Geology and Temperature Gradient Surveys Blue Mountain Geothermal Discovery, Humboldt County, Nevada

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Journal Article: Geology and Temperature Gradient Surveys Blue Mountain Geothermal Discovery, Humboldt County, Nevada

Abstract
Triassic argillite and sandstone of the Grass Valley Formation and phyllitic mudstone of the overlying Raspberry Formation, also of Triassic age, host a blind geothermal system under exploration by Blue Mountain Power Company Inc. with assistance from the Energy & Geoscience Institute. Geologically young, steeply dipping, open fault sets, striking N50-60°E,N50-60°W, and N-S intersect in the geothermal zone providing deep permeability over a wide area. Extensive silicification andhydro brecciation accompanied explosive boiling in a hydrothermal system as it evolved 3-5 million years ago. Advanced argillic alteration resulted from steam heating and acid leaching above the former boiling zone. Ten temperature gradient holes, measured to a maximum depth of 132 meters and spread over an area 1.5 x 3 km, have gradients exceeding 3OO°C/km;of these, six exceed 4OO°C/km. Temperatures extrapolated to 500-meter depths exceed 200°C for nine of these holes. Two other holes in deep gravel on the west side of survey area had anomalous gradients of 85 and 142°C/km respectively. The results are highly encouraging for the development of a high-temperature, relatively shallow geothermal reservoir.

Authors 
Brian D. Fairbank and Howard P. Ross








Published Journal 
Geothermal Resources Council Transactions, 1999





DOI 
Not Provided
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Online 
Internet link for Geology and Temperature Gradient Surveys Blue Mountain Geothermal Discovery, Humboldt County, Nevada

Citation

Brian D. Fairbank,Howard P. Ross. 1999. Geology and Temperature Gradient Surveys Blue Mountain Geothermal Discovery, Humboldt County, Nevada. Geothermal Resources Council Transactions. .


Related Geothermal Exploration Activities
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Areas (1)
  1. Blue Mountain Geothermal Area
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