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The May 2010 reconnaissance study report by ACEP (attached as Appendix C) predicted a subsurface temperature between 99 ̊C (210 ̊F) and 126 ̊C (259 ̊F). If the upper and lower Division springs are part of one contiguous geothermal system, it is possible that Division Hot Springs could produce hundreds of kW of geothermal electric power using a low-temperature system similar to that used at Chena Hot Springs. It would require deep drilling to confirm the amount of heat energy available in the reservoir and to assess the feasibility of geothermal power generation. The estimated cost of mobilizing a drill rig by helicopter, and drilling a 3000’-4000’ deep core hole (not for production) would be between $1 million to $1.5 million. Because Division Hot Springs is located within the Selawik National Wildlife Refuge, obtaining permits for such a drilling operation could prove challenging. Due to the substantial cost of building a power line more than 40 miles long to the nearest community (either Shungnak, Kobuk or Huslia), and the high upfront exploration and development costs, the only recommended development scenario would be an on-site use combining low temperature geothermal power generation and direct-use heating, similar to uses proposed for Granite Mountain Hot Springs. At both Granite Mountain and Division Hot Springs, the cost of the 40 mile power line alone could be $20 million. Two other hot springs in the Purcell Mountains, Hawk and South, were not visited by the GAP research team because they are further away from NANA communities. The South and Hawk sites are about 37 and 49 air miles northwest of the Doyon community of Huslia, respectively, and about 50 air miles south of the Shungnak-Kobuk area. However, they could also provide direct-use heat for applications similar to those proposed for Division and Granite Mountain. The numbers for each spring below are from a 1978 map and table by J.S. Gassaway and B.S. Abramson (USGS Open-File Report 77-168). To the knowledge of the GAP research team, no more recent measurements have been taken at these two sites. South Hot Springs looks more favorable for development compared to Hawk Hot Springs, as it is closer to Huslia, and has a higher reported temperature and flow rate. Higher surface flow rates are the best early stage exploration indication of how much fluid a geothermal system might produce as it is known that the geothermal system can sustain at least the visible flow. Higher flow rates can in most instances be pumped from geothermal systems but without drilling and testing there is no way to predict how much fluid might be sustainable produced. Hawk Hot Springs- Water temperature: 43 ̊C (109 ̊F) Estimated spring outflow: 400 lpm (100 gpm) South Hot Springs- Water temperature: 67 ̊C (153 ̊F) Estimated spring outflow: 1350 lpm (360 gpm) 7 DE-FG36-07GO17075PDF Image | US Department of Energy Tribal Energy Program
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