Unnamed (on Kupreanof Peninsula)

Occurrence in Alaska, United States with commodities Copper, Silver, Zinc

Geologic information

Identification information

Deposit ID 10308211
Record type Site
Current site name Unnamed (on Kupreanof Peninsula)

Geographic coordinates

Geographic coordinates: -159.57243, 55.78926 (WGS84)
Relative position This occurrrence is on the Kupreanof Peninsula, near the head of Osterback Creek (MacKevett and Holloway, 1977, locality 6; Wilson and others, 1988, locality 6). The map site is at an elevation of 1,500 feet, 0.2 mile southeast of the center of sec. 1, T. 51 S., R. 67 W., of the Seward Meridian. The location is accurate to within 2 miles.
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Geographic areas

Country State
United States Alaska


Commodity Importance
Copper Primary
Silver Secondary
Zinc Secondary


  • (Local) Hollister (1978) reported phyllic, propylitic, and argillic alteration in an area marked by a large color anomaly.

Nearby scientific data

(1) -159.57243, 55.78926

Comments on the geologic information

  • Geologic Description = There are contradictory descriptions of the geology of the area of this occurrence. MacKevett and Holloway (1977) and Hollister (1978) reported several altered zones in Tertiary bedded rocks, in or near Tertiary granitic plutons. Hollister (1978) classified the plutons as quartz diorite and reported a color anomaly marking areas of stockwork mineralization accompanied by phyllic, argillic, and propylitic alteration. In the mid-1980s the U.S. Geological Survey mapped the rocks in the area as Eocene to Oligocene Meshik Formation, and did not report any granitic rocks (Wilson and others, 1995). They collected few samples that were reported to be anomalous in copper, silver, and zinc (Wilson and others, 1988).
  • 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

Comments on the workings information

  • Workings / Exploration = The U.S. Geological Survey mapped and sampled this area in the mid-1980's. Samples 83AYb590-594 and 83AWs78-81 were reported to be anomalous in copper, zinc, and silver (Wilson and others, 1988).

Reference information

Links to other databases

Agency Database name Acronym Record ID Notes
USGS Alaska Resource Data File ARDF SB006

Bibliographic references

  • Deposit

    Hollister, V.F., 1978, Geology of the porphyry copper deposits of the Western Hemisphere; New York, Society of Mining Engineering, American Institute of Mining, Metallurgy, and Petroleum Engineers Incorporated, 218 p.

  • Deposit

    Angeloni, L.M., Wilson, F.H., and Sutlet, S., 1985, Map and tables showing preliminary rock geochemical data, Port Moller, Stepovak Bay, and Simeonof Island quadrangles, Alaska: U.S. Geological Survey Open-File Report 85-470, 179 p., 1 map sheet, scale 1:250,000.

  • Deposit

    Wilson, F.H., White, W.H., and DuBois, G.D., 1988, Brief descriptions of mines, prospects, and mineral occurrences in the Port Moller and Stepovak Bay quadrangles, Alaska Peninsula: U.S. Geological Survey Open-File Report 88-666, 128 p., scale 1:250,000.

  • Deposit

    Wilson, F.H., Detterman, R.L., Miller, J. W., and Case, J.E., 1995, Geologic map of the Port Moller, Stepovak Bay, and Simeonof Island quadrangles, Alaska: U.S. Geological Survey Miscellaneous Investigation Series Map I-2272, 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 = Wilson and others, 1988

General comments

Subject category Comment text
Deposit Other Comments = This occurrence is in the Alaska Peninsula National Wildlife Refuge, near the boundary of land selected by the Bristol Bay Native Corporation.

Reporter information

Type Date Name Affiliation Comment
Reporter 07-NOV-00 S.H. Pilcher U.S. Geological Survey