Low-to-moderate temperature geothermal resource assessment for Nevada, area specific studies. Final report, June 1, 1980-August 30, 1981
The Hawthorne study area is located in Mineral County, Nevada and surrounds the municipality of the same name. It encompasses an area of approximately 310 sq. km (120 sq. mi), and most of the land belongs to the US Army Ammunition Plant. The energy needs of the military combined with those of the area population (over 5,000 residents) are substantial. The area is classified as having a high potential for direct applications using the evaluation scheme described in Texler and others (1979). A variety of scientific techniques was employed during area-wide resource assessment. General geologic studies demonstrate the lithologic diversity in the area; these studies also indicate possible sources for dissolved fluid constituents. Geophysical investigations include aero-magnetic and gravity surveys which aid in defining the nature of regional, and to a lesser extent, local variations in subsurface configurations. Surface and near-surface structural features are determined using various types of photo imagery including low sun-angle photography. An extensive shallow depth temperature probe survey indicates two zones of elevated temperature on opposite sides of the Walker Lake basin. Temperature-depth profiles from several wells in the study area indicate significant thermal fluid-bearing aquifers. Fluid chemical studies suggest a wide spatial distribution for the resource, and also suggest a meteoric recharge source in the Wassuk Range. Finally, a soil-mercury survey was not a useful technique in this study area. Two test holes were drilled to conclude the area resource assessment, and thermal fluids were encountered in both wells. The western well has measured temperatures as high as 90 C (194 F) within 150 meters (500 ft) of the surface. Temperature profiles in this well indicate a negative temperature gradient below 180 meters (590 ft). The eastern hole had a bottom hole temperature of 61 C (142 F) at a depth of only 120 meters (395 ft). A positive gradient is observed to a total depth in the well. Several conclusions are drawn from this study: the resource is distributed over a relatively large area; resource fluid temperatures can exceed 90 C (194 F), but are probably limited to a maximum of 125 C (257 F); recharge to the thermal system is meteoric, and flow of the fluids in the near surface (< 500 m) is not controlled by faults; heat supplied to the system may be related to a zone of partially melted crustal rocks in the area 25 km (15 mi) south of Hawthorne. Four papers and an introduction are included. A separate abstract was prepared for each paper. (MHR)
- Research Organization:
- Nevada Bureau of Mines and Geology, Reno (US)
- Sponsoring Organization:
- Not Available (US)
- DOE Contract Number:
- AC08-79NV10039
- OSTI ID:
- 6325101
- Report Number(s):
- DOE/NV/10039-3; ON: DE81030487; TRN: US200508%%40
- Resource Relation:
- Other Information: PBD: 1 Jan 1981
- Country of Publication:
- United States
- Language:
- English
Similar Records
Geothermal Play-Fairway Analysis of Washington State Prospects: Final Report
The Newcastle geothermal system, Iron County, Utah
Related Subjects
45 MILITARY TECHNOLOGY, WEAPONRY, AND NATIONAL DEFENSE
AMMUNITION
AQUIFERS
EVALUATION
GEOTHERMAL RESOURCES
GRAVITY SURVEYS
PHOTOGRAPHY
PROBES
RESOURCE ASSESSMENT
SPATIAL DISTRIBUTION
TEMPERATURE GRADIENTS
NEVADA
GEOTHERMAL EXPLORATION
ABSTRACTS
DOCUMENT TYPES
EXPLORATION
NORTH AMERICA
RESOURCES
USA
GEOTHERMAL LEGACY
150101* - Geothermal Energy- Resources & Availability- USA- (-1989)
150300 - Geothermal Exploration & Exploration Technology