A Geological and Geophysical Study of the Geothermal Energy Potential of Pilgrim Springs, Alaska

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The Pilgrim Springs geothermal area, located about 75 km north of Nome, was the subject of an intensive, reconnaissance-level geophysical and geological study during a 90-day period in the summer of 1979. The thermal springs are located in a northeast-oriented, oval area of thawed ground approximately 1.5 km{sup 2} in size, bordered on the north by the Pilgrim River. A second, much smaller, thermal anomaly was discovered about 3 km northeast of the main thawed area. Continuous permafrost in the surrounding region is on the order of 100 m thick. Present surface thermal spring discharge is {approx} 4.2 x 10{sup ... continued below

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Turner, Donald L. & Forbes, Robert B. January 1, 1980.

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Description

The Pilgrim Springs geothermal area, located about 75 km north of Nome, was the subject of an intensive, reconnaissance-level geophysical and geological study during a 90-day period in the summer of 1979. The thermal springs are located in a northeast-oriented, oval area of thawed ground approximately 1.5 km{sup 2} in size, bordered on the north by the Pilgrim River. A second, much smaller, thermal anomaly was discovered about 3 km northeast of the main thawed area. Continuous permafrost in the surrounding region is on the order of 100 m thick. Present surface thermal spring discharge is {approx} 4.2 x 10{sup -3} m{sup 3} s{sup -1} (67 gallons/minute) of alkali-chloride-type water at a temperature of 81 C. The reason for its high salinity is not yet understood because of conflicting evidence for seawater vs. other possible water sources. Preliminary Na-K-Ca geothermometry suggests deep reservoir temperatures approaching 150 C, but interpretation of these results is difficult because of their dependence on an unknown water mixing history. Based on these estimates, and present surface and drill hole water temperatures, Pilgrim Springs would be classified as an intermediate-temperature, liquid-dominated geothermal system.

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  • Report No.: UAG-R-271
  • Grant Number: DE-FC07-79ET27034
  • DOI: 10.2172/892809 | External Link
  • Office of Scientific & Technical Information Report Number: 892809
  • Archival Resource Key: ark:/67531/metadc882468

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  • January 1, 1980

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  • Sept. 21, 2016, 2:29 a.m.

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  • Dec. 9, 2016, 9:26 p.m.

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Turner, Donald L. & Forbes, Robert B. A Geological and Geophysical Study of the Geothermal Energy Potential of Pilgrim Springs, Alaska, report, January 1, 1980; United States. (digital.library.unt.edu/ark:/67531/metadc882468/: accessed August 17, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.