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Unnamed (east of upper Tunulik River)

Prospect in Alaska, United States with commodities Gold, Copper
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Sections on this page
  1. Identification information
  2. Geographic coordinates
  3. Site location context
  4. Geographic areas
  5. Commodities
  6. Materials information
  7. Host and associated rocks
  8. Nearby scientific data
  9. Economic information about the deposit and operations
  10. Mining district
  11. Links to other databases
  12. Bibliographic references
  13. General comments
  14. Reporter information

Geologic information

Identification information

Deposit ID 10307464
Record type Site
Current site name Unnamed (east of upper Tunulik River)

Geographic coordinates

Geographic coordinates: -161.5027, 59.25226 (WGS84)
Relative position This prospect is at an elevation of about 1,450 feet on the southwest flank of a ridge, about 0.6 mile east of upper Tunalik River. The map site is in the west 1/2 of section 1, T 11 S, R 73 W, of the Seward Meridian. The location is probably accurate within 1/4 mile. This is locality 4 of Kilburn and others (1993).

Site location context

Political divisions (FIPS codes)

Bethel(Census area)

Alaska(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Goodnews Bay B-7(quadrangle 1:63,360 scale)

Goodnews Bay(quadrangle 1:100,000 scale)

Goodnews Bay(quadrangle 1:250,000 scale)

Hydrologic units (watersheds)

Kuskokwim Delta(hydrologic unit)

Lower Kuskokwim River(hydrologic accounting unit)

Southwest(hydrologic subregion)

Alaska(hydrologic region)

Federal lands

Kiutsarak, Incorporated(ANCSA Village)

ANCSA Village NTVPIC(Type of land area)

NTVPIC(Federal land areas administered by NTVPIC)

Geographic areas

Country State
United States Alaska

Commodities

Commodity Importance
Gold Primary
Copper Primary

Materials information

Materials Type of material
Chalcopyrite Ore
Gold Ore
Orthoclase Gangue
Quartz Gangue

Host and associated rocks

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

Nearby scientific data

(1) -161.5027, 59.25226
ListMap

Economic information

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 diorite or gabbro with podlike segregations (?) containing 1 to 2 percent chalcopyrite (Fechner, 1988, p. 63). A local quartz-orthoclase vein, 2 inches wide, assayed 3 ppm Au and 3,000 ppm As. The stream sediment from a small creek flowing southwest to the Tunulik River from the prospect contained 4.1 ppm Au; pan concentrate from this location contained gold flakes.
  • 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 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 (Calista Corporation, unpublished data).

Reference information

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 = Vein and segregations(?) in mafic rocks

Reporter information

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

Beyond USGS

Supplemental information added by qvyshift.com. Not part of the original USGS MRDS record.

Maps centered on this site

Authoritative Alaska resources

These are landing pages for further research — the state agencies don't currently expose per-mine deep links.