Unnamed (near tributary to South Fork of Kuskokwim River)

The Unnamed (near tributary to South Fork of Kuskokwim River) is a arsenic, gold, and tungsten 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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Site Name

Primary: Unnamed (near tributary to South Fork of Kuskokwim River)

Commodity

Primary: Arsenic
Primary: Gold
Primary: Tungsten
Secondary: Antimony
Secondary: Cobalt

Location

State: Alaska
District: McGrath

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: Epithermal vein, Creede

Orebody

Not available

Structure

Not available

Alterations

Alteration Type: L
Alteration Text: Sericite.

Rocks

Not available

Analytical Data

Not available

Materials

Ore: Arsenopyrite
Ore: Pyrite
Ore: Galena
Gangue: Quartz

Comments

Comment (Deposit): Model Name = Creede epithermal vein (?) (Cox and Singer, 1986; model 25b).

Comment (Geology): Geologic Description = This unnamed occurrence is a stockwork of pyrite-galena-quartz that cuts a small granodiorite porphyry intrusion and altered dacitic tuffs. The mineralized zone occurs near the contact between igneous rocks of the Terra Cotta Volcanic Field and Lower Cretaceous Kahiltna flysch (Bundtzen, Harris, and Gilbert, 1997). No precise structural or size measurements of the mineralized zone are available. Grab samples from talus contain up to 4,000 ppm arsenic, 2,100 ppb gold, 66 ppm cobalt, 110 ppm antimony, and 550 ppm tungsten (Bundtzen, Harris, and Gilbert, 1997).

Comment (Reference): Primary Reference = Bundtzen, Harris, and Gilbert, 1997

Comment (Workings): Workings / Exploration = D.N. Solie discovered the mineralized area during geologic mapping for the Alaska Division of Geological and Geophysical Surveys in 1988. Grab samples from the talus contain up to 4,000 ppm arsenic, 2,100 ppb gold, 66 ppm cobalt, 110 ppm antimony, and 550 ppm tungsten (Bundtzen, Harris, and Gilbert, 1997).

Comment (Exploration): Status = Inactive

References

Reference (Deposit): Bundtzen, T.K., Harris, E.E., and Gilbert, W.G., 1997, Geologic Map of the eastern McGrath quadrangle, Alaska: Alaska Division of Geological and Geophysical Surveys Report of Investigations 97-14, 34 pages, one sheet, scale 1:125,000.

Reference (Deposit): Solie, D.N., Bundtzen, T.K., and Gilbert, W.G., 1991, K-Ar ages of igneous rocks in the McGrath quadrangle, Alaska: Alaska Division of Geological and Geophysical Surveys Public Data File Report 160, 17 pages, one sheet, 1:250,000 scale.

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