|Quadrangle map, 1:250,000-scale||HU|
|Quadrangle map, 1:63,360-scale||A-6|
|Nearby scientific data||Find additional scientific data near this location|
|Location and accuracy||This prospect is east of Caribou Mountain, centered along the ridge that separates Dry Creek and Ida Gulch. The prospect is at an elevation of about 1,600 feet, about 3.2 miles east-northeast of the summit of Caribou Mountain and 3 miles west of Hogatza. The location is accurate within one-half mile.|
Geologic descriptionMiller and Ferrians (1968) collected a grab sample of pyrite-bearing quartz that contains 2.4 ppm gold, 300 ppm copper, 150 ppm lead, and 300 ppm zinc. Sediment samples from streams draining the intrusive contact are anomalous in Pb and Cu (Miller and Ferrians, 1968). Nokleberg and others (1996) subsequently described the deposit as quartz veins and a quartz stockwork in Upper Cretaceous monzonite porphyry and Lower Cretaceous-Upper Jurassic andesitic volcanic rocks. The veins and stockwork contain chalcopyrite, pyrite, and traces of molybdenite and covellite. The monzonite porphyry is altered to a phyllic-argillic-propylitic assemblage, which is distributed concentrically around the core of the intrusive. Samples contain up to 2.0% copper, 0.2% molybdenum, and 2.4 grams of gold per ton. Nokleberg and others (1996) interpret the prospect as a porphyry copper (-gold) deposit.
|Geologic map unit||(-155.837251574696, 66.1803379202464)|
|Mineral deposit model||Porphyry Cu-Au? (Cox and Singer, 1986; model 20c?).|
|Mineral deposit model number||20c?|
|Age of mineralization||The Zane Hills pluton is Cretaceous based on a K/Ar date of 81 Ma (Miller and others, 1966).|
|Alteration of deposit||A phyllic-argillic-propylitic alteration assemblage is distributed concentrically around the core of a monzonitic intrusive.|
|Workings or exploration||Surface sampling.|
|Indication of production||None|
Grybeck, Donald, 1977, Map showing known mineral deposits of the Brooks Range, Alaska: U.S. Geological Survey Open-File Report 77-166-C, 45 p., 1 sheet, scale 1:1,000,000.
Hollister, V.F., 1978, Geology of the porphyry copper deposits of the Western Hemisphere: Society of Mining Engineering, American Institute of Mining, Metallurgy, and Petroleum Engineers Inc., 218 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., Brew, D.A., and Plafker, G., 1995, Metallogenesis and tectonics of porphyry copper and molybdenum (gold, silver) and granitoid-hosted gold deposits of Alaska, in Schroeter, Tom, ed., Porphyry deposits of the northwestern Cordillera: Canadian Institute of Mining and Metallurgy Special Volume 44, p. 103-141.
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|