Unnamed (on a tributary to Windy Fork)

The Unnamed (on a tributary to Windy Fork) is a silver and zinc 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 (on a tributary to Windy Fork)

Commodity

Primary: Silver
Primary: Zinc
Secondary: Molybdenum

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: Sedimentary exhalative Zn-Pb

Orebody

Not available

Structure

Not available

Alterations

Not available

Rocks

Not available

Analytical Data

Not available

Materials

Ore: Sphalerite
Ore: Pyrite
Ore: Galena

Comments

Comment (Exploration): Status = Inactive

Comment (Geology): Age = Undated, inferred to be Early Silurian, based on stratigraphic evidence.

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

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

Comment (Workings): Workings / Exploration = The reporter first found the occurrence in 1983 (Bundtzen and others, 1988). Grab samples of one sulfide bearing horizon contained 700 ppm zinc, 1.2 grams/tonne silver, and 31 ppm molybdenum.

Comment (Geology): Geologic Description = This unnamed occurrence consists of three thin, stratiform sulfide layers in black shale of the Lower Ordovician to Lower Silurian Post, River Formation a unit of the Dillinger subterrane (Bundtzen, Harris, and Gilbert, 1997). The sulfide beds are isoclinally folded along with host strata and are believed to be syngenetic in origin. The occurrence is just below the contact between the Post River Formation and the mid-Silurian Terra Cotta Mountains Sandstone, and hence has an inferred age of Early Silurian. . Three 6 centimeter thick sulfide layers mainly contain pyrite, with minor to trace disseminated sphalerite and galena (Bundtzen and others, 1988; Bundtzen Harris, and Gilbert, 1997). Grab samples of one sulfide bearing horizon contained 700 ppm zinc, 1.2 grams/tonne silver, and 31 ppm molybdenum.

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 pages, one sheet, scale 1:125,000.

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