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Unnamed Occurrences (ARDF - SP023; headwaters of Kobuk River), Shungnak District, Yukon-Koyukuk Borough, Alaska, USA

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Located within Gates of the Arctic National Park.
Location: This site represents two occurrences in an east-trending mile-long area near the headwaters of the Kobuk River. The map site is at the center of the area, sec. 15, T. 22 N., R. 20 E., of the Kateel River Meridian. Location is accurate to within 2000 ft. The site corresponds to localities 47 and 48 of Grybeck and Nelson (1981).
Geology: The occurrences consist of sparse float of vein or segregation quartz in foliated porphyritic granite of Devonian age (Nelson and Grybeck, 1980) and of abundant skarn near the contact of the granite with Paleozoic carbonates (Nelson and Grybeck, 1981). Selected samples of float contain 5000 ppm As, 200 ppm Be, 30 to 100 Bi ppm, 200 ppm Sb, and 500 to 1000 ppm Sn. These occurrences are similar to other contact-metamorphic deposits elsewhere in the Brooks Range (Newberry and others, 1986).
Age: Devonian; related to the intrusion of the Devonian pluton.
Alteration: Skarn.

Commodities (Major) - Sn; (Minor) - As, Be, Bi, Sb
Development Status: None
Deposit Model: Skarn (Cox and Singer, 1986; model 14b)

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References

Grybeck, D.J., and Nelson, S.W., 1981, Mineral deposit map of the Survey Pass quadrangle, Brooks Range, Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-1176-F, 1 sheet, scale 1:250,000. Nelson, S.W., and Grybeck, D.J., 1980, Geologic map of the Survey Pass quadrangle, Brooks Range, Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-1176-A, 2 sheets, scale 1:250,000. Newberry, R.J., Dillon, J.T., and Adams, D.D., 1986, Regionally metamorphosed calc-silicate-hosted deposits of the Brooks Range, northern Alaska: Economic Geology, v. 81, p. 1728-1752.

 
Mineral and/or Locality  
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