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US Department of Energy Tribal Energy Program

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Low concentrations of sodium (Na) and chlorine (Cl) at Division Hot Springs are similar to the Granite Mountain thermal water (Table 2) but are much different than Pilgrim hot springs and Serpentine which have much higher Na and Cl concentrations. Presumably the higher dissolved solids concentrations at Pilgrim and Serpentine Hot Springs involve much higher subsurface temperatures and perhaps longer subsurface residence times. The silica geothermometer suggests subsurface temperatures as high as 134 C using the solubility of quartz (Table 3). However, applying the pH correction to the silica geothermometer reduces this predicted temperature to 126°C and utilizing the pH corrected chalcedony geothermometer gives a predicted subsurface temperature of 99°C. Therefore, it is safe to say that the most likely predicted subsurface temperature based on silica is somewhere between 99°C and 126°C. The depth at which water of this temperature may be found is unknown given the absence of any nearby temperature gradient data. The Na/K/4/3Ca geothermometer gives a predicted subsurface temperature of 107°C, which is in reasonable overall agreement with the silica geothermometers (Table 3). 4.0 Discussion With the field work completed and analysis complete, the following topics will provide a discussion about comparisons between Interior Alaska hot springs, possible geothermal electricity production at Division hot springs, costs and alternative uses. 4.1.1 Comparison with Granite Mountain and Chena Hot Springs Using temperature, flow and area data from this area we can make a qualitative comparison with other known geothermal sites such as Granite Mountain (GM) and Chena Hot Springs. The length of the thermally active sites or fault at Division is larger than that of GM by a factor of two, and the temperatures exceed GM’s by ~40°F. This indicates that there are considerably larger resources in interior Alaska than GM. The Division Hot Springs area however, does not surpass Chena hot springs in overall length or in obvious surface discharge If the area within the swampy ground between the two hot springs truly is part of the thermal anomaly, then this comparison changes and Division Hot Springs may very well be comparable to Chena Hot Springs. With 3/4 mile long structure producing surface temperatures from 140-160°F there is a possibility of producing geothermal power. This is however speculative without knowing the subsurface temperatures between the springs. It should be noted that the drilling technique that would have been deployed at the springs would probably have not been sufficient to penetrate below the swampy area. 4.1.2 Power Generation and Costs Associated Assuming that the area between the two springs is part of one contiguous geothermal system, it is possible that the area could provide hundreds of kilowatts of geothermal

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