The Unnamed (west of Togiak Lake) is a copper 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 Togiak Lake) MRDS details
Site Name
Primary: Unnamed (west of Togiak Lake)
Commodity
Primary: Copper
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
Not available
Orebody
Not available
Structure
Not available
Alterations
Alteration Type: L
Alteration Text: Silicification.
Rocks
Role: Associated
Age Type: Associated Rock
Age in Years: 67.500000+-3.000000
Dating Method: K-Ar
Material Analyzed: Hornblende
Age Young: Late Cretaceous
Role: Associated
Age Type: Associated Rock
Age in Years: 6.700000+-2.000000
Dating Method: K-Ar
Material Analyzed: Biotite
Age Young: Late Cretaceous
Analytical Data
Not available
Materials
Ore: Malachite
Ore: Chalcopyrite
Gangue: Quartz
Comments
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). At this location, along the east contact of the granitic pluton, chalcopyrite and malachite occur in a small quartz vein cutting quartz diorite (Hoare and Cobb, 1977, p. 49).
Comment (Exploration): Status = Inactive
Comment (Geology): Age = Chronological age is for granitic pluton in the area.
Comment (Workings): Workings / Exploration = Reconnaissance stream-sediment sampling has been completed in the area.
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 near this locality are 63.7 +/- 2 Ma on biotite and 67.5 +/-3 Ma on hornblende (Hoare and Coonrad, 1978).
Comment (Reference): Primary Reference = Hoare and Cobb, 1977
Comment (Deposit): Model Name = Vein
References
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): 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): 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.
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