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  3. Mineral Resource Data System (MRDS)

Unnamed (northwest of Takahula River)

Occurrence in Alaska, United States with commodities Tin, Zinc, Beryllium, Bismuth, Molybdenum
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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 10308335
Record type Site
Current site name Unnamed (northwest of Takahula River)

Geographic coordinates

Geographic coordinates: -153.99343, 67.35961 (WGS84)
Relative position The site represents two occurrences in a northeast-trending, two-mile-long area, about 2.5 miles northwest of the Takakula River. The approximate center of the area is in the NW1/4 of sec. 33, T. 23 N., R. 22 E., of the Kateel River Meridian. The location is accurate to within 2000 ft. The site corresponds to localities 50 and 51 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-2(quadrangle 1:63,360 scale)

Wiseman SW(quadrangle 1:100,000 scale)

Survey Pass(quadrangle 1:250,000 scale)

Hydrologic units (watersheds)

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
Zinc Critical Primary
Beryllium Critical Secondary
Bismuth Critical Secondary
Molybdenum Secondary

Alteration

  • (Local) Contact metamorphic.

Mineral occurrence model information

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

Nearby scientific data

(1) -153.99343, 67.35961
ListMap

Economic information

Comments on the geologic information

  • Geologic Description = Both occurrences are in or adjacent to Devonian granite near the contact with Paleozoic rocks (Nelson and Grybeck, 1980). The occurrences consist of a grab sample of black phyllite about 100 m from altered granite and several samples of marble, calc-silicate rocks, and gneissic granite. Selected samples contain 200 ppm Be, 30 and 50 ppm Bi, 20 ppm Mo, 100 and 5000 ppm Sn, and 700 ppm Zn. The occurrences are similar to other skarn deposits in the Brooks Range (Newberry and others, 1986).
  • Age = Devonian; related to the intrusion of Devonian pluton.

Economic information about the deposit and operations

Development status Occurrence

Comments on exploration

  • Status = Inactive

Mining district

District name Koyukuk

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.