Unnamed

The Unnamed is a 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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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

Commodity

Primary: 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: Sedimentary exhalative Zn-Pb

Orebody

Not available

Structure

Not available

Alterations

Not available

Rocks

Not available

Analytical Data

Not available

Materials

Ore: Pyrite
Ore: Sphalerite

Comments

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

Comment (Workings): Workings / Exploration = Kristi McDonald of the Alaska Division of Geological and Geophysical Surveys found and sampled the occurrence in 1982 while measuring section in the Lower Paleozoic black shales of the Post River Formation (Churkin and Carter, 1996). Two chip samples taken across 3 meters of the sulfide-bearing shale exposure averaged 395 ppm zinc (Bundtzen and others, 1988).

Comment (Deposit): Other Comments = See unnamed stratiform occurrence at site MG071.

Comment (Geology): Geologic Description = This occurrence is a stratiform sulfide zone in the Lower Ordovician to Lower Silurian Post River Formation, a unit of the Dillinger subterrane (Bundtzen, Harris, and Gilbert, 1997). The sulfide bearing zone is estimated to be about 1.5 meters thick and consists of several thin pyritiferous layers with traces of sphalerite observed (Bundtzen and others, 1988). Two chip samples taken across 3 meters of the sulfide-bearing shale averaged 395 ppm zinc.

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

Comment (Geology): Age = Inferred to be Late Ordovician to Early Silurian.

Comment (Exploration): Status = Inactive

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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