Unnamed Prospect (ARDF - ID034; west of upper Yankee Creek), Iditarod District, Yukon-Koyukuk Borough, Alaska, USA
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Geology: This deposit at this prospect is a thin gold-quartz-sulfide vein that cuts a quartz-feldspar porphyry dike near its contact with sandstone of the Upper Cretaceous, Kuskokwim group (Miller and Bundtzen, 1994). The dike, as partly exposed in rubble crop, is about 25 feet thick and strikes about N70E. The vein, which is probably subparallel to the dike, is about 16 inches thick The vein contains about 2 percent, fine-grained arsenopyrite and less abundant, bladed stibnite crystals. Free gold occurs in pockets of iron oxide oxidized from the sulfides. One sample of sulfide-bearing quartz vein contained 7.02 parts per million gold (Bundtzen and Laird, 1983; McGimsey and others, 1988). The quartz-feldspar porphyry dike is part of the dike-sill complex associated with the Ganes-Yankee Creek fault zone (Bundtzen and Laird, 1983; Bundtzen and Miller, 1997).
Workings: Prior to World War II, the prospect was explored by two elongate pits about 50 feet apart. West Gold Inc. explored the area and collected soil samples in the prospect area in 1989; Placer Dome Exploration collected soils in the area in 1997. North Star Exploration, Inc. conducted exploration and sampled rocks and soils in 1998 and 2001.
Age: Biotite from a dike at the Telephone Hill prospect (ID035) nearby has a 40Ar/39Ar age of 70.6 Ma (Bundtzen and others, 2000).
Alteration: The quartz-feldspar dike is moderately sericitized.
Commodities (Major) - Au; (Minor) - Ag, As, Sb
Development Status: None
Deposit Model: Low sulfide gold-quartz vein or Porphyry gold-copper deposit; (Cox and Singer,
5 entries listed. 4 valid minerals.
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Bundtzen, T.K., and Laird, G.M., 1983, Geologic map of the Iditarod D-1 quadrangle, Alaska: Alaska Division of Geological and Geophysical Surveys Professional Report 78, scale 1:63,360. 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., Bouley, B.A., Noyes, H.J., and Nokleberg, W.J., 2000, Regional metallogenesis of central Alaska: Society of Mining, Metallurgy, and Exploration Annual Meeting, Salt Lake City, Utah, February 28-March 1, 2000, p.1-29. Hollister, V.F., 1992, On a proposed plutonic porphyry gold deposit model: Nonrenewable Resources, vol. 1, p. 293-302. 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.