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Unnamed (on tributary to South Fork of Kuskokwim River)

Occurrence in Alaska, United States with commodities Arsenic, Gold, Tungsten
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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. Mineral occurrence model information
  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 10307883
Record type Site
Current site name Unnamed (on tributary to South Fork of Kuskokwim River)

Geographic coordinates

Geographic coordinates: -153.4118, 62.01348 (WGS84)
Relative position This unnamed occurrence is located in the steep canyon of a northeast-flowing tributary to the South Fork of the Kuskokwim River; it is at an elevation of 3,950 feet (1,204 m) in the NW1/4 sec. 12, T. 22 N., R. 23 W., of the Seward Meridian. The reporter investigated the site in 1988; at station no. 88BT165.

Site location context

Political divisions (FIPS codes)

Bethel(Census area)

Alaska(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

McGrath A-1(quadrangle 1:63,360 scale)

McGrath SE(quadrangle 1:100,000 scale)

McGrath(quadrangle 1:250,000 scale)

Hydrologic units (watersheds)

Upper Kuskokwim River(hydrologic accounting unit)

Southwest(hydrologic subregion)

Alaska(hydrologic region)

Geographic areas

Country State
United States Alaska

Commodities

Commodity Importance
Arsenic Critical Primary
Gold Primary
Tungsten Critical Secondary

Materials information

Materials Type of material
Pyrite Ore
Quartz Gangue

Mineral occurrence model information

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

Nearby scientific data

(1) -153.4118, 62.01348
ListMap

Economic information

Comments on the geologic information

  • Geologic Description = This unnamed occurrence is a series of sheeted quartz-pyrite veins in Lower Cretaceous Kahiltna flysch adjacent to several, east-west-trending rhyolite dikes cutting the flysch (Bundtzen, Harris, and Gilbert, 1997). The quartz veins dip south and are parallel to the east-west-trending dikes. The Kahiltna flysch is locally thermally upgraded to slate. One sample contained 830 ppm arsenic, 180 ppb gold, and 710 ppm tungsten. A panned concentrate taken just below the mineralized dike swarm contained 1.00 percent tin and 1,400 ppm tungsten.

Economic information about the deposit and operations

Development status Occurrence

Comments on exploration

  • Status = Inactive

Mining district

District name McGrath

Comments on the workings information

  • Workings / Exploration = The reporter visited and sampled the site in 1988; anomalous pan concentrate samples were collected by Ellen E. Harris. One sample of sheeted veining contained 830 ppm arsenic, 180 ppb gold, and 710 ppm tungsten. A panned concentrate taken just below the mineralized dike swarm contained 1.00 percent tin and 1,400 ppm tungsten (Bundtzen, Harris, and Gilbert, 1997).

Reference information

Comments on the references

  • Primary Reference = This description

General comments

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

Reporter information

Type Date Name Affiliation Comment
Reporter 09-DEC-98 T.K. Bundtzen Pacific Rim Geological Consulting

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.