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US Department of Energy Tribal Energy Program

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US Department of Energy Tribal Energy Program ( us-department-energy-tribal-energy-program )

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1.0 Background In 2008 NANA Pacific embarked on a study of potential renewable resources in the NANA region surrounding the town of Kotzebue, Alaska. As part of this effort, a report titled ‘NANA Geothermal Assessment Project (GAP) Results of Phase 1: Site Identification’ was completed by Amanda Kolker with assistance from Brian Yanity, and presented to the NANA Geothermal Working Group in January, 2009. The GAP report identified and briefly described and discussed geothermal systems and 7 thermal springs within the NANA region; Serpentine, Lava Creek, Granite Mountain, Hawk, South, Division, and Reed River Hot Springs. The relatively well known Pilgrim Hot Springs are located west of the NANA region and were not considered in the GAP Report. Reported surface temperatures of these thermal springs ranged from 109 oF at Hawk to 167 oF at Serpentine. Reported flow rates ranged from 40 gpm at Reed River Hot Springs to about 500 gpm at Division Hot Springs. None of these thermal springs are closely associated with active volcanoes so it was recognized that all of these geothermal resources have subsurface temperatures less than 300 oF and are not large in terms of volume or potential megawatt capacity. All of the seven known thermal springs within the NANA region are more than 40 miles from NANA region communities. Although it is possible that most or all of the known thermal springs in the NANA region might be theoretically capable of supporting direct use or small scale power generation projects like the one installed at Chena Hot Springs in 2006, the Granite Mountain Hot Spring, along with Division Hot Springs were identified in the GAP Report as being the two most attractive hot spring sites for additional geothermal exploration effort. 2.0 Proposed Work Plan Building off the GAP report, a ‘Proposal to Conduct Additional Reconnaissance Study of the Granite Mountain Geothermal Area’ was submitted to the NANA Development Corporation by the Alaska Center for Energy & Power (ACEP) at the University of Alaska Fairbanks in July 2009, and was ultimately approved for funding in the amount of $60,000. The GAP Report recommended performing a remote sensing study of Granite Mountain and Division Hot Springs, performing a soil geochemistry survey, and running ground-based geophysical surveys as Phase 2 activities. A future Phase 3 was intended to utilize deep temperature-gradient holes and perform a detailed technical and economic feasibility study. The ACEP proposal to conduct additional reconnaissance was different from the Phase 2 exploration recommendations in the GAP Report due to the limited budget and time frame allowed for completing the work during the 2009 season. To meet the time and budget constraints, the ACEP proposal involved chemically sampling the local hot and cold waters at Granite Mountain to determine the likely resource temperature with more precision than the GAP Report and to assess the heat flow from the Granite Mountain geothermal system. These values are critical to determining the maximum developable capacity of the resource. 2

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