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Setting up for drilling operations at CPV-001.
The Crescent Valley properties were acquired in the merger with Earth Power Resources on December 12, 2014. The prospect consists of approximately 21,300 acres (33.3 square miles) of private and Federal geothermal leases. It is located in Eureka County, Nevada, approximately 15 miles south of the Beowawe geothermal power plant and about 33 miles southeast of Battle Mountain.
At Crescent Valley, multiple geothermal and mineral exploration drilling programs have identified high temperatures and high temperature gradients in the shallow subsurface over an area greater than 30 square miles. Historic drill holes defining this area have anomalous temperature gradients of up to 40°F/100 feet of depth, and a recorded high temperature of 285°F at 395 feet below the surface. These drill holes define large areas of hydrothermal alteration that correspond to positive anomalies defined by gravity surveys that extend into undrilled areas of the valley, where densification is presumed to be related to hydrothermal alteration.
A mineral exploration hole drilled in the mid-l990s near the Crescent Valley fault encountered geothermal fluid under pressure and the driller lost control the well. An oil field service company had to be contracted to regain control and abandon the well. This well demonstrates that prospective permeability and commercial temperature are known from past minerals exploration.
Hot springs located on the property have discharge temperatures up to 198°F and broad areas of hydrothermal alteration occur at both Hot Springs Point and along the Crescent Valley fault 8 miles to the southeast. Chemistry of the hot springs and the occurrence of silica sinter deposits at surface, and intersected by drilling in the shallow subsurface, suggest reservoir temperatures at depth of greater than 350°F. Chemistry of fluids from the Crescent Valley hot spring is permissive for even higher temperatures of greater than 400°F.
Anomalous temperature gradients extend up to 7 miles northwest from the Crescent Valley fault into Crescent Valley proper. Additional fracture controlled permeability may be present under the valley floor as horst-bounding fault systems interpreted from historic seismic studies are indicated to exist.
Geothermex, an independent geothermal consulting firm, evaluated all of the available data for the Crescent Valley Geothermal Prospect in late 2009. After evaluating those data, Geothermex used a recoverable-heat-in-place Monte Carlo method to estimate the generation potential of the prospect. They estimated the field could generate 71 MW with 90% probability and 186 MW with 50% probability over a 20 year period. U.S. Geothermal will drill and test wells at the prospect in order to confirm their results.
- Setting up for drilling operations at CPV-001.
- Surface casing installation at CPV-001.
- Crescent Valley as seen from the CPV-001 drill pad.