Unnamed (east of headwaters of Windy Fork)

The Unnamed (east of headwaters of Windy Fork) is a zinc 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 (east of headwaters of Windy Fork)

Commodity

Primary: Zinc
Primary: Silver
Secondary: Copper
Secondary: Lead

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: Bedded barite

Orebody

Not available

Structure

Not available

Alterations

Alteration Type: L
Alteration Text: None.

Rocks

Not available

Analytical Data

Not available

Materials

Ore: Pyrite

Comments

Comment (Reference): Primary Reference = Bundtzen and others, 1988

Comment (Workings): Workings / Exploration = The reporter and Kristi McDonald sampled the mineralized zone in 1982. Two random grab samples from the mineralized shale yielded up to 0.86 percent zinc, 4.5 grams/tonne silver, 104 ppm copper, and 186 ppm lead (Bundtzen and others, 1988).

Comment (Exploration): Status = Inactive

Comment (Geology): Age = Inferred to be Lower Ordovician to Lower Silurian (Bundtzen, Harris, and Gilbert, 1997), assuming it is a syngenetic deposit.

Comment (Deposit): Model Name = Sedimentary exhalitive lead-zinc (Cox and Singer, 1986; model 31b).

Comment (Deposit): Other Comments = See other examples of shale-hosted mineralization in McGrath quadrangle (MG029, MG049, MG051, MG064, MG071).

Comment (Geology): Geologic Description = The unnamed occurrence consists of shale-hosted Zn-Ag (Pb-Cu) mineralization in the Lower Ordovician to Lower Silurian Post River Formation, a unit of the Dillinger subterrane (Bundtzen, Harris, and Gilbert, 1997). The mineralized zone is parallel to bedding and is a distinctly sulfur-stained, carbonaceous shale bed about one meter thick. Only disseminated pyrite was identified in the zone. Although isotopic data is lacking, Bundtzen, Harris, and Gilbert (1997) regarded the occurrence as possible sedimentary exhalitive (?) lead-zinc mineralization. Two random grab samples from the mineralized shale contained up to 0.86 percent zinc, 4.5 grams/tonne silver, 104 ppm copper, and 186 ppm lead (Bundtzen and others, 1988).

References

Reference (Deposit): Bundtzen, T.K., Kline, J.T., Smith, T.E., and Albanese, M.D., 1988, Geology of the McGrath A-2 quadrangle, Alaska: Alaska Division of Geological and Geophysical Surveys Professional Report 91, 18 p., 1sheet, scale 1:63,360.

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 p., 1 sheet, scale 1:125,000.

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