Okok River

The Okok River 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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Site Name

Primary: Okok River

Commodity

Primary: Copper

Location

State: Alaska
District: Bering Sea

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: The gabbro is apparently unaltered.

Rocks

Not available

Analytical Data

Not available

Materials

Ore: Chalcopyrite
Gangue: Pyrite
Gangue: Magnetite
Gangue: Ilmenite

Comments

Comment (Geology): Age = Disseminated sulfide minerals in gabbro of the Okok River drainage would be Permian in age, based on the results of two K/Ar age determinations for this assemblage (221 +/- 7 and 244 +/- 7 Ma; Patton and Csejtey, 1980).

Comment (Reference): Primary Reference = Patton and Csejtey, 1971 (PP 684-C)

Comment (Exploration): Status = Inactive

Comment (Workings): Workings / Exploration = Two grab samples of gabbro contain 700 ppm copper (Patton and Csejtey, 1971, P. C8). Stream sediments in the upper Okok River drainage do not have anomalous metal contents (Patton and Csejtey, 1972).

Comment (Geology): Geologic Description = Bedrock in the lower Okok River valley is a Triassic to Permian age assemblage characterized by gabbro and diabase intrusions (Patton and Csejtey, 1980). Gabbro samples from this assemblage along the Okok River contain disseminated chalcopyrite, ilmenite, magnetite, and pyrite. Two grab samples of this gabbro contain 700 ppm copper (Patton and Csejtey, 1971, P. C8). Stream sediments in the upper Okok River drainage do not have anomalous metal contents (Patton and Csejtey, 1972).

Comment (Deposit): Model Name = Disseminated sulfide minerals in gabbro.

References

Reference (Deposit): Cobb, E.H., 1972, Metallic mineral resources map of the Saint Lawrence quadrangle, Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-465, 1 sheet, scale 1:250,000.

Reference (Deposit): Patton, W.W., Jr., and Csejtey, Bela, Jr., 1972, Analyses of stream sediment and rock samples from St. Lawrence Island, Alaska, 1966-1971: U.S. Geological Survey Open-File Report 72-293, 78 p.

Reference (Deposit): Patton, W.W., Jr., and Csejtey, Bela, Jr., 1971, Preliminary geologic investigations of western St. Lawrence Island, Alaska: U.S. Geological Survey Professional Paper 684-C, p. C1-C15.

Reference (Deposit): Cobb, E.H., 1980, Summaries of data and lists of references to metallic and selected nonmetallic mineral deposits in fifteen quadrangles in southwestern and west-central Alaska: U.S. Geological Survey Open-File Report 80-909, 103 p.

Reference (Deposit): Patton, W.W., Jr., and Csejtey, Bela, Jr., 1980, Geologic map of St. Lawrence Island, Alaska: U.S. Geological Survey Miscellaneous Investigation Series Map I-1203, scale 1:250,000.

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