Unnamed Prospect (ARDF - ID072; northeast of Camelback Mountain), Iditarod District, Yukon-Koyukuk Borough, Alaska, USA
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Geology: This prospect consists of a zone of quartz-sulfide veins with gradational boundaries in hornfels. The occurrence is adjacent to a small monzonite body that intrudes both the Upper Cretaceous, Kuskokwim Group and andesitic flows of the Iditarod volcanics (Bundtzen, Laird, and Lockwood, 1988; Miller and Bundtzen, 1994; Miller, Bundtzen, and Gray, 2005). The size of the deposit is unknown. One grab sample of chips from a quartz-sulfide vein contained 12.0 parts per million (ppm) silver, 15.00 percent iron, 710 ppm arsenic, 600 ppm zinc, 500 ppm lead, 70 ppm antimony, 4,200 parts per billion (ppb) mercury, 35 ppm cadmium, and 300 ppm nickel (McGimsey and others, 1988).
Workings: The area was sampled by the U.S. Geological Survey in the 1980s (McGimsey and others, 1988).
Age: Unknown; the Camelback Mountain intrusion about a mile to the south is 73.2 Ma (Bundtzen, Laird, and Lockwood, 1988).
Commodities (Major) - Ag, As; (Minor) - Cd, Ni, Pb, Sb, Zn
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., and Miller, M.L., 1997, Precious metals associated with Late Cretaceous-early Tertiary igneous rocks of southwestern Alaska, in Goldfarb, R.J., and Miller, L.D., eds., Mineral Deposits of Alaska: Economic Geology Monograph 9, p. 242-286. Bundtzen, T.K., Laird, G.M., and Lockwood, M.S., 1988, Geologic map of the Iditarod C-3 quadrangle, Alaska: Alaska Division of Geological and Geophysical Surveys Professional Report 96, 13 p., 1 sheet, 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.