Okok River

Occurrence in Alaska, United States with commodity Copper

Geologic information

Identification information

Deposit ID 10003128
MRDS ID A015660
Record type Site
Current site name Okok River
Related records 10233773

Geographic coordinates

Geographic coordinates: -171.40319, 63.36912 (WGS84)
Relative position The Okok River flows southeast to its mouth on the southwest coast of St. Lawrence Island (about 1 mile west of Singikpak Point). The site, located within 1/2 mile, is on the west side of the river valley about 2 1/2 miles upstream of the mouth. It is locality 10 of Cobb (1972) and Cobb (1980) summarized relevant references under the name 'Okok R.'.
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Geographic areas

Country State
United States Alaska

Commodities

Commodity Importance
Copper Primary

Materials information

Materials Type of material
Chalcopyrite Ore
Ilmenite Gangue
Magnetite Gangue
Pyrite Gangue

Alteration

  • (Local) The gabbro is apparently unaltered.

Host and associated rocks

  • Host or associated Host
    Rock type Plutonic Rock > Mafic Intrusive Rock > Gabbro

Nearby scientific data

(1) -171.40319, 63.36912

Comments on the geologic information

  • 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).
  • 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).

Economic information

Economic information about the deposit and operations

Development status Occurrence
Commodity type Metallic

Comments on exploration

  • Status = Inactive

Mining district

District name Bering Sea

Comments on the workings information

  • 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).

Reference information

Links to other databases

Agency Database name Acronym Record ID Notes
USGS Mineral Resources Data System MRDS A015660
Unknown MF MF 0465-10
USGS Alaska Resource Data File ARDF SL012

Bibliographic references

  • 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.

  • 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.

  • 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.

  • 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.

  • 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.

Comments on the references

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

General comments

Subject category Comment text
Deposit Model Name = Disseminated sulfide minerals in gabbro.

Reporter information

Type Date Name Affiliation Comment
Reporter 10-SEP-1998 Travis L. Hudson Applied Geology