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US Department of Energy Tribal Energy Program

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CAHSB have a small surface “footprint,” and thus may not be visible on such images. Hence, it could be necessary to acquire other datasets to refine interpretations (see exploration option #3, below) 2. Soil geochemical surveys for Granite Mountain and Division hot springs regions. Purpose: locate geothermal anomalies using geochemical “tracers” in soils such as helium, mercury, carbon dioxide, and arsenic. In the absence of surface geothermal expressions (e.g., hot springs), soil sampling for geothermal “tracers” or indicator elements is a useful and low-cost exploration tool. In the Seward Peninsula area and other places in Alaska, helium (He) studies have been especially useful in geothermal studies (Wescott and Turner, 1981). These should be conducted in the granitic rocks north of Granite Mountain and at the contacts between granitic and volcanic rocks. 3. Ground-based geophysical surveys (magneto-tellurics, SP, etc.) for Granite Mountain and Division hot springs regions. Purpose: constrain subsurface structure (identify likely upwelling areas) and/or “see” geothermal reservoir fluids. All of the known hot springs described in this report issue from fractures within granitic intrusive rocks. It appears that the host granite must be well-fractured so that they have sufficient permeability to promote deep circulation of meteoric water (local snowmelt and rainwater). A variety of geophysical methods can target subsurface permeability by targeting identify zones of near-surface conductivity. Electromagnetic (EM), self-potential (SP), and audio magneto-telluric surveys are all examples of such methods. In addition to fluids, EM and AMT can also reveal concealed faults and other subsurface geologic structures. The results of these studies would have to be interpreted in the context of other data that exists for the region. Phase 3. Advanced Exploration Recommendations: 1. Thermal gradient / exploratory drilling (shallow holes) in Granite Mountain/Buckland and Division hot springs areas. Purpose: constrain thermal regime, confirm resource. Boreholes should avoid permafrost areas and/or be deep enough to get past permafrost. They should probably penetrate 2000 ft. or deeper and should follow guidelines outlined in a consultant’s report (Huttrer, 2002). Prior to drilling, available data for the region should be evaluated to determine the best locations for boreholes. 2. Detailed technical and economic feasibility studies of proposed projects. Purpose: determine feasbility of proposed project. Detailed economic analyses should follow exploration work to determine the feasibility of geothermal development at those sites. Unfortunately the economic analyses cannot be performed before this detailed work because the resource parameters are still unknown (distance from resource to load, production fluid temperature, etc.). 18

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