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Fort Hamlin Hills pluton

Occurrence in Alaska, United States with commodities Rubidium, Tin, Tantalum, Tungsten
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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 10307305
Record type Site
Current site name Fort Hamlin Hills pluton

Geographic coordinates

Geographic coordinates: -149.92314, 66.00965 (WGS84)
Relative position The occurrence is located about 24 miles west of Stevens Village along a high (approximately 2500-foot level) ridge in the Fort Hamlin Hills (sec. 29, T. 14 N., R. 11 W., of the Fairbanks Meridian). Location is accurate within a 1-mile radius.

Site location context

Political divisions (FIPS codes)

Yukon-Koyukuk(Census area)

Alaska(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Beaver A-6(quadrangle 1:63,360 scale)

Beaver S(quadrangle 1:100,000 scale)

Beaver(quadrangle 1:250,000 scale)

Hydrologic units (watersheds)

Alaska(hydrologic region)

Federal lands

BLM(Federal land areas administered by BLM)

Geographic areas

Country State
United States Alaska

Commodities

Commodity Importance
Rubidium Critical Primary
Tin Critical Primary
Tantalum Critical Secondary
Tungsten Critical Secondary

Materials information

Materials Type of material
Pyrite Ore
Hematite Gangue
Tourmaline Gangue

Alteration

  • (Local) Secondary chlorite, sericite, tourmaline, hematite and pyrite.

Mineral occurrence model information

Model code 47
USGS model code 15b
Deposit model name Sn veins

Host and associated rocks

  • Host or associated Associated
    Rock type
    Rock unit name Fort Hamlin Hills
    Stratigraphic age (youngest) Cretaceous
    Chronological age 109

Nearby scientific data

(1) JDoc
ListMap

Economic information

Comments on the geologic information

  • Geologic Description = This occurrence consists of a sample from a 5- to 8-ft.-wide tourmaline- and pyrite-bearing altered leucocratic, felsic dike which cuts biotite granite (Barker and Foley, 1986). The dike is variably stained brick-red and green and exposed for 50 feet along a north-trending strike. Alteration extends several feet into the granite, and secondary minerals in the dike and host granite include minor chlorite, sericite, tourmaline, hematite, and pyrite.
  • Age = the host dike cuts (and is probably related to) a biotite granite of the Fort Hamlin Hills pluton. The Fort Hamlin Hills pluton has not been dated, but its age is likely Cretaceous, based on ages of several compositionally similar plutons in the area which have ages ranging from 106 to 112 Ma (Barker, 1991).
  • Age = Chronological age is for compositionally similar plutons in the area.

Economic information about the deposit and operations

Development status Occurrence

Comments on exploration

  • Status = Inactive

Mining district

District name Yukon Flats

Reference information

Bibliographic references

  • Deposit

    Barker, J.C., and Foley, J.Y., 1986, Tin reconnaissance of the Kanuti and Hodzana Rivers uplands, central Alaska: U.S. Bureau of Mines Information Circular 9104, 27 p.

Comments on the references

  • Primary Reference = Barker and Foley, 1986

General comments

Subject category Comment text
Deposit Model Name = Sn veins(?) (Cox and Singer, 1986; model 15b)
Deposit Other Comments = Occurrence consists of a single strongly anomalous sample. Sample number 181 (Barker and Foley, 1986) contained 308 ppm Sn, 1,102 ppm Rb, 29 ppm Ta, and 16 ppm W.

Reporter information

Type Date Name Affiliation Comment
Reporter 17-NOV-99 J. M. Britton 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.