Commodities
PrimaryMolybdenum, Copper, Gold, Silver
Commodity typeM
Deposit
Model53: Porphyry Cu78: Porphyry Cu-Au79: Porphyry Cu-Mo
Materials
Ore mineralsChalcopyrite, Gold, Molybdenite, Pyrite
Geology
Host rockSiltstone · Naknek Formation;Naknek Formation;Naknek Formation
Associated rockDiorite · Naknek Formation;Naknek Formation;Naknek Formation
AlterationSecondary biotite is present within the copper-bearing areas and beyond. Chlorite is present throughout the area in all rock types. Sericite is present as veinlet selvages and within the higher sulfide areas on the periphery of the system. Other periphery alteration minerals include epidote, kaolinite, montmorillonite, and pyrophyllite.
Economic & production
Development statusOccurrence
Identification
Deposit ID10001669
MRDS IDA012447
RegionNA
Data scoreB
Coordinates56.24927, -158.95246
References
Fields, E.D., 1977, 1976 Annual report: Alaska search, Chignik area-Bristol Bay region: Bear Creek Mining Company, 44 p., 22 map sheets. (Report held by the Aleut Corporation, Anchorage, Alaska.)Cox, D.P., Detra, D.E., and Detterman, R.L., 1981, Mineral resource maps of the Chignik and Sutwik Island quadrangles, Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF- 1053-K, 2 map sheets, scale 1:250,000.