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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Fort Hamlin Hills pluton MRDS details
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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