Unnamed (east tip of Sutwik Island)

Occurrence in Alaska, United States with commodity Copper

Geologic information

Identification information

Deposit ID 10308352
Record type Site
Current site name Unnamed (east tip of Sutwik Island)

Geographic coordinates

Geographic coordinates: -156.90244, 56.49932 (WGS84)
Relative position This site is located on the eastern tip of Sutwik Island near Foggy Cape (MacKevett and Holloway, 1977, locality 6). Site location is accurate to within 2 miles.
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Geographic areas

Country State
United States Alaska


Commodity Importance
Copper Primary

Materials information

Materials Type of material
Chalcopyrite Ore
Pyrite Ore
Quartz Gangue


  • (Local) The alteration is unknown but it probably includes propylitic and sericitic types.

Mineral occurrence model information

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

Nearby scientific data

(1) -156.90244, 56.49932

Comments on the geologic information

  • Geologic Description = The rocks at this site consist of basaltic plug domes intruding sedimentary strata of the Meshik Formation (Detterman and others, 1981). The site has been described as a porphyry-type occurrence consisting of a strongly altered zone in Tertiary hypabyssal and volcanic rocks (MacKevett and Holloway, 1977). No mention is made of ore or gangue minerals present.
  • Age = Tertiary.

Economic information

Economic information about the deposit and operations

Development status Occurrence

Comments on exploration

  • Status = Inactive

Mining district

District name Alaska Peninsula

Reference information

Links to other databases

Agency Database name Acronym Record ID Notes
USGS Alaska Resource Data File ARDF SW004

Bibliographic references

  • Deposit

    Cox, D.P., Detra, D.E., and Detterman, R.L., 1981, Mineral resource maps of the Chignik and Sutwik Island quadrangles, Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF- 1053-K, 2 map sheets, scale 1:250,000.

  • Deposit

    Detterman, R.L., Miller, T.P., Yount, M.E., and Wilson, F.H.,1981, Geologic map the Chignik and Sutwik Island quadrangles Alaska: U.S. Geologic Survey Miscellaneous Investigations Series Map I- 1229, 1 map sheet, scale 1:250,000.

  • Deposit

    MacKevett, E.M., Jr., and Holloway, C.D., 1977, Map showing metalliferous mineral deposits in the western part of southern Alaska: U.S. Geological Survey Open-File Report 77-169-F, 38 p., 1 sheet, scale 1:1,000,000.

Comments on the references

  • Primary Reference = MacKevett and Holloway, 1977

General comments

Subject category Comment text
Deposit Model Name = Porphyry copper (Cox and Singer, 1986, model 17)
Deposit Other Comments = This site is on land selected by the Koniag Native Corporation.

Reporter information

Type Date Name Affiliation Comment
Reporter 31-JAN-00 S.H. Pilcher U.S. Geological Survey