Unnamed

Occurrence in Alaska, United States with commodity Copper

Geologic information

Identification information

Deposit ID 10003125
MRDS ID A015657
Record type Site
Current site name Unnamed

Geographic coordinates

Geographic coordinates: -171.8132, 63.47912 (WGS84)
Relative position This site is 3 miles east of the mouth of the Moghoweyik River on western St. Lawrence Island. It is at an elevation of about 300 feet on the north side of the river valley and is probably located within 1/2 mile. It is locality 5 of Cobb (1972) and Cobb (1980) summarized relevant references under the name 'Unnamed occurrence'.
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Geographic areas

Country State
United States Alaska

Commodities

Commodity Importance
Copper Primary

Materials information

Materials Type of material
Chalcopyrite Ore
Pyrite Gangue

Alteration

  • (Local) Alteration has not been described.

Mineral occurrence model information

Model code 53
USGS model code 17
Deposit model name Porphyry Cu
Mark3 model number 4

Host and associated rocks

  • Host or associated Host
    Chronological age 108
    Uncertainty 3.2
    Stratigraphic age (youngest) Early Cretaceous

Nearby scientific data

(1) -171.8132, 63.47912

Comments on the geologic information

  • Geologic Description = Chalcopyrite mineralization here is in the Sevuokuk pluton, a mid-Cretaceous (108 +/- 3.2 Ma) composite body that includes biotite hornblende quartz monzonite and biotite quartz monzonite phases (Csejtey, Patton, and Miller, 1971; Patton and Csejtey, 1980). At this site, pyrite and chalcopyrite are disseminated in botite quartz monzonite. One grab sample contained 1,000 ppm copper, 15 ppm molybdenum, and 1.5 ppm silver (Patton and Csejtey, 1971, p. C8). Other characteristics of this site, such as size and alteration, have not been described.
  • Age = Mid-Cretaceous, the age of the host Sevuokuk pluton (108 +/- 3.2 Ma; Patton and Csejtey, 1980).
  • Age = Chron age is for Host Rock.

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 = One grab sample contained 1,000 ppm copper, 15 ppm molybdenum, and 1.5 ppm silver (Patton and Csejtey, 1971, p. C8).

Reference information

Links to other databases

Agency Database name Acronym Record ID Notes
USGS Mineral Resources Data System MRDS A015657
Unknown MF MF 465-5
USGS Alaska Resource Data File ARDF SL005

Bibliographic references

  • 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., 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., 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 = Fracture fillings, veins, and disseminations of chalcopyrite in granitic rock. Deposit model 17 (?); porphyry Cu

Reporter information

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