Unnamed (west of Aniak River)

The Unnamed (west of Aniak River) is a zinc, antimony, lead, mercury, copper, and silver 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 (west of Aniak River)

Commodity

Primary: Zinc
Primary: Antimony
Primary: Lead
Primary: Mercury
Primary: Copper
Primary: Silver
Secondary: Gold

Location

State: Alaska
District: Aniak

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: Polymetallic veins

Orebody

Not available

Structure

Not available

Alterations

Alteration Type: L
Alteration Text: Quartz and tourmaline replacement, oxidation.

Rocks

Not available

Analytical Data

Not available

Materials

Gangue: Tourmaline
Gangue: Quartz

Comments

Comment (Workings): Workings / Exploration = Reconnaissance surface observation and geochemical sampling has occurred at this site.

Comment (Deposit): Model Name = Polymetallic veins (Cox and Singer, 1986; model 22c).

Comment (Geology): Geologic Description = Quartz and tourmaline variably replace plagioclase porphyry at this occurrence (Frost, 1990, p. C4). Incipient alteration includes tourmaline replacement of plagioclase phenocrysts and quartz replacement of groundmass. More-extensively altered rocks are granular aggregates of fine-grained quartz and clumps of tourmaline. Some rocks are made up of alternating quartz-rich and tourmaline-rich layers. The altered rocks weather as bright red, vegetation-free areas. Rock samples contain up to 70 ppm Ag, 2,000 ppm As, greater than 2,000 ppm B, 500 ppm Cu, 7,000 ppm Pb, 7,000 ppm Sb, 1,000 ppm Zn, and 4.4 ppm Hg (Frost, 1990; Frost and others, 1992). Gold was detected at 0.10 ppm in one sample. The occurrence is at least 100 meters above the base of the Kipchuk volcanic field, a large area of Upper Cretaceous andesite, basalt, tuff, and local rhyolite in the uplands between the Kipchuk and Aniak River drainages (Box and others, 1993).

Comment (Geology): Age = Post-Late Cretaceous. Quartz and tourmaline replace volcanic rocks of the Kipchuk volcanic field that locally yield 69 to 71 Ma K/Ar ages (Box and others, 1993).

Comment (Reference): Primary Reference = Frost, 1990

Comment (Exploration): Status = Inactive

References

Reference (Deposit): Box, S.E, Moll-Stalcup, E.J., Frost, T.P., and Murphy, J.M., 1993, Preliminary geologic map of the Bethel and southern Russian Mission quadrangles, southwestern Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-2226-A, 20 p., scale 1:250,000.

Reference (Deposit): Frost, T.P., Bradley, L., O'Leary, R.M., and Motooka, J., 1992, Geochemical results and sample locality map for rock samples from the Bethel and southern part of the Russian Mission 1:250,000 quadrangles, Alaska: U.S. Geological Survey Open-File Report 92-316, 229 p.

Reference (Deposit): Frost, T.P., 1990, Geology and geochemistry of mineralization in the Bethel quadrangle, southwestern Alaska, in Goldfarb, R. J., Nash, J. T., and Stoeser, J. W., eds., Geochemical studies in Alaska by the U.S. Geological Survey, 1989: U.S. Geological Survey Bulletin 1950, p. C1-C9.

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