Unnamed (at head of tributary to Post River)

The Unnamed (at head of tributary to Post River) is a arsenic and lead 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: Unnamed (at head of tributary to Post River)

Commodity

Primary: Arsenic
Primary: Lead
Secondary: Zinc

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: Polymetallic veins

Orebody

Not available

Structure

Not available

Alterations

Alteration Type: L
Alteration Text: Strong ferricrete alteration.

Rocks

Role: Host
Age Type: Host Rock
Age in Years: 37.500000+-
Age Young: Early Eocene

Analytical Data

Not available

Materials

Ore: Pyrite
Ore: Galena
Gangue: Quartz

Comments

Comment (Exploration): Status = Inactive

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

Comment (Geology): Age = Chronological age is for Host Rock.

Comment (Geology): Age = Mineralization undated; host pluton is 37.5 Ma (Solie and others, 1991).

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

Comment (Geology): Geologic Description = This unnamed occurrence consists of a series of N70W, steeply dipping joints and fractures filled with quartz, pyrite, and euhedral galena grains. Width and strike length of the mineralized area was not determined. Host rock is a medium-grained, phaneritic variant of the Hartman pluton (Bundtzen, Harris, and Gilbert, 1997), which has been dated by K-Ar methods as 37.9 Ma (Solie and others, 1991). A strong ferricrete gossan is associated with the sulfide-bearing stockwork veins. One chip sample of of mineralized stockwork veins contained 500 ppm arsenic, 20 ppb gold, and 340 ppm zinc (Bundtzen, Harris, and Gilbert, 1997). Lead was not analyzed.

Comment (Workings): Workings / Exploration = The reporter visited the site in 1988. One chip sample of mineralized stockwork veins contained 500 ppm arsenic, 20 ppb gold, and 340 ppm zinc. Lead was not analyzed (Bundtzen, Harris, and Gilbert, 1997).

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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