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  3. Mineral Resource Data System (MRDS)

Unnamed

Occurrence 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. 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 10000726
MRDS ID A011365
Record type Site
Current site name Unnamed

Geographic coordinates

Geographic coordinates: -147.42281, 63.69964 (WGS84)
Relative position This occurrence is at an elevation of about 5,700 feet in the northwest wall of the glacier at the head of the West Fork Little Delta River. The site is in the SE1/4 of sec. 18, T. 14 S., R. 2 E., of the Fairbanks Meridian. The location is accurate to within 2,000 feet. This is location 10 of Sherwood and others (1976).

Site location context

Political divisions (FIPS codes)

Southeast Fairbanks(Census area)

Alaska(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Healy C-1(quadrangle 1:63,360 scale)

Mount Hayes NW(quadrangle 1:100,000 scale)

Healy(quadrangle 1:250,000 scale)

Hydrologic units (watersheds)

Alaska(hydrologic region)

Geographic areas

Country State
United States Alaska

Commodities

Commodity Importance
Gold Primary
Copper Primary

Materials information

Materials Type of material
Chalcopyrite Ore
Pyrite Ore

Alteration

  • (Local) Local conspicuous iron staining.

Mineral occurrence model information

Model code 91
USGS model code 24b
Deposit model name Massive sulfide, Besshi (Japanese deposits)
Mark3 model number 30

Host and associated rocks

  • Host or associated Host
    Rock type
    Stratigraphic age (youngest) Triassic

Nearby scientific data

(1) -147.42281, 63.69964
ListMap

Economic information

Comments on the geologic information

  • Geologic Description = The country rocks in the area of this occurrence are the Devonian Yanert Fork sequence, an intensely deformed, thick marine sequence dominantly of metasedimentary and metavolcanic rocks. Most of the sequence is siliceous mudstone, argillite, slate, phyllite, semischist, impure quartzite, and metachert. The sequence is intruded by gabbroic dikes and sills (Wilson and others, 1998). The occurrence consists of chalcopyrite and pyrite disseminations in gabbro, and of a gossan zone near a gabbro sill. Samples contained 833 ppm copper and 0.2 to 0.5 ppm gold (Sherwood and others, 1976).
  • Age = Gabbro hostrocks are undated but may be Triassic.
  • Age = Host rock is Triassic.

Economic information about the deposit and operations

Development status Occurrence
Commodity type Metallic

Comments on exploration

  • Status = Inactive

Mining district

District name Bonnifield

Comments on the workings information

  • Workings / Exploration = Surface sampling only. Samples contained 833 ppm copper and 0.2 to 0.5 ppm gold (Sherwood and others, 1976).

Reference information

Comments on the references

  • Primary Reference = Sherwood and others, 1976

General comments

Subject category Comment text
Deposit Model Name = Besshi massive sulfide(?) (Cox and Singer, 1986; model 24b)

Reporter information

Type Date Name Affiliation Comment
Reporter 07-APR-2000 N. Van Wyck Stevens Exploration Management Corporation

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.