Unnamed Occurrence (ARDF - ID119; on lower Prince Creek), Iditarod District, Yukon-Koyukuk Borough, Alaska, USA
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Geology: This occurrence consists of two quartz-sulfide veinlets in and adjacent to a 6-foot-thick monzonite dike that intrudes hornfels derived from the Upper Cretaceous, Kuskokwim Group (Miller and Bundtzen, 1994). The two veinlets average about 1 inch thick, strike N20E and dip 75SE. Their length is unknown as exposures were limited to the placer cut. Cinnabar and scheelite were noted in one vein (T.K. Bundtzen, unpublished field data, 1984). One grab sample contained 3,400 parts per billion (ppb) gold, 10.0 parts per million (ppm) silver, 1,380 ppm tungsten, 78 ppm bismuth, and 820 ppb mercury (McGimsey and others, 1988; Bundtzen and others, 1992).
Workings: Samples were collected by the U.S. Geological Survey and Alaska Division of Geological and Geophysical Surveys in the 1980s (McGimsey and others, 1988; Bundtzen and others, 1992).
Commodities (Major) - Au; (Minor) - Ag, Bi, Hg, W
Development Status: None
Deposit Model: Polymetallic vein (Cox and Singer, 1986; model 22c).
3 entries listed. 3 valid minerals.
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Bundtzen, T.K., Miller, M.L., Laird, G.M., and Bull, K.F., 1992, Geology and mineral resources of Iditarod mining district, Iditarod B-4 and eastern B-5 quadrangles, southwestern Alaska: Alaska Division of Geological and Geophysical Surveys Professional Report 97, 46 p., 2 sheets, scale 1:63,360. McGimsey, R.G., Miller, M.L., and Arbogast, B.F., 1988, Paper version of analytical results, and sample locality map for rock samples from the Iditarod quadrangle, Alaska: U.S. Geological Survey Open-File Report 88-421-A, 110 p., 1 sheet, scale 1:250,000. Miller, M.L., and Bundtzen, T.K., 1994, Generalized geologic map of the Iditarod quadrangle, Alaska showing potassium-argon, major oxide, trace element, fossil, paleocurrent, and archeological sample localities: U.S. Geological Survey Miscellaneous Field Studies Map MF-2219-A, 48 pages; 1 sheet, scale 1:250,000. Miller, M.L., Bundtzen, T.K., and Gray, J.E., 2005, Mineral resource assessment of the Iditarod quadrangle, west-central Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-2219-B, scale 1:250,000, pamphlet.