Unnamed Occurrences (ARDF - SP027; near head of Kobuk River), Koyukuk District, Yukon-Koyukuk Borough, Alaska, USA
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Location: This site represents two occurrences in a north-trneding, mile-long area near the head of the Kobuk River. The center of the area is in the N1/2 of sec. 17, T. 22 N., R. 22 E., of the Kateel River Meridian. The location is accurate to within 2000 ft. The site corresponds to localities 53 and 54 of Grybeck and Nelson (1981).
Geology: The occurrences consist of small skarn deposits adjacent to Devonian granite and Paleozoic metamorphic rocks (Nelson and Grybeck, 1980). Selected float samples contain 200 ppm Be, 200 to 500 ppm Bi, 500 ppm W, 1000 ppm Sn, and 500 to 2000 ppm Zn. The occurrences are similar to other skarn deposits in the Brooks Range (Newberry and others, 1986).
Age: Devonian; related to the intrusion of Devonian pluton.
Alteration: Calc-silicate minerals.
Commodities (Major) - Sn, W, Zn; (Minor) - Be, Bi
Development Status: None
Deposit Model: Skarn (Cox and Singer, 1986; model 14b)
No entries listed.
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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.