The Unnamed (west of Kemuk River) is a gold, copper, and silver mine located in Alaska.
About the MRDS Data:
All mine locations were obtained from the USGS Mineral Resources Data System. The locations and other information in this database have not been verified for accuracy. It should be assumed that all mines are on private property.
Mine Info
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Unnamed (west of Kemuk River) MRDS details
Site Name
Primary: Unnamed (west of Kemuk River)
Commodity
Primary: Gold
Primary: Copper
Primary: Silver
Secondary: Zinc
Secondary: Molybdenum
Secondary: Mercury
Secondary: Lead
Location
State: Alaska
District: Bristol Bay Region
Land Status
Not available
Holdings
Not available
Workings
Not available
Ownership
Not available
Production
Not available
Deposit
Record Type: Site
Operation Category: Occurrence
Operation Type: Unknown
Years of Production:
Organization:
Significant:
Physiography
Not available
Mineral Deposit Model
Model Name: Polymetallic veins
Orebody
Not available
Structure
Not available
Alterations
Alteration Text: Silicification and oxidation.
Rocks
Role: Associated
Age Type: Associated Rock
Age in Years: 63.700000+-2.000000
Dating Method: K-Ar
Material Analyzed: Biotite
Age Young: Early Paleocene
Role: Associated
Age Type: Associated Rock
Age in Years: 67.500000+-3.000000
Dating Method: K-Ar
Material Analyzed: Hornblende
Age Young: Late Cretaceous
Analytical Data
Not available
Materials
Ore: Pyrite
Gangue: Quartz
Comments
Comment (Geology): Age = Probably Late Cretaceous. Mineralization is probably related to the granitic pluton in the area, which is part of a regionally extensive Upper Cretaceous and Lower Tertiary plutonic suite. K/Ar ages for granitic samples from the nearby pluton to the east are 63.7 +/- 2 Ma on biotite and 67.5 +/-3 Ma on hornblende (Hoare and Coonrad, 1978).
Comment (Exploration): Status = Inactive
Comment (Geology): Age = Chron age is for granitic pluton in the area.
Comment (Reference): Primary Reference = Kilburn and others, 1992
Comment (Deposit): Model Name = Polymetallic veins (Cox and Singer, 1986; model 22c)
Comment (Geology): Geologic Description = The upland between Togiak Lake and Kemuk River is cored by a large, Cretaceous(?) granitic pluton with a well-developed hornfels aureole (Hoare and Coonrad, 1978). Many stream-sediment samples in this area contain anomalous amounts of copper and manganese (Cieutat and others, 1988; Hessin and others, 1978 [OF 78-9-M]). A large north-trending, high-angle fault transects the area just to the west of Kemuk River. Hoare and Cobb (1977) reported copper-bearing minerals in volcaniclastic rocks along this fault. Large debris fans on the west side of Kemuk River contain blocks of volcanic sandstone, bleached and iron-stained argillite, and highly silicified argillite that contain milky quartz veins, disseminated pyrite, and thin pyrite veinlets (Kilburn and others, 1992). Float samples of altered argillite contain up to 27 ppm Ag, 150 ppm As, 0.4 ppm Au, greater than 5,000 ppm Ba, 1.8 ppm Hg, 52 ppm Mo, 310 ppm Pb, and 570 ppm Zn (Kilburn and others, 1992, Table 1).
Comment (Workings): Workings / Exploration = Reconnaissance stream-sediment sampling has been completed in the area.
References
Reference (Deposit): Hoare, J.M., and Cobb, E.H., 1977, Mineral occurrences (other than mineral fuels and construction materials) in the Bethel, Goodnews, and Russian Mission quadrangles, Alaska: U.S. Geological Survey Open-File Report 77-156, 98 p.
Reference (Deposit): Hoare, J.M., and Coonrad, W.L., 1978, Geologic map of the Goodnews and Hagemeister Island quadrangles region, southwestern Alaska: U.S. Geological Survey Open-File Report 78-9-B, two sheets, scale 1:250,000.
Reference (Deposit): Hessin, T.D., Taufen, P.M., Seward, J.C., Quintana, S.J., Clark, A.L., Grybeck, Donald, Hoare, J.M., and Coonrad, W.L., 1978, Geochemical and generalized geological map showing distribution and abundance of copper in the Goodnews and Hagemeister quadrangles region, southwestern Alaska: U.S. Geological Survey Open-File Report 78-9-M, scale 1:250,000.
Reference (Deposit): Cieutat, B.A., Goldfarb, R.J., and Specman, W.S., 1988, Analytical results and sample locality map of stream-sediment, heavy-mineral-concentrate, and organic material samples from the Goodnews, Hagemeister Island, and Nushagak quadrangles, southwest Alaska: U.S. Geological Survey Open-File Report 88-591, 187 p.
Reference (Deposit): Kilburn, J., Box, S.E., Goldfarb, R.J., and Gray, J.E., 1992, Geochemically anomalous areas in the eastern Goodnews Bay quadrangle, southwest Alaska, in Bradley, D. C., and Ford, A. B., eds., The U.S. Geological Survey in Alaska, Accomplishments in 1990: U. S. Geological Survey Bulletin 1999, p. 156-162.
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