Unnamed (west of Togiak Lake)

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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MRDS mine locations are often very general, and in some cases are incorrect. Some mine remains have been covered or removed by modern industrial activity or by development of things like housing. The satellite view offers a quick glimpse as to whether the MRDS location corresponds to visible mine remains.

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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