 2010)	Chocolate Mountains Area			Navy’s Geothermal Program Office: Overview of Recovery Act (ARRA) Funded Exploration in CA and NV and other Exploration Projects
Thermal Gradient Holes At Coso Geothermal Area (1974)	Coso Geothermal Area	1974	1974	Heat flow and microearthquake studies, Coso Geothermal Area, China Lake, California. Final report Heat flow studies, Coso Geothermal Area, China Lake, California. Technical report
Thermal Gradient Holes At Coso Geothermal Area (1976)	Coso Geothermal Area	1976	1976	Heat flow determinations and implied thermal regime of the Coso geothermal area, California
Thermal Gradient Holes At Cove Fort Area (Warpinski, Et Al., 2002)	Cove Fort Geothermal Area			Geothermal Resource Exploration And Definition Project
Thermal Gradient Holes At Cove Fort Area (Warpinski, Et Al., 2004)	Cove Fort Geothermal Area			Geothermal Resource Exploration And Definition Projects
Thermal Gradient Holes At Cove Fort Area - Vapor (Warpinski, Et Al., 2002)	Cove Fort Geothermal Area			Geothermal Resource Exploration And Definition Project
Thermal Gradient Holes At Cove Fort Area - Vapor (Warpinski, Et Al., 2004)	Cove Fort Geothermal Area			Geothermal Resource Exploration And Definition Projects
Thermal Gradient Holes At Crump's Hot Springs Area (DOE GTP)	Crump's Hot Springs Geothermal Area			GTP ARRA Spreadsheet
Thermal Gradient Holes At Fenton Hill HDR Geothermal Area (Purtymun, Et Al., 1974)	Fenton Hill HDR Geothermal Area		1972	Geology of Geothermal Test Hole GT-2 Fenton Hill Site, July 1974 Subsurface Temperature Data in Jemez Mountains, New Mexico Geology Of The Fenton Hill, New Mexico, Hot Dry Rock Site
Thermal Gradient Holes At Fish Lake Valley Area (DOE GTP)	Fish Lake Valley Area			GTP ARRA Spreadsheet
Thermal Gradient Holes At Flint Geothermal Area (DOE GTP)	Flint Geothermal Area			GTP ARRA Spreadsheet
Thermal Gradient Holes At Fort Bidwell Area (Lafleur, Et Al., 2010)	Fort Bidwell Area			Update On Geothermal Exploration At Fort Bidwell, Surprise Valley California
Thermal Gradient Holes At Fort Bliss Area (DOE GTP)	Fort Bliss Area			GTP ARRA Spreadsheet
Thermal Gradient Holes At Glass Mountain Area (Cumming And Mackie, 2007)	Glass Mountain Geothermal Area			3D Mt Resistivity Imaging For Geothermal Resource Assessment And Environmental Mitigation At The Glass Mountain Kgra, California
Thermal Gradient Holes At Hawthorne Area (Lazaro, Et Al., 2010)	Hawthorne Area			United States Department Of The Navy Geothermal Exploration Leading To Shallow And Intermediate-Deep Drilling At Hawthorne Ammunition Depot, Hawthorne, Nv
Thermal Gradient Holes At Hawthorne Area (Sabin, Et Al., 2010)	Hawthorne Area			Navy’s Geothermal Program Office: Overview of Recovery Act (ARRA) Funded Exploration in CA and NV and other Exploration Projects
Thermal Gradient Holes At Hot Pot Area (DOE GTP)	Hot Pot Area			GTP ARRA Spreadsheet
Thermal Gradient Holes At Hot Springs Ranch Area (Szybinski, 2006)	Hot Springs Ranch Area			Pumpernickel Valley Geothermal Project Thermal Gradient Wells
Thermal Gradient Holes At Hualalai Northwest Rift Area (Thomas, 1986)	Hualalai Northwest Rift Area			Geothermal Resources Assessment In Hawaii
Thermal Gradient Holes At Kilauea East Rift Area (Quane, Et Al., 2000)	Kilauea East Rift Area			Magmatic History Of The East Rift Zone Of Kilauea Volcano, Hawaii Based On Drill Core From SOH 1
Thermal Gradient Holes At Kilauea East Rift Geothermal Area (Thomas, 1986)	Kilauea East Rift Geothermal Area	1978	1987	Geothermal Resources Assessment In Hawaii
Thermal Gradient Holes At Kilauea Summit Area (Keller, Et Al., 1979)	Kilauea Summit Area			Results Of An Experimental Drill Hole At The Summit Of Kilauea Volcano, Hawaii
Thermal Gradient Holes At Lake City Hot Springs Area (Warpinski, Et Al., 2004)	Lake City Hot Springs Area			Geothermal Resource Exploration And Definition Projects
Thermal Gradient Holes At Lightning Dock Area (Cunniff & Bowers, 2005)	Lightning Dock Area			Final technical report geothermal resource evaluation and definition (GRED) Program - Phase I, II and III for the Animas Valley, NM Geothermal Resource: special proprietary report to Lightning Dock Geothermal, Inc.
