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  3. Mineral Resource Data System (MRDS)

Unnamed (headwaters of Kobuk River)

Occurrence in Alaska, United States with commodities Tin, Arsenic, Beryllium, Bismuth, 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. Alteration
  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 10308334
Record type Site
Current site name Unnamed (headwaters of Kobuk River)

Geographic coordinates

Geographic coordinates: -154.39343, 67.3096 (WGS84)
Relative position This site represents two occurrences in an east-trending mile-long area near the headwaters of the Kobuk River. The map site is at the center of the area, sec. 15, T. 22 N., R. 20 E., of the Kateel River Meridian. Location is accurate to within 2000 ft. The site corresponds to localities 47 and 48 of Grybeck and Nelson (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

Survey Pass B-3(quadrangle 1:63,360 scale)

Survey Pass S(quadrangle 1:100,000 scale)

Survey Pass C(quadrangle 1:250,000 scale)

Hydrologic units (watersheds)

Upper Kobuk River(hydrologic unit)

Kobuk-Selawik Rivers(hydrologic accounting unit)

Northwest(hydrologic subregion)

Alaska(hydrologic region)

Federal lands

Gates of the Arctic National Park(National Park)

National Park NPS(Type of land area)

NPS(Federal land areas administered by NPS)

Geographic areas

Country State
United States Alaska

Commodities

Commodity Importance
Tin Critical Primary
Arsenic Critical Secondary
Beryllium Critical Secondary
Bismuth Critical Secondary
Antimony Critical Secondary

Comments on the commodity information

  • Gangue = Calc-silcates

Alteration

  • (Local) Skarn.

Mineral occurrence model information

Model code 43
USGS model code 14b
Deposit model name Sn skarn

Nearby scientific data

(1) -154.39343, 67.3096
ListMap

Economic information

Comments on the geologic information

  • Geologic Description = The occurrences consist of sparse float of vein or segregation quartz in foliated porphyritic granite of Devonian age (Nelson and Grybeck, 1980) and .of abundant skarn near the contact of the granite with Paleozoic carbonates (Nelson and Grybeck, 1981). Selected samples of float contain 5000 ppm As, 200 ppm Be, 30 to 100 Bi ppm, 200 ppm Sb, and 500 to 1000 ppm Sn. These occurrences are similar to other contact-metamorphic deposits elsewhere in the Brooks Range (Newberry and others, 1986).
  • Age = Devonian; related to the intrusion of the Devonian pluton.

Economic information about the deposit and operations

Development status Occurrence

Comments on exploration

  • Status = Inactive

Mining district

District name Shungnak

Reference information

Bibliographic references

Comments on the references

  • Primary Reference = Grybeck and Nelson, 1981

General comments

Subject category Comment text
Deposit Model Name = Skarn (Cox and Singer, 1986; model 14b)
Deposit Other Comments = Located within Gates of the Arctic National Park.

Reporter information

Type Date Name Affiliation Comment
Reporter 21-SEP-99 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.