Unnamed Occurrence (ARDF - BN092; near Granite Creek), Koyuk District, Nome Borough, Alaska, USA
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Geology: Quartz-aplite breccia fillings and quartz-fluorite veins cut black slate hornfels (Miller and Grybeck, 1973). These contain up to several percent galena and sphalerite and minor chalcopyrite. Analytical data for four samples were reported by Miller and Grybeck (1973, Table 2). Two samples of aplite with disseminated galena and sphalerite each contain greater than 20,000 ppm Pb and greater than 10,000 ppm Zn; they also contain 30 and 50 ppm Ag and one contains 0.1 ppm Au. The other two samples from this locality contain anomalous Pb, Zn, and Ag as well as 0.02 and 0.04 ppm Au. This occurrence is in the hanging wall of the major normal fault that marks the southern boundary of the high grade metamorphic rocks and granitic intrusives of the Bendeleben Mountains (Till and others, 1986). Mining claims existed in this area in 1975 (Hudson and others, 1977).
Workings: Workings have not been reported but mining claims have been staked in the area and were current as of 1975 (Hudson and others, 1977).
Age: Cretaceous ?; Epigenetic mineralization in metamorphic rocks of Seward Peninsula is primarily of Cretaceous age.
Alteration: Quartz-fluorite veining (and possibly other alteration of intrusive rocks) is present.
Commodities (Major) - Ag, Au, Pb, Zn
Development Status: None
Deposit Model: Polymetallic veins ? (Cox and Singer, 1986; model 22c ?)
Mineral List
5 entries listed. 5 valid minerals.
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References
Gamble, B.M., 1988, Non-placer mineral occurrences in the Solomon, Bendeleben, and southern part of the Kotzebue quadrangles, western Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-1838-B, 13 p., 1 sheet, scale 1:250,000. Hudson, T.L., Miller, M. L., and Pickthorn, W. J., 1977, Map showing metalliferous and selected nonmetalliferous mineral deposits, Seward Peninsula, Alaska: U.S. Geological Survey Open-File Report 77-796-B, 46 p., 1 sheet, scale 1:1,000,000. Miller, T.P., and Grybeck, D.J., 1973, Geochemical survey of the eastern Solomon and southeastern Bendeleben quadrangles, Seward Peninsula, Alaska: U.S. Geological Survey Open-File Report 553, 115 p. Till, A.B., Dumoulin, J.A., Gamble, B. ., Kaufman, D.S., and Carroll, P.I., 1986, Preliminary geologic map and fossil data, Soloman, Bendeleben, and southern Kotzebue quadrangles, Seward Peninsula, Alaska: U.S. Geological Survey Open-File Report 86-276, 10 p., 3 plates, scale 1:250,000.