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Unnamed (near headwaters of Takahula River)

Occurrence in Alaska, United States with commodities Fluorine-Fluorite, Tin, Zinc, Arsenic, Beryllium, Bismuth, Tin
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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 10001205
MRDS ID A011918
Record type Site
Current site name Unnamed (near headwaters of Takahula River)

Geographic coordinates

Geographic coordinates: -153.99342, 67.31961 (WGS84)
Relative position This site is at an elevation of about 3500 feet near the headwaters of the Takahula River. It is in the N1/2 of sec. 9, T. 22 N., R. 22 E., of the Kateel River Meridian. The location is accurate to within 2000ft. The site corresponds to locality 52 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)

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
Fluorine-Fluorite Critical Primary
Tin Critical Primary
Zinc Critical Primary
Arsenic Critical Secondary
Beryllium Critical Secondary
Bismuth Critical Secondary
Tin Critical Secondary

Comments on the commodity information

  • Gangue = Calc-silicate minerals

Materials information

Materials Type of material
Fluorite Ore
Sphalerite Ore

Alteration

  • (Local) Contact metamorphic.

Mineral occurrence model information

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

Host and associated rocks

  • Host or associated Associated
    Rock type Plutonic Rock > Granitoid > Granite
    Rock unit name Arrigetch Peaks Pluton; Gneissic Granite
    Rock description Arrigetch Peaks Pluton; Gneissic Granite
    Stratigraphic age (youngest) Late Devonian
    Stratigraphic age (youngest) Late Devonian
  • Host or associated Host
    Rock type Metamorphic Rock > Skarn (Tactite)

Nearby scientific data

(1) -153.99342, 67.31961
ListMap

Economic information

Comments on the geologic information

  • Geologic Description = This occurrence consists of a skarn deposit in an approximately 1000 x 500 ft. area at the contact of Devonian granite with Paleozoic calcareous rocks (Nelson and Grybeck, 1980). Epidote-garnet, magnetite-quartz-hornblende, and magnetite-hornblende skarns contain erratically distributed sphalerite and fluorite. Analyses of numerous grab samples show as much as 7000 ppm As, and most show 700 to 1000 ppm Be, 100 to 200 ppm Bi, and 500 to 1000 ppm Zn. Sn values range from 500 to more than 1000 ppm Sn, but petrographic examination indicates that the Sn is not present as an oxide or sulfide. This occurrence is one of many skarn deposits adjacent to the Devonian granite and is similar to others elsewhere 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
Commodity type Both

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-1999 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.