Unnamed Occurrence (ARDF - ID085; southeast of VABM Willow), Iditarod District, Yukon-Koyukuk Borough, Alaska, USA
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Geology: This occurrence is a north-south trending, 4-inch-thick, iron-stained, quartz-sulfide vein in augite-rich basalt of the Upper Cretaceous and early Tertiary, Iditarod volcanics (Bundtzen, Laird, and Lockwood, 1988; Miller and Bundtzen, 1988). About 2.0 percent pyrite is found on the hanging wall of the quartz vein. The site was prospected by several old pits in previous years and the vein reportedly contained gold (Don Harris, oral communication, 1983). One grab sample contained 3.0 parts per million (ppm) tungsten, 474 ppm chromium, 111 ppm nickel, and 1,130 ppm manganese, but no gold (Bundtzen, Laird, and Lockwood, 1988). The high chrome and nickel values probably reflect background values in the mafic volcanic rocks.
Workings: The site was prospected by several old pits in previous years and the vein reportedly contained gold (Don Harris, oral communication, 1983). Surface samples were collected by Alaska Division of Geological and Geophysical Surveys in 1982 (Bundtzen Laird, and Lockwood, 1988).
Alteration: None noted.
Commodities (Major) - Au; (Minor) - W
Development Status: None
2 entries listed. 2 valid minerals.
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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. Miller, M.L., and Bundtzen, T.K., 1988, Right lateral offset solution for the Iditarod-Nixon Fork fault, western Alaska: U.S. Geological Survey Circular 1016, p. 99-103. 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.