Ikuk

Prospect in Alaska, United States with commodities Silver, Gold, Copper

Geologic information

Identification information

Deposit ID 10307463
Record type Site
Current site name Ikuk

Geographic coordinates

Geographic coordinates: -161.49271, 59.26926 (WGS84)
Relative position This prospect is on the divide between the headwaters of an unnamed north tributary to the Tunulik River and the Barnum Creek drainage. The prospect is in a saddle at an elevation of about 1,500 feet and about 1 mile west of a 2,298-foot summit of Ikuktlitlig Mountain It is locality 3 of Kilburn and others (1993).
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Geographic areas

Country State
United States Alaska

Commodities

Commodity Importance
Silver Primary
Gold Primary
Copper Primary

Materials information

Materials Type of material
Arsenopyrite Ore
Chalcopyrite Ore
Pyrite Ore
Pyrrhotite Ore
Biotite Gangue
Chlorite Gangue
Quartz Gangue

Alteration

  • (Local) Silicification, chloritization, and biotite replacement (?).

Host and associated rocks

  • Host or associated Host
    Stratigraphic age (youngest) Eocene
    Stratigraphic age (oldest) Jurassic

Nearby scientific data

(1) -161.49271, 59.26926

Comments on the geologic information

  • Geologic Description = A composite mafic to felsic pluton intrudes Paleozoic to Mesozoic sedimentary and volcanic rocks in this area (Hoare and Coonrad, 1978). Surface observations completed for Calista Corporation (unpublished data), identified peridotite, diorite, granodiorite, and quartz monzonite in the intrusive complex. A variably silicified, choritized, and biotite-altered, 800-foot-wide fractured zone in diorite contains chalcopyrite, arsenopyrite, pyrrhotite, and pyrite (Fechner, 1988, 61). Rock samples from the prospect contain up to 2.4 percent Cu, 25.2 ppm Ag, 0.16 ounce of gold per ton, and 0.99 percent As.
  • Age = Not known. The age of the host intrusive rock is probably Jurassic or Late Cretaceous/Early Tertiary, the age of other intrusive rocks in the region (Hoare and Coonrad, 1978).

Economic information

Economic information about the deposit and operations

Development status Prospect

Mining district

District name Goodnews Bay

Comments on the workings information

  • Workings / Exploration = Reconnaissance surface observations and sampling have been completed in the prospect area.

Reference information

Links to other databases

Agency Database name Acronym Record ID Notes
USGS Alaska Resource Data File ARDF GO024

Bibliographic references

  • Deposit

    Hoare, J.M., and Coonrad, W.L., 1978, Geologic map of the Goodnews and Hagemeister Island quadrangles region, southwestern Alaska: U.S. Geological Survey Open-File Report 78-9-B, two sheets, scale 1:250,000.

  • Deposit

    Fechner, S.A., 1988, Bureau of Mines mineral investigation of the Goodnews Bay mining district, Alaska: U.S. Bureau of Mines Open-File Report 1-88, 230 p.

  • Deposit

    Kilburn, J.E., Goldfarb, R.J., Griscom, Andrew, and Box, S E., 1993, Map showing metallic mineral resource potential in the Goodnews Bay, Hagemeister Island, and Nushagak Bay quadrangles, southwest Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-2228, 4 sheets, scale 1:250,000.

Comments on the references

  • Primary Reference = Fechner, 1988

General comments

Subject category Comment text
Deposit Model Name = Sulfide-bearing shear zone in diorite

Reporter information

Type Date Name Affiliation Comment
Reporter 20-MAR-01 Travis L. Hudson Applied Geology