US Department of Energy Tribal Energy Program

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fairly high relative to other CAHSB hot springs, meaning that less pumping may be required for production. Several hot springs comprise the Division hot springs, which also have been referred to as the Shungnak hot springs and/or Selawik hot springs. They are approximately 40 miles from the Kobuk-Shungnak area and approximately 60 miles from Ambler. They are located on the north side of the Purcell Mountains, inside the Selawik National Wildlife Refuge. The lower springs are slightly cooler than the upper springs, so the thermal water upwelling location is probably topographically high. Like Hawk and South hot springs, the Division hot springs issue from within the Cretaceous-age, anomalously radioactive Wheeler Creek pluton (Miller and Johnson, 1978; see description of Wheeler Creek pluton above). Division hot springs are some of the hottest springs in the NANA region, but they are still significantly below the necessary temperature of ~80o C for Chena-type power generation. At this time, there are no geothermometer predictions of hotter fluid at depth – but this is due to a lack of data. The flow rate of the upper spring is extremely high relative to other CAHSB hot springs, which would reduce the amount of pumping required for production. Hence, based on resource factors alone, these springs should be prospective for development; however their location inside of a National Wildlife Refuge could complicate development plans. The Reed River hot springs are located in the rugged terrain of the Brooks Range, approximately 50 miles from Kobuk/Shungnak and 70 miles from Ambler, on the east bank of the Reed River. The surrounding bedrock is granite of the Igikpak pluton, but the spring is just a few miles from the contact between the pluton and the country rock (Pessel, 1975). The hot springs are located in the Gates of the Arctic National Park, and are therefore off-limits for exploration and development for the foreseeable future. Resource-wise, they are some of the coolest hot springs in the NANA region and have the lowest flow rate all of the springs. Hence, these springs should be low priority for development. It is not unreasonable to think there are concealed hydrothermal resources in the NANA region due to recent volcanics, tectonic setting, and the presence of permafrost which would both serve as a sustained, abundant water source but would also potentially mask geothermal resources at the surface. The southernmost half of the NANA region is Division Hot Springs (also called Shungnak or Selawik HS) Temp. Flow(LPM) TDS SiO2geothermometer Giggenbachgeothermometer 68oC / 154oF 820 - - - 56oC / 133oF 2070 - - - Reed River Hot Springs Temp. Flow(LPM) TDS SiO2geothermometer Giggenbachgeothermometer 57oC / 137oF 160 - - - Identifying Unmapped Geothermal Prospects in NANA Region: Geologic Setting 7

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