Kangik River

Occurrence in Alaska, United States with commodity Copper

Geologic information

Identification information

Deposit ID 10003563
MRDS ID A106321
Record type Site
Current site name Kangik River

Geographic coordinates

Geographic coordinates: -171.72321, 63.56912 (WGS84)
Relative position Kangik River flows northeast into Aghnaghak Lagoon on the northwest coast of St. Lawrence Island. This site is in hornfels peripheral to the east side of the Sevuokuk pluton, 4.5 miles northeast of Vngyat Point' (Patton and Csejtey, 1971, p. C15). The site, probably located within 0.5 miles, is apparently on the Kangik River. This is locality 2 of Cobb (1972) and Cobb (1980) summarized relevant references under the name 'Kangik R.'.
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Geographic areas

Country State
United States Alaska

Commodities

Commodity Importance
Copper Primary

Comments on the commodity information

  • Ore Material = Native copper

Alteration

  • (Local) The Cretaceous volcanic assemblage is thermally metamorphosed to hornblende hornfels and albite-epidote hornfels facies where it is in contact with granitic rocks but elsewhere it is commonly propylitically altered (Patton and Csejtey, 1980).

Nearby scientific data

(1) -171.72321, 63.56912

Comments on the geologic information

  • Geologic Description = A small amount of native copper was found in float of a mafic volcanic hornfels 4 1/2 miles northeast of Vngyat Point (Patton and Cjestey, 1971, p. C15).??The hornfels is apparently in the east contact zone of the Sevuokuk pluton. The Sevuokuk pluton is an elongate and composite intrusion that makes up the western coastal headlands of St. Lawrence Island (Patton and Csejtey, 1980). It includes biotite hornblende quartz monzonite and biotite quartz monzonite phases (Csejtey, Patton, and Miller, 1971). The copper-bearing hornfels occurrence is apparently in the contact zone of a biotite hornblende quartz monzonite phase where it intrudes a Cretaceous volcanic assemblage of diverse lithologies and compositions. One K/Ar age determination for the Sevuokuk pluton gave an age of 108 +/- 3.2 Ma (Patton and Csejtey, 1980).
  • Age = Mid-Cretaceous, the age of the Sevuokuk pluton (108 +/- 3.2 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 = None

Reference information

Links to other databases

Agency Database name Acronym Record ID Notes
USGS Mineral Resources Data System MRDS A106321
USGS Alaska Resource Data File ARDF SL003

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

    Csejtey, Bela, Jr., Patton, W.W., Jr., and Miller, T.P., 1971, Cretaceous plutonic rocks of St. Lawrence Island, Alaska, a preliminary report: U.S. Geological Survey Professional Paper 750-D, p. D68-D76.

  • 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 = Copper-bearing replacements in hornfels.

Reporter information

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