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Unnamed (west of Kemuk River)

Occurrence in Alaska, United States with commodities Silver, Gold, Copper, Mercury, Molybdenum, Lead, Zinc
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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. Alteration
  8. Mineral occurrence model information
  9. Host and associated rocks
  10. Nearby scientific data
  11. Economic information about the deposit and operations
  12. Mining district
  13. Links to other databases
  14. Bibliographic references
  15. General comments
  16. Reporter information

Geologic information

Identification information

Deposit ID 10308855
MRDS ID DE00939
Record type Site
Current site name Unnamed (west of Kemuk River)
Related records 10021687

Geographic coordinates

Geographic coordinates: -159.80272, 59.6993 (WGS84)
Relative position This occurrence is on the west side of Kemuk River, 2 miles southeast of Atshichlut Mountain. It is area 4 of Kilburn and others (1993) and also includes areas of copper-bearing mineralization noted by Hoare and Cobb (1977) along a north-trending fault west of Kemuk River (Hoare and Coonrad, 1978). The map site is at an elevation of about 1,300 feet, just east of the center of section 34, T 5 S, R 62 W, of the Seward Meridian. It is approximately located, perhaps within a mile.

Site location context

Political divisions (FIPS codes)

Dillingham(Census area)

Alaska(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Goodnews Bay C-3(quadrangle 1:63,360 scale)

Goodnews Bay NE(quadrangle 1:100,000 scale)

Goodnews Bay(quadrangle 1:250,000 scale)

Hydrologic units (watersheds)

Togiak(hydrologic unit)

Nushagak River(hydrologic accounting unit)

Southwest(hydrologic subregion)

Alaska(hydrologic region)

Federal lands

Togiak National Wildlife Refuge(National Wildlife Refuge)

National Wildlife Refuge FWS(Type of land area)

FWS(Federal land areas administered by FWS)

Geographic areas

Country State
United States Alaska

Commodities

Commodity Importance
Silver Primary
Gold Primary
Copper Primary
Mercury Secondary
Molybdenum Secondary
Lead Secondary
Zinc Critical Secondary

Materials information

Materials Type of material
Pyrite Ore
Quartz Gangue

Alteration

  • Silicification and oxidation.

Mineral occurrence model information

Model code 85
USGS model code 22c
Deposit model name Polymetallic veins
Mark3 model number 46

Host and associated rocks

  • Host or associated Associated
    Rock type
    Stratigraphic age (youngest) Early Paleocene
    Chronological age 63.7
    Dating method K-Ar
    Type of media Biotite
    Stratigraphic age (youngest) Late Cretaceous
    Chronological age 67.5
    Dating method K-Ar
    Type of media Hornblende
  • Host or associated Associated
    Rock type

Nearby scientific data

(1) -159.80272, 59.6993
ListMap

Economic information

Comments on the geologic information

  • Geologic Description = The upland between Togiak Lake and Kemuk River is cored by a large, Cretaceous(?) granitic pluton with a well-developed hornfels aureole (Hoare and Coonrad, 1978). Many stream-sediment samples in this area contain anomalous amounts of copper and manganese (Cieutat and others, 1988; Hessin and others, 1978 [OF 78-9-M]). A large north-trending, high-angle fault transects the area just to the west of Kemuk River. Hoare and Cobb (1977) reported copper-bearing minerals in volcaniclastic rocks along this fault. Large debris fans on the west side of Kemuk River contain blocks of volcanic sandstone, bleached and iron-stained argillite, and highly silicified argillite that contain milky quartz veins, disseminated pyrite, and thin pyrite veinlets (Kilburn and others, 1992). Float samples of altered argillite contain up to 27 ppm Ag, 150 ppm As, 0.4 ppm Au, greater than 5,000 ppm Ba, 1.8 ppm Hg, 52 ppm Mo, 310 ppm Pb, and 570 ppm Zn (Kilburn and others, 1992, Table 1).
  • Age = Chron age is for granitic pluton in the area.
  • Age = Probably Late Cretaceous. Mineralization is probably related to the granitic pluton in the area, which is part of a regionally extensive Upper Cretaceous and Lower Tertiary plutonic suite. K/Ar ages for granitic samples from the nearby pluton to the east are 63.7 +/- 2 Ma on biotite and 67.5 +/-3 Ma on hornblende (Hoare and Coonrad, 1978).

Economic information about the deposit and operations

Development status Occurrence
Commodity type Metallic

Comments on exploration

  • Status = Inactive

Mining district

District name Bristol Bay Region

Comments on the workings information

  • Workings / Exploration = Reconnaissance stream-sediment sampling has been completed in the area.

Reference information

Bibliographic references

  • Deposit

    Hoare, J.M., and Cobb, E.H., 1977, Mineral occurrences (other than mineral fuels and construction materials) in the Bethel, Goodnews, and Russian Mission quadrangles, Alaska: U.S. Geological Survey Open-File Report 77-156, 98 p.

  • 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

    Hessin, T.D., Taufen, P.M., Seward, J.C., Quintana, S.J., Clark, A.L., Grybeck, Donald, Hoare, J.M., and Coonrad, W.L., 1978, Geochemical and generalized geological map showing distribution and abundance of copper in the Goodnews and Hagemeister quadrangles region, southwestern Alaska: U.S. Geological Survey Open-File Report 78-9-M, scale 1:250,000.

  • Deposit

    Cieutat, B.A., Goldfarb, R.J., and Specman, W.S., 1988, Analytical results and sample locality map of stream-sediment, heavy-mineral-concentrate, and organic material samples from the Goodnews, Hagemeister Island, and Nushagak quadrangles, southwest Alaska: U.S. Geological Survey Open-File Report 88-591, 187 p.

  • Deposit

    Kilburn, J., Box, S.E., Goldfarb, R.J., and Gray, J.E., 1992, Geochemically anomalous areas in the eastern Goodnews Bay quadrangle, southwest Alaska, in Bradley, D. C., and Ford, A. B., eds., The U.S. Geological Survey in Alaska, Accomplishments in 1990: U. S. Geological Survey Bulletin 1999, p. 156-162.

Comments on the references

  • Primary Reference = Kilburn and others, 1992

General comments

Subject category Comment text
Deposit Model Name = Polymetallic veins (Cox and Singer, 1986; model 22c)

Reporter information

Type Date Name Affiliation Comment
Reporter 20-MAR-2001 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.