|Quadrangle map, 1:250,000-scale||HU|
|Quadrangle map, 1:63,360-scale||A-2|
|Nearby scientific data||Find additional scientific data near this location|
|Location and accuracy||This occurrence is located on the west side of Indian River about 4.25 miles south-southwest of the summit of Indian Mountain. The occurrence is along a dirt road at an elevation of about 1,200 feet, about 0.4 mile north of the center of section 14, T. 7 N., R. 24 E. of the Kateel River Meridian. The location is accurate.|
This occurrence consists of disseminated pyrite and sphalerite in fresher specimens of otherwise highly altered intrusive rocks that cut Upper Jurassic(?) and Lower Cretaceous andesite (Miller and Ferrians, 1968). Both the andesite and intrusives show considerable oxidation and alteration. Samples contain anomalous lead, zinc, copper, molybdenum, gold, and silver, with up to 15 ppm silver, 1,000 ppm copper, 30 ppm molybdenum, 3,000 ppm lead, and 700 ppm zinc (Miller and Ferrians, 1968). A float sample of silicified, vuggy meta-rhyolite(?) contains disseminated pyrite and possibly tetrahedrite(?); this sample contains 8.3 ppm gold, 11.5 ppm silver, 794 ppm copper, 1,771 ppm lead, and 998 ppm zinc (Kurtak and others, 1999).Nokleberg and others (1996) describe, without a specific location, the deposit in the Indian Mountain area as a porphyry Cu-Au system. This system, which likely includes all the individual lode occurrences within the area, consists predominately of chalcopyrite- and tourmaline-bearing intrusive breccias that are surrounded by concentric phyllic-argillic-propylitic alteration halos. A pyrite zone surrounds the intrusive rocks.
|Geologic map unit||(-153.758226529437, 66.0154616990036)|
|Mineral deposit model||Porphyry Cu-Mo? (Cox and Singer, 1986; model 21a?).|
|Mineral deposit model number||21a?|
|Age of mineralization||The andesite that host the deposit is Cretaceous or early Tertiary.|
|Alteration of deposit||The intrusive rocks and andesite are oxidized and altered but no details of the alteration are described.|
|Workings or exploration||Only surface sampling.|
|Indication of production||None|
Bottge, R.G., 1988, Maps summarizing land availability for mineral exploration and development in western Alaska, 1986: U.S. Bureau of Mines Open-File Report 14-88, 38 quadrangle overlays.
Cobb, E.H., 1972, Metallic mineral resources map of the Hughes quadrangle, Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-458, 1 sheet, scale 1:250,000.
Cobb, E.H., 1975, Summary of references to mineral occurrences (other than mineral fuels and construction materials) in five quadrangles in west central Alaska (Hughes, Kotzebue, Melozitna, Selawik, Shungnak): U.S. Geological Survey Open-File Report 75-627, 58 p.
Cobb, E.H., and Miller, T.P., 1981, Summaries of data on and lists of references to metallic and selected nonmetallic mineral occurrences in the Hughes, Kotzebue, Melozitna, Selawik and Shungnak quadrangles, west-central Alaska; Supplement to Open-File Report 75-627; Part B, Lists of references to January 1, 1981: U.S. Geological Survey Open-File Report 81-847-B, 14 p.
Eberlein, G.D., Chapman, R.M., Foster, H.L., and Gassaway, J.S., 1977, Map and table describing known metalliferous and selected nonmetalliferous mineral deposits in central Alaska: U.S. Geological Survey Open-File Report 77-168-D, 132 p., 1 sheet, scale 1:1,000,000.
Kurtak, J.M., Klieforth, R.F., Clark, J.M., and Maclean, E.A., 2002, Mineral investigations in the Koyukuk mining district, northern Alaska: Final Report: U.S. Bureau of Land Management Technical Report 50, v. 1 and 2, 845 p.
Kurtak, J.M., Klieforth, R.F., Clark, J.M., and Williams, E.M., 1999, Mineral investigations in the Koyukuk mining district, northern Alaska--Progress Report: U.S. Bureau of Land Management Open-File Report 74, 158 p.
Miller, T.P., and Ferrians, O.J., Jr., 1968, Suggested areas for prospecting in the central Koyukuk River region, Alaska: U.S. Geological Survey Circular 570, 12 p.
Nokleberg, W.J., Bundtzen, T.K., Dawson, K.M., Eremin, R.A., Goryachev, N.A., Koch, R.D., Ratkin, V.V, Rozenblum, I.S., Shpikerman, V.I., Frolov, Y.F., Gorodinsky, M.E., Melnikov, V.D., Diggles, M.F., Ognyanov, N.V., Petrachenko, E.D., Petrochenko, R.I., Pozdeev, A.I., Ross, K.V., Wood, D.H., Grybeck, D., Khanchuck, A.I., Kovbas, L.I., Nekrasov, I.Y., and Sidorov, A.A., 1996, Significant metalliferous and selected non-metalliferous lode mineral deposits and placer districts, and for metallogenesis of the Russian Far East, Alaska, and the Canadian Cordillera: U.S. Geological Survey Open-File Report 96-513-B, 385 p.; U.S. Geological Survey Open-File Report 96-513-B, 385 p. (CD-ROM format).
|Reporters||J.M. Britton (Anchorage)|
|Last report date||8/1/2002|