Unnamed Occurrence (ARDF - ID134; west of the head of Little Waldren Fork), Iditarod District, Yukon-Koyukuk Borough, Alaska, USA
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Geology: This occurrence consists of 0.4- to 1.2-inch-thick quartz-axinite veins in hornfels derived from shale and sandstone of the Upper Cretaceous, Kuskokwim Group (Miller and Bundtzen, 1994; Miller, Bundtzen, Miller, and Gray, 2004). The area is cut by faults that strike northeast. The veins are oxidized to iron oxide gossan from unknown sulfide minerals. The gossan forms as clots and isolated masses an inch or more long. The geologic map of the similar prospect at the head of Bismarck Creek (ID130) includes this prospect (Bundtzen and Miller, 1997). Grab samples of mineralization contained up to 50.0 parts per million (ppm) silver, 100 ppm arsenic, 72 ppm cadmium, 150 ppm copper, 60 ppm antimony, 150 ppm tin, and 0.70 percent zinc (McGimsey and others, 1988).
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).
Alteration: Development of axinite-quartz greisen; pervasive oxidization to gossan.
Commodities (Major) - Ag, Sn, Zn; (Minor) - As, Cd, Cu, Sb
Development Status: None
Deposit Model: Sn-polymetallic vein or Polymetallic vein (Cox and Singer, 1986; models 20b and
3 entries listed. 1 valid mineral.
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Bundtzen, T.K., Miller, M.L., and Laird, G.M., 1986, Prospect examination of the Wyrick placer/lode system, Granite Creek, Iditarod-George mining district, Iditarod B-2 quadrangle, Alaska: Alaska Division of Geological and Geophysical Surveys Public Data File Report 86-29, 10 p., 1 sheet, scale 1:200. Glavinovich, P.S., and Morgan, W.A., 1994, Report of placer testing, Wyrick Claims, Granite Creek, Alaska, for JR Mining Corporation: Unpublished report of L.E. Wyrick, 45 p. Miller, M.L., and Bundtzen, T.K., 1994, Generalized geologic map of the Iditarod quadrangle, Alaska showing potassium-argon, major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. Szumigala, D.J., 1993, Gold mineralization related to Cretaceous-Tertiary magmatism in the Kuskokwim Mountains of west-central and southwestern Alaska: Los Angeles, University of California Ph.D. dissertation, 300 p.