Thermal Gradient Holes At Lightning Dock Area (Warpinski, Et Al., 2004)	Lightning Dock Area			Geothermal Resource Exploration And Definition Projects
Thermal Gradient Holes At Lightning Dock Geothermal Area (Arnold, Et Al., 1978)	Lightning Dock Geothermal Area	1977	1977	New Mexico's Energy Resources '77: Office of the State Geologist
Thermal Gradient Holes At Lightning Dock Geothermal Area (Cunniff & Bowers, 2005)	Lightning Dock Geothermal Area	2003	2005	Final technical report geothermal resource evaluation and definition (GRED) Program - Phase I, II and III for the Animas Valley, NM Geothermal Resource: special proprietary report to Lightning Dock Geothermal, Inc.
Thermal Gradient Holes At Lightning Dock Geothermal Area (Cunniff, Et Al., 2003)	Lightning Dock Geothermal Area	2003	2003	Final Report: Enhanced Geothermal Systems Technology Phase II: Animas Valley, New Mexico
Thermal Gradient Holes At Long Valley Caldera Geothermal Area (Conservation, 2009)	Long Valley Caldera Geothermal Area	1991	1991	Casa Diablo/Long Valley Caldera Area, Mono County Technical Geologic Overview of Long Valley Caldera for the Casa Diablo IV Geothermal Development Project
Thermal Gradient Holes At Long Valley Caldera Geothermal Area (Farrar, Et Al., 2003)	Long Valley Caldera Geothermal Area	1998	2002	Inferences On The Hydrothermal System Beneath The Resurgent Dome In Long Valley Caldera, East-Central California, USA, From Recent Pumping Tests And Geochemical Sampling
Thermal Gradient Holes At Long Valley Caldera Geothermal Area (Lachenbruch, Et Al., 1976)	Long Valley Caldera Geothermal Area	1962	1973	The Near-Surface Hydrothermal Regime of Long Valley Caldera The Hydrothermal System of Long Valley Caldera, California
Thermal Gradient Holes At Long Valley Caldera Geothermal Area (Sorey, Et Al., 1978)	Long Valley Caldera Geothermal Area	1978	1985	The Hydrothermal System of Long Valley Caldera, California
Thermal Gradient Holes At Long Valley Caldera Geothermal Area (Sorey, Et Al., 1991)	Long Valley Caldera Geothermal Area	1985	1988	New Evidence On The Hydrothermal System In Long Valley Caldera, California, From Wells, Fluid Sampling, Electrical Geophysics, And Age Determinations Of Hot-Spring Deposits
Thermal Gradient Holes At Mccoy Geothermal Area (DOE GTP)	Mccoy Geothermal Area			GTP ARRA Spreadsheet
Thermal Gradient Holes At Mcgee Mountain Area (DOE GTP)	Mcgee Mountain Area			GTP ARRA Spreadsheet
Thermal Gradient Holes At Mt Princeton Hot Springs Geothermal Area (Held & Henderson, 2012)	Mt Princeton Hot Springs Geothermal Area	1973	1975	New developments in Colorado geothermal energy projects
Thermal Gradient Holes At Neal Hot Springs Geothermal Area (U.S. Geothermal Inc., 2010)	Neal Hot Springs Geothermal Area	2009	2010	Idaho Public Utilities Commission Approves Neal Hot Springs Power Purchase Agreement U.S. Geothermal Starts New Drilling Programs at Neal Hot Springs Project U.S. Geothermal Completes Second Successful Production Well at Neal Hot Springs Project
Thermal Gradient Holes At Newberry Caldera Area (DOE GTP)	Newberry Caldera Area			GTP ARRA Spreadsheet
Thermal Gradient Holes At North Brawley Geothermal Area (Edmunds & W., 1977)	North Brawley Geothermal Area	1977	1977	Geothermal Development in Imperial County
Thermal Gradient Holes At North Brawley Geothermal Area (Matlick & Jayne, 2008)	North Brawley Geothermal Area	1970	1975	Brawley Resurrection of a Previously Developed Geothermal Field
