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  3. Mineral Resource Data System (MRDS)

Unnamed (in headwaters of Wood River)

Occurrence in Alaska, United States with commodity 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. Mineral occurrence model information
  8. Host and associated rocks
  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 10000724
MRDS ID A011363
Record type Site
Current site name Unnamed (in headwaters of Wood River)

Geographic coordinates

Geographic coordinates: -147.66088, 63.68574 (WGS84)
Relative position This occurrence is at an elevation of about 6,500 feet on the west wall of a hanging-valley glacier above the southwest head of Wood River. The map site is approximately 0.5 mile southeast of peak 8,115, at the center of sec. 24, T. 14 S., R. 1 W., of the Fairbanks Meridian. The location is accurate to within 2,000 feet. This is location 22 of Sherwood and others (1976).

Site location context

Political divisions (FIPS codes)

Denali(Borough)

Alaska(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Healy C-2(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
Copper Primary

Materials information

Materials Type of material
Chalcopyrite Ore

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) -147.66088, 63.68574
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 of 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 disseminations in the gabbroic sills and dikes. A sample contained 750 ppm copper and 2.4 ppm silver (Sherwood and others, 1976).
  • Age = Gabbroic 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 exploration only. A sample contained 750 ppm copper and 2.4 ppm silver (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)
Deposit Other Comments = One of several minor copper showings in this belt of rocks.

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.