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Geothermal study of the southwest part of the Black Rock Desert and its geothermal areas ; Washoe, Pershing, and Humboldt Counties, Nevada
Anderson, J.P.
1978 Jul 01
Several hydrothermal systems were explored in northwestern Nevada in parts of Washoe, Pershing, and Humboldt Counties.
These hydrothermal systems included
 the Great Boiling springs and Mud springs at Gerlach, 
 the Fly Ranch hot springs in Hualapai Flat,
 Double Hot and Black Rock springs at the southern end of the Black Rock Range,
 Trego hot spring,
 Soldier Meadows hot springs,
 and hot springs at Pinto Mt.,
 at Pyramid Lake Needles region,
 and in the San Emidio and Smoke Creek Deserts.
Thermal and nonthermal groundwater was analyzed to determine the water quality of the various hot spring regions.
Water discharged from the hot springs of Trego, Gerlach, San Emidio and Smoke Creek Deserts, and Pyramid Lake Needles area is classified as Na--Cl.
This water is characterized by high values of Na/sup +/, Cl/sup -/, HCO/sub 3//sup -/, and SiO/sub 2/ and is neutral in pH.
Water discharged from the hot springs of Soldier Meadows, Pinto Mt., Double Hot springs, and Fly Ranch hot springs is classified as Na--HCO/sub 3/.
This water is similar to the nonthermal water of these areas, and probably represents circulation of meteoric water near a heat source, 
with very little addition of magma-derived fluids.
The similarities of the trilinear plots of the chemical quality of nonthermal and thermal waters suggest the origin 
of the thermal waters is deep circulation of meteoric water with the addition of some connate water.
Based on the use of the silica, Na/K, and Na--K--Ca geothermometers, 
the Great Boiling springs at Gerlach appears to be the most promising geothermal prospect in the study area.
The sub-surface temperature calculated for this area was 175 to 200/sup 0/C.
The springs along the eastern edge of the San Emidio Desert have the greatest potential for yielding commercial 
geothermal fluids based on a geochemical temperature of 216/sup 0/C.
Hualapai Flat (Fly Ranch) contains a large number of hot springs, but temperatures of the reservoir based 
on geochemistry ranged from 125 to 155/sup 0/C.