Thermal Gradient Holes At Northern Basin & Range Region (Pritchett, 2004)	Northern Basin and Range Geothermal Region			Finding Hidden Geothermal Resources In The Basin And Range Using Electrical Survey Techniques- A Computational Feasibility Study
Thermal Gradient Holes At Nw Basin & Range Region (Pritchett, 2004)	Northwest Basin and Range Geothermal Region			Finding Hidden Geothermal Resources In The Basin And Range Using Electrical Survey Techniques- A Computational Feasibility Study
Thermal Gradient Holes At Obsidian Cliff Area (Hulen, Et Al., 2003)	Obsidian Cliff Area			Geology And A Working Conceptual Model Of The Obsidian Butte (Unit 6) Sector Of The Salton Sea Geothermal Field, California
Thermal Gradient Holes At Pilgrim Hot Springs Area (DOE GTP)	Pilgrim Hot Springs Area			GTP ARRA Spreadsheet
Thermal Gradient Holes At Roosevelt Hot Springs Geothermal Area (Ward, Et Al., 1978)	Roosevelt Hot Springs Geothermal Area	1978	1978	A Summary of the Geology, Geochemistry, and Geophysics of the Roosevelt Hot Springs Thermal Area, Utah
Thermal Gradient Holes At Salt Wells Area (Bureau of Land Management, 2009)	Salt Wells Geothermal Area	2008	2008	Salt Wells Geothermal Exploratory Drilling Program EA (DOI-BLM-NV-C010-2009-0006-EA)
Thermal Gradient Holes At San Emidio Desert Area (DOE GTP)	San Emidio Desert Area			GTP ARRA Spreadsheet
Thermal Gradient Holes At Silver Peak Area (DOE GTP)	Silver Peak Area			GTP ARRA Spreadsheet
Thermal Gradient Holes At Socorro Mountain Area (Owens, Et Al., 2005)	Socorro Mountain Area			New Methods In Exploration At The Socorro Peak Kgra- A Gred Iii Project
Thermal Gradient Holes At Spencer Hot Springs Area (Shevenell, Et Al., 2008)	Spencer Hot Springs Geothermal Area			Our Evolving Knowledge Of Nevada'S Geothermal Resource Potential
Thermal Gradient Holes At Tungsten Mountain Area (Kratt, Et Al., 2008)	Tungsten Mountain Area			A New Gold Pan For The West- Discovering Blind Geothermal Systems With Shallow Temperature Surveys
Thermal Gradient Holes At Tungsten Mountain Area (Shevenell, Et Al., 2008)	Tungsten Mountain Area			Our Evolving Knowledge Of Nevada'S Geothermal Resource Potential
Thermal Gradient Holes At Twenty-Nine Palms Area (Page, Et Al., 2010)	Twenty-Nine Palms Geothermal Area			Field Investigations And Temperature-Gradient Drilling At Marine Corps Air-Ground Combat Center (Mcagcc), Twenty-Nine Palms, Ca
Thermal Gradient Holes At Twenty-Nine Palms Area (Sabin, Et Al., 2010)	Twenty-Nine Palms Geothermal Area			Navy’s Geothermal Program Office: Overview of Recovery Act (ARRA) Funded Exploration in CA and NV and other Exploration Projects
Thermal Gradient Holes At Upper Hot Creek Ranch Area (Benoit & Blackwell, 2006)	Upper Hot Creek Ranch Area			Exploration Of The Upper Hot Creek Ranch Geothermal Resource, Nye County, Nevada
Thermal Gradient Holes At Walker-Lane Transitional Zone Region (Pritchett, 2004)	Walker-Lane Transition Zone Geothermal Region			Finding Hidden Geothermal Resources In The Basin And Range Using Electrical Survey Techniques- A Computational Feasibility Study
Thermal Gradient Holes At Waunita Hot Springs Geothermal Area (Zacharakis, 1981)	Waunita Hot Springs Geothermal Area	1981	1981	Temperature, heat flow maps and temperature gradient holes

1. Alum Geothermal Area
2. Blue Mountain Geothermal Area
