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  3. Mineral Resource Data System (MRDS)

Cobre

Prospect in Alaska, United States with commodities Copper, Lead, 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. 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 10003303
MRDS ID A106046
Record type Site
Current site name Cobre

Geographic coordinates

Geographic coordinates: -157.20351, 67.37954 (WGS84)
Relative position Located on ridge west of Kalurivik Creek near Peak 3430 in sec. 24, T. 23 N., R. 8 E., Kateel River Meridian. Location is accurate to within 1000 ft. (300 m).

Site location context

Political divisions (FIPS codes)

Northwest Arctic(Borough)

Alaska(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Ambler River B-3(quadrangle 1:63,360 scale)

Ambler River SE(quadrangle 1:100,000 scale)

Ambler River C(quadrangle 1:250,000 scale)

Hydrologic units (watersheds)

Middle Kobuk River(hydrologic unit)

Kobuk-Selawik Rivers(hydrologic accounting unit)

Northwest(hydrologic subregion)

Alaska(hydrologic region)

Geographic areas

Country State
United States Alaska

Commodities

Commodity Importance
Copper Primary
Lead Primary
Zinc Critical Primary
Silver Secondary
Cobalt Critical Secondary

Materials information

Materials Type of material
Chalcopyrite Ore

Mineral occurrence model information

Model code 184
USGS model code 28a
Deposit model name Massive sulfide, kuroko
Mark3 model number 93

Nearby scientific data

(1) -157.20351, 67.37954
ListMap

Economic information

Comments on the geologic information

  • Geologic Description = Bedding-controlled disseminated chalcopyrite deposit up to 6 ft (3 m) thick in metaquartzite, quartz-mica schist, quartz-chlorite schist, and locally marble. The copper-bearing beds are estimated to lie 4000 m stratigraphically below the Smucker rhyolite (Devonian). The host rocks could therefore be early Paleozoic or late PreCambrian. The copper-bearing rocks are interlayered with marbles and lie about 60 m stratigraphically above a stromatolite-bearing horizon. Other stromatolites are found along the ridge 7800 ft (2600 m) to the north, in a faulted syncline.
  • Age = Early Paleozoic

Economic information about the deposit and operations

Development status Prospect
Commodity type Metallic

Comments on exploration

  • Status = Inactive

Mining district

District name Kiana

Comments on the workings information

  • Workings / Exploration = Geologic mapping and some geochemical sampling. Claims staked in 1979 by Anaconda. One six foot (2 m) chip sample ran 0.34% Cu, 10 ppm Pb, 9 ppm Zn, 9 ppm Co. Two float samples ran 0.7% and 0.8 % Cu, 40 and 29 ppm Pb, 18 and 14 ppm Zn, and 3 and 2 ppm Co. A sample from a vein in marble ran 4700 ppm Pb, 760 ppm Zn, 4.9 ppm Ag (unpublished Anaconda notes).

Reference information

Bibliographic references

  • Deposit

    UNPUBLISHED ANACONDA NOTES FROM 1979

  • Deposit

    Unpublished Anaconda notes from 1979.

Comments on the references

  • Primary Reference = Unpublished Anaconda notes from 1979.

General comments

Subject category Comment text
Deposit Model Name = Kuroko ?
Deposit Other Comments = Discovered by Anaconda geologist in 1979.

Reporter information

Type Date Name Affiliation Comment
Reporter 12-MAY-1997 S.W. Nelson U.S. Geological Survey

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.