Unnamed (on Shapka Island)

The Unnamed (on Shapka Island) is a antimony 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 Shapka Island)

Commodity

Primary: Antimony
Secondary: Arsenic

Location

State: Alaska
District: Alaska Peninsula

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

Not available

Orebody

Not available

Structure

Not available

Alterations

Alteration Type: L
Alteration Text: Some of the dikes are described as 'altered'.

Rocks

Not available

Analytical Data

Not available

Materials

Gangue: Quartz
Gangue: Calcite

Comments

Comment (Geology): Age = Eocene or younger.

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

Comment (Workings): Workings / Exploration = Rock samples 84ACe113-116, collected by the U.S. Geological Survey in the mid-1980's, were reported to be anomalous in antimony and arsenic (Wilson and others, 1988).

Comment (Geology): Geologic Description = This occurrence is in rocks mapped as Eocene to Oligocene Mashik Formation (Wilson and others, 1995). Potassium-argon dating of hornblende from leuco-basalt gave an age of 43 million years (Wilson and others, 1994). Sandstone and siltstone are cut by felsic and porphyritic hornblende andesite(?) or diorite dikes. Some of the dikes are sulfide-bearing (Wilson and others, 1988). A slightly altered hornblende diorite dike is cut by a shear zone or by fractures filled with carbonate or quartz veins. Rock samples are reported to be anomalous in antimony and arsenic.

Comment (Exploration): Status = Inactive

References

Reference (Deposit): Angeloni, L.M., Wilson, F.H., and Sutlet, S., 1985, Map and tables showing preliminary rock geochemical data, Port Moller, Stepovak Bay, and Simeonof Island quadrangles, Alaska: U.S. Geological Survey Open-File Report 85-470, 179 p., 1 map sheet, scale 1:250,000.

Reference (Deposit): Wilson, F.H., Detterman, R.L., Miller, J. W., and Case, J.E., 1995, Geologic map of the Port Moller, Stepovak Bay, and Simeonof Island quadrangles, Alaska: U.S. Geological Survey Miscellaneous Investigation Series Map I-2272, 1 map sheet, scale 1:250,000.

Reference (Deposit): Wilson, F.H., Shew, N., DuBois, G.D., and Bie, S.W., 1994, Sample locality map and analytical data for potassium-argon ages in the Port Moller, Stepovak Bay and Simeonof Island quadrangles, Alaska Peninsula, Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-2155-E, 18 p., 1 map sheet, scale 1:250,000.

Reference (Deposit): Wilson, F.H., White, W.H., and DuBois, G.D., 1988, Brief descriptions of mines, prospects, and mineral occurrences in the Port Moller and Stepovak Bay quadrangles, Alaska Peninsula: U.S. Geological Survey Open-File Report 88-666, 128 p., scale 1:250,000.

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