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  3. Mineral Resource Data System (MRDS)

Unnamed (near tributary to South Fork of Kuskokwim River)

Occurrence in Alaska, United States with commodities Arsenic, Gold, Tungsten, Cobalt, Antimony
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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. Nearby scientific data
  10. Economic information about the deposit and operations
  11. Mining district
  12. Links to other databases
  13. Bibliographic references
  14. General comments
  15. Reporter information

Geologic information

Identification information

Deposit ID 10307881
Record type Site
Current site name Unnamed (near tributary to South Fork of Kuskokwim River)

Geographic coordinates

Geographic coordinates: -153.4138, 62.04348 (WGS84)
Relative position This occurrence is located on a north-facing spur overlooking an unnamed tributary of the South Fork of the Kuskokwim River. It is at an elevation of 5,100 feet (1,555 m) in the NW1/4 sec. 36, T. 23 N., R. 23 W., of the Seward Meridian. The location is based on field mapping by D.N. Solie, formerly of the Alaska Division of Geological and Geophysical Surveys; at station no. 88DNS107. The occurrence corresponds to map number 35 in Bundtzen, Harris, and Gilbert (1997).

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 Primary
Cobalt Critical Secondary
Antimony Critical Secondary

Materials information

Materials Type of material
Arsenopyrite Ore
Galena Ore
Pyrite Ore
Quartz Gangue

Alteration

  • (Local) Sericite.

Mineral occurrence model information

Model code 106
USGS model code 25b
Deposit model name Epithermal vein, Creede
Mark3 model number 58

Nearby scientific data

(1) -153.4138, 62.04348
ListMap

Economic information

Comments on the geologic information

  • Geologic Description = This unnamed occurrence is a stockwork of pyrite-galena-quartz that cuts a small granodiorite porphyry intrusion and altered dacitic tuffs. The mineralized zone occurs near the contact between igneous rocks of the Terra Cotta Volcanic Field and Lower Cretaceous Kahiltna flysch (Bundtzen, Harris, and Gilbert, 1997). No precise structural or size measurements of the mineralized zone are available. Grab samples from talus contain up to 4,000 ppm arsenic, 2,100 ppb gold, 66 ppm cobalt, 110 ppm antimony, and 550 ppm tungsten (Bundtzen, Harris, and Gilbert, 1997).

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 = D.N. Solie discovered the mineralized area during geologic mapping for the Alaska Division of Geological and Geophysical Surveys in 1988. Grab samples from the talus contain up to 4,000 ppm arsenic, 2,100 ppb gold, 66 ppm cobalt, 110 ppm antimony, and 550 ppm tungsten (Bundtzen, Harris, and Gilbert, 1997).

Reference information

Comments on the references

  • Primary Reference = Bundtzen, Harris, and Gilbert, 1997

General comments

Subject category Comment text
Deposit Model Name = Creede epithermal vein (?) (Cox and Singer, 1986; model 25b).

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.