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  3. Mineral Resource Data System (MRDS)

Unnamed

Occurrence in Alaska, United States with commodities Copper, Zinc, Silver, Cobalt
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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 10308656
Record type Site
Current site name Unnamed

Geographic coordinates

Geographic coordinates: -153.95184, 62.33248 (WGS84)
Relative position The occurrence is in a saddle separating two northeast-trending ridgelines at an elevation of 5,500 feet (1,677 m) in the NW1/4 sec. 20, T. 26 N., R. 25 W., of the Seward Meridian. The reporter visited the site in 1981.

Site location context

Political divisions (FIPS codes)

Yukon-Koyukuk(Census area)

Alaska(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

McGrath B-2(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
Copper Primary
Zinc Critical Primary
Silver Secondary
Cobalt Critical Secondary

Comments on the commodity information

  • Gangue = peridotite
  • Ore Material = Unidentified brassy sulfides

Materials information

Materials Type of material
Olivine Gangue

Alteration

  • None.

Mineral occurrence model information

Model code 10
USGS model code 5b
Deposit model name Noril'sk Cu-Ni-PGE

Nearby scientific data

(1) -153.95184, 62.33248
ListMap

Economic information

Comments on the geologic information

  • Geologic Description = This unnamed occurrence is hosted in a northwest-trending northward-dipping mafic sill of Late Triassic (?) age, a feeder for mafic volcanics of the Tatina River Volcanics, a unit of the Mystic subterrane. Unidentified, brassy, disseminated sulfides - probably iron sulfide - occur at the base of the mafic sill. Foley (1987) reports values of 210 ppm copper, 56 ppm cobalt, 330 ppm zinc, and 0.5 grams/tonne silver from the sulfide-bearing sills.

Economic information about the deposit and operations

Development status Occurrence
Commodity type Metallic

Comments on exploration

  • Status = Inactive

Mining district

District name McGrath

Comments on the workings information

  • Workings / Exploration = The sill swarm was mapped by the reporter in 1981 (Bundtzen, Kline, and Clough, 1982). Foley (1987) reports values of 210 ppm copper, 56 ppm cobalt, 330 ppm zinc, and 0.5 grams/tonne silver from the sulfide-bearing sill.

Reference information

Comments on the references

  • Primary Reference = Foley, 1987

General comments

Subject category Comment text
Deposit Model Name = Disseminated Cu-Ni-Co (Cox and Singer, 1986; model 5b).
Deposit Other Comments = Similar to Robert's PGM (MG030), Unnamed (MG048), and Chip-Loy (MG032) deposits and prospects.

Reporter information

Type Date Name Affiliation Comment
Reporter 08-DEC-1998 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.