3. Breitenbush Hot Springs Area
4. Central Nevada Seismic Zone Geothermal Region
5. Chena Area
6. Chena Geothermal Area
7. Chocolate Mountains Area
8. Coso Geothermal Area
9. Cove Fort Geothermal Area
10. Crump's Hot Springs Geothermal Area
11. Fenton Hill HDR Geothermal Area
12. Fish Lake Valley Area
13. Flint Geothermal Area
14. Fort Bidwell Area
15. Fort Bliss Area
16. Glass Mountain Geothermal Area
17. Hawthorne Area
18. Hot Pot Area
19. Hot Springs Ranch Area
20. Hualalai Northwest Rift Area
21. Kilauea East Rift Area
22. Kilauea East Rift Geothermal Area
23. Kilauea Summit Area
24. Lake City Hot Springs Area
25. Lightning Dock Area
26. Lightning Dock Geothermal Area
27. Long Valley Caldera Geothermal Area
28. Mccoy Geothermal Area
29. Mcgee Mountain Area
30. Mt Princeton Hot Springs Geothermal Area
31. Neal Hot Springs Geothermal Area
32. Newberry Caldera Area
33. North Brawley Geothermal Area
34. Northern Basin and Range Geothermal Region
35. Northwest Basin and Range Geothermal Region
36. Obsidian Cliff Area
37. Pilgrim Hot Springs Area
38. Roosevelt Hot Springs Geothermal Area
39. Salt Wells Geothermal Area
40. San Emidio Desert Area
41. Silver Peak Area
42. Socorro Mountain Area
43. Spencer Hot Springs Geothermal Area
44. Tungsten Mountain Area
45. Twenty-Nine Palms Geothermal Area
46. Upper Hot Creek Ranch Area
47. Walker-Lane Transition Zone Geothermal Region
48. Waunita Hot Springs Geothermal Area

1. Central Nevada Seismic Zone Geothermal Region
2. Northern Basin and Range Geothermal Region
3. Northwest Basin and Range Geothermal Region
4. Walker-Lane Transition Zone Geothermal Region

Document #	Analysis Type	Applicant	Geothermal Area	Lead Agency	District Office	Field Office	Mineral Manager	Surface Manager	Development Phase(s)	Techniques
DNA-NV-030-09-03	DNA	Dusty Miller LLC	Gabbs Valley Geothermal Area	Bureau of Land Management	BLM Carson City District Office	BLM Stillwater Field Office	Bureau of Land Management	Bureau of Land Management	Geothermal/Exploration	Thermal Gradient Holes
DOI-BLM-CA-EA-2002-???	EA	Calpine Corporation (Calpine) and CPN Telephone Flat Inc. (CPN)	Glass Mountain Geothermal Area	Bureau of Land Management			Bureau of Land Management	Bureau of Land Management	Geothermal/Well Field	Exploration Drilling Thermal Gradient Holes
DOI-BLM-ID-B010-2010-0083-CX	CX	Agua Caliente		BLM Idaho State Office	BLM Boise District Office	BLM Four Rivers Field Office	Bureau of Land Management	Bureau of Land Management	Geothermal/Exploration	Thermal Gradient Holes
DOI-BLM-NV-B020-2008-????-??		Sierra Geothermal Power	Reese River Geothermal Area	Bureau of Land Management	BLM Battle Mountain District Office				Geothermal/Exploration	Seismic Techniques Thermal Gradient Holes
DOI-BLM-NV-B020-2010-????-CX	CX	Ormat Technologies Inc		BLM Nevada State Office	BLM Battle Mountain District Office		Bureau of Land Management	Bureau of Land Management	Geothermal/Exploration	Thermal Gradient Holes
DOI-BLM-NV-C010-2009-0006-EA	EA	Gradient Resources	Salt Wells Geothermal Area	BLM Stillwater Field Office	BLM Carson City District Office	BLM Stillwater Field Office	BLM Stillwater Field Office	BLM Stillwater Field Office	Geothermal/Exploration	Thermal Gradient Holes
DOI-BLM-NV-C010-2009-0030-CX	CX	Vulcan Power Company	Carson Lake Corral Geothermal Area	Bureau of Land Management	BLM Carson City District Office	BLM Stillwater Field Office	Bureau of Land Management	Bureau of Land Management	Geothermal/Exploration	Thermal Gradient Holes
