Fort Hamlin Hills pluton

The Fort Hamlin Hills pluton is a rubidium and tin mine located in Alaska.

About the MRDS Data:

All mine locations were obtained from the USGS Mineral Resources Data System. The locations and other information in this database have not been verified for accuracy. It should be assumed that all mines are on private property.

Mine Info

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MRDS mine locations are often very general, and in some cases are incorrect. Some mine remains have been covered or removed by modern industrial activity or by development of things like housing. The satellite view offers a quick glimpse as to whether the MRDS location corresponds to visible mine remains.

Site Name

Primary: Fort Hamlin Hills pluton

Commodity

Primary: Rubidium
Primary: Tin
Secondary: Tantalum
Secondary: Tungsten

Location

State: Alaska
District: Yukon Flats

Land Status

Not available

Holdings

Not available

Workings

Not available

Ownership

Not available

Production

Not available

Deposit

Record Type: Site
Operation Category: Occurrence
Operation Type: Unknown
Years of Production:
Organization:
Significant:

Physiography

Not available

Mineral Deposit Model

Model Name: Sn veins

Orebody

Not available

Structure

Not available

Alterations

Alteration Type: L
Alteration Text: Secondary chlorite, sericite, tourmaline, hematite and pyrite.

Rocks

Role: Associated
Age Type: Associated Rock
Age in Years: 109.000000+-3.000000
Age Young: Cretaceous

Analytical Data

Not available

Materials

Ore: Pyrite
Gangue: Tourmaline
Gangue: Hematite

Comments

Comment (Reference): Primary Reference = Barker and Foley, 1986

Comment (Deposit): Model Name = Sn veins(?) (Cox and Singer, 1986; model 15b)

Comment (Exploration): Status = Inactive

Comment (Geology): 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).

Comment (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.

Comment (Geology): 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.

Comment (Geology): Age = Chronological age is for compositionally similar plutons in the area.

References

Reference (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.

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