Thermal Gradient Holes At Long Valley Caldera Geothermal Area (Conservation, 2009)
Exploration Activity: Thermal Gradient Holes At Long Valley Caldera Geothermal Area (Conservation, 2009)
|Exploration Activity Details|
|Location||Long Valley Caldera Geothermal Area|
|Exploration Technique||Thermal Gradient Holes|
|Activity Date||1991 - 1991|
The Oh Well-1 temperature-gradient hole was drilled to 664 m depth in December 1991 near the town of Mammoth Lakes in the western caldera.
A maximum temperature of < 85°C was encountered in the hole. Although the measured temperature gradient was slightly higher than typical background gradients within the caldera, impermeable Early Rhyolite units penetrated by the borehole lacked thermal fluid input and were considered unproductive.
- State of California Department of Conservation (2009) Casa Diablo/Long Valley Caldera Area, Mono County
- EGS Inc. (2012) Technical Geologic Overview of Long Valley Caldera for the Casa Diablo IV Geothermal Development Project