DOI-BLM-NV-C010-2010-0006-DNA	DNA	Ormat Technologies Inc	Gabbs Valley Geothermal Area	BLM Nevada State Office	BLM Carson City District Office	BLM Stillwater Field Office	Bureau of Land Management	Bureau of Land Management	Geothermal/Exploration	Drilling Techniques Thermal Gradient Holes
DOI-BLM-NV-C010-2010-0052-CX	CX	Magma Energy	Soda Lake Geothermal Area	BLM Nevada State Office	BLM Carson City District Office	BLM Stillwater Field Office			Geothermal/Exploration	Drilling Techniques Thermal Gradient Holes
DOI-BLM-NV-C010-2011-0516-EA	EA	Ormat Technologies Inc	Dixie Meadows Geothermal Area	Bureau of Land Management	BLM Carson City District Office	BLM Stillwater Field Office	Bureau of Land Management	Bureau of Land Management	Geothermal/Exploration Geothermal/Well Field	Drilling Techniques Thermal Gradient Holes
DOI-BLM-NV-C010-2012-0057-CX	CX	Ormat Technologies Inc	Dixie Meadows Geothermal Area	Bureau of Land Management	BLM Carson City District Office	BLM Stillwater Field Office	Bureau of Land Management	Bureau of Land Management	Geothermal/Exploration	Thermal Gradient Holes
DOI-BLM-NV-C010-2012-0069-CX	CX	Ormat Technologies Inc	Aqua Quieta Geothermal Area	Bureau of Land Management	BLM Carson City District Office	BLM Stillwater Field Office	Bureau of Land Management	Bureau of Land Management	Geothermal/Exploration	Thermal Gradient Holes
DOI-BLM-NV-C010-2013-0022-DNA	DNA	Ormat Technologies Inc	Dixie Meadows Geothermal Area	Bureau of Land Management	BLM Carson City District Office	BLM Stillwater Field Office	Bureau of Land Management	Bureau of Land Management	Geothermal/Exploration	Thermal Gradient Holes
DOI-BLM-NV-C010-????-????-CX	CX	Ormat Technologies Inc	Dixie Valley Geothermal Area	Bureau of Land Management	BLM Carson City District Office				Geothermal/Exploration	Thermal Gradient Holes
DOI-BLM-NV-CO10-2011-0501-EA	EA	Gradient Resources	Patua Geothermal Area	Bureau of Land Management	BLM Carson City District Office	BLM Stillwater Field Office		Bureau of Land Management	Geothermal/Well Field	Production Wells Thermal Gradient Holes
DOI-BLM-NV-E030-2011-0017-CX	CX	USGS		BLM Nevada State Office	BLM Elko District Office			Bureau of Land Management	Geothermal/Exploration	Thermal Gradient Holes
DOI-BLM-NV-W010-2010-0043-CX-2	CX	Geothermal Technical Partners	McGee Mountain Geothermal Area	Bureau of Land Management	BLM Winnemucca District Office	BLM Humboldt River Field Office	Bureau of Land Management	Bureau of Land Management	Geothermal/Exploration	Well Testing Techniques Slim Holes Thermal Gradient Holes Geophysical Techniques
DOI-BLM-NV-W030-2012-0020-CX	CX	Nevada Bureau of Mines and Geology	Pinto Hot Springs Geothermal Area	Bureau of Land Management	BLM Winnemucca District Office				Geothermal/Exploration	Thermal Gradient Holes
DOI-BLM-NV-WO10-2014-0002-CX	CX	Ormat Technologies Inc	Baltazor Hot Springs Geothermal Area	BLM Humboldt River Field Office	BLM Winnemucca District Office	BLM Humboldt River Field Office	BLM Nevada State Office	BLM Nevada State Office	Geothermal/Exploration	Thermal Gradient Holes
DOI-BLM-OR-P000-2012-0043-CX	CX	Ormat Technologies Inc	Twilight Geothermal Area	BLM Oregon State Office	BLM Prineville District Office			United States Forest Service	Geothermal/Exploration	Thermal Gradient Holes
