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Stanley Geothermal Feasibility Study

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Stanley Geothermal Feasibility Study ( stanley-geothermal-feasibility-study )

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1. Introduction The purpose of this task is to summarize the data accumulated from previous sections of this study. From this, a discussion of the potential locations for an exploratory well(s) will be discussed. The well(s) will establish depth, temperature, and flow rates for the geothermal system near Stanley. So far four sub-studies have been discussed. They include a general geologic background to the Stanley area, creation of relevant geologic maps, hydrochemistry and geothermometry, and geologic and geophysical surveys. A brief discussion of each of these reports will be followed by placing them into a broader context of what they mean for the Stanley project. After this has been done, a location(s) for the test well(s) will be proposed. 2. General Geologic Background Stanley resides in central Idaho along the confluence of Valley Creek and the Salmon River near State Highways 21 and 75. Three distinct rock types exist in the Stanley area: granitic and granodioritic rocks of the Idaho Batholith, volcanic rocks of the Challis Volcanic Group, and Quaternary glacial and fluvial sediments. The most important rocks to the Stanley geothermal system with respect to heat generation are most likely the volcanic rocks of the Challis Volcanic Group, as they have high reported concentrations of the radioactive elements U, Th, and K (Swanberg and Blackwell, 1973; van Middlesworth and Wood, 1998). Understanding the role of faults and fractures in the movement of hydrothermal waters is paramount to properly characterize any geothermal system. In Stanley, two directions of fault orientations dominate: those trending NE-SW related to the Trans-Challis Fault System and those trending NW-SE related to regional extension of the Basin and Range geologic province. The creation of these faults allows for deep circulation of meteoric water, which over time will produce thermal water because of interaction with rocks with high heat generation and also from normal geothermal gradients. Fractures are important locally to the Stanley geothermal system because fractures also allow for rapid transport of fluids over great distances. Many warm seeps and hot springs within the Stanley area, specifically along the Salmon River, lie along the Mormon Bend Fault (Krahmer, 1995). Glacial sediments are also important to the Stanley geothermal system because in the area southwest of the Historical Museum there are numerous warm seeps that discharge from these sediments. The glacial and alluvial sediments also contain significant colder ground water which can interact and dilute the upwelling thermal water. The locations of these seeps are no doubt controlled by geologic structures that affect the basement rocks (granites of the Idaho Batholith) and the overlying stratigraphy of the glacial and fluvial sediments. 2

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