DOI-BLM-UT-W019-2011-0006-CX	CX	Utah Geological Survey		BLM Utah State Office	BLM West Desert District Office				Geothermal/Exploration	Thermal Gradient Holes
DOI-BLM-UT-W019-2011-0007-CX	CX	Utah Geological Survey		BLM Utah State Office			Bureau of Land Management		Geothermal/Exploration	Thermal Gradient Holes
DOI-BLM-UT-W020-2009-0028-EA	EA	Standard Steam Trust LLC	Drum Mountain Geothermal Area	Bureau of Land Management	BLM West Desert District Office		Bureau of Land Management	Bureau of Land Management	Geothermal/Exploration	Thermal Gradient Holes
DOI-BLM-UT-W020-2010-0042-EA	EA	Ormat Technologies Inc		Bureau of Land Management	BLM West Desert District Office		Bureau of Land Management	Bureau of Land Management	Geothermal/Exploration Geothermal/Well Field	Thermal Gradient Holes
DOI-LM-NV-W010-2012-0061-CX	CX	Nevada Bureau of Mines and Geology	Desert Queen Geothermal Area	Bureau of Land Management	BLM Winnemucca District Office	BLM Humboldt River Field Office	Bureau of Land Management	Bureau of Land Management	Geothermal/Exploration	Thermal Gradient Holes
EA for Well Field Development at Patua Geothermal Area - DOI-BLM-NV-C010-2011-00016-EA	EA	Gradient Resources	Patua Geothermal Area	Bureau of Land Management	BLM Carson City District Office	BLM Stillwater Field Office	Bureau of Land Management	Bureau of Land Management Bureau of Reclamation	Geothermal/Exploration Geothermal/Well Field	Drilling Techniques Exploratory Well Thermal Gradient Holes
EA-NV-030-07-006	EA	Ormat Technologies Inc	Carson Lake Corral Geothermal Area	Bureau of Land Management	BLM Carson City District Office	BLM Stillwater Field Office	Bureau of Land Management	Bureau of Land Management Bureau of Reclamation	Geothermal/Well Field	Exploration Drilling Slim Holes Thermal Gradient Holes
NEPA Process for Geothermal Power Plants in the Deschutes National Forest	EIS	Cal Energy	Newberry Caldera Geothermal Area	U.S. Forest Service Bureau of Land Management					Geothermal/Exploration Geothermal/Well Field Geothermal/Power Plant	Exploration Drilling Exploratory Boreholes Production Wells Thermal Gradient Holes
NV-020-08-DNA-52	DNA	Gerlach Geothermal LLC		Bureau of Land Management	BLM Winnemucca District Office				Geothermal/Exploration	Thermal Gradient Holes
NV-063-EA06-098	EA	Sierra Geothermal Power	Reese River Geothermal Area	Bureau of Land Management	BLM Battle Mountain District Office		Bureau of Land Management	Bureau of Land Management	Geothermal/Exploration	Slim Holes Thermal Gradient Holes
NV-EA-030-07-05	EA	Vulcan Power Company	Salt Wells Geothermal Area	Bureau of Land Management	BLM Carson City District Office	BLM Stillwater Field Office	Bureau of Land Management	Bureau of Land Management	Geothermal/Exploration	Thermal Gradient Holes
NVN-088205	EA	Ormat Technologies Inc	Gabbs Valley Geothermal Area	BLM Stillwater Field Office	BLM Carson City District Office	BLM Stillwater Field Office	BLM Stillwater Field Office	BLM Stillwater Field Office	Geothermal/Exploration	Exploratory Well Observation Wells Thermal Gradient Holes
NVN-89534	CU	Nevada Geothermal Power	Blue Mountain Geothermal Area	BLM Nevada State Office	BLM Winnemucca District Office	BLM Humboldt River Field Office	Bureau of Land Management	Bureau of Land Management	Geothermal/Exploration	Thermal Gradient Holes

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