Unnamed (southwest shore of Mitrofania Island)

The Unnamed (southwest shore of Mitrofania Island) is a lead, zinc, gold, 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 (southwest shore of Mitrofania Island)

Commodity

Primary: Lead
Primary: Zinc
Primary: Gold
Primary: Silver
Secondary: Arsenic
Secondary: Antimony

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

Model Name: Polymetallic veins

Orebody

Not available

Structure

Not available

Alterations

Not available

Rocks

Not available

Analytical Data

Not available

Materials

Ore: Pyrite
Gangue: Quartz
Gangue: Calcite

Comments

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

Comment (Workings): Workings / Exploration = Rock samples 84AGe17-20 and 83AWs 63 collected by the U.S. Geological Survey in the mid-1980's, were reported to be anomalous in silver, gold, lead, zinc, antimony, and arsenic (Angeloni and others, 1985; Wilson and others, 1988).

Comment (Geology): Geologic Description = This occurrence is in an area mapped as undivided Tertiary volcanic rocks (Wilson and others, 1995). Small plutons Miocene or Pliocene granodiorite to quartz diorite crop out a few miles to the north and south of the occurrence (Wilson and others, 1995). At this location altered andesite(?) flows are cut by numerous quartz-calcite veins as much as 6 inches thick (Wilson and others, 1988). Some of the veins are braided and contain pyrite and probably others sulfides. Rock samples collected by the U.S. Geological Survey were reported to be anomalous in silver, gold, lead, zinc, antimony, and arsenic (Angeloni and others, 1985; Wilson and others, 1988).

Comment (Geology): Age = Tertiary.

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

Comment (Deposit): Other Comments = This site is located on land selected by the Bristol Bay Native Corporation.

Comment (Exploration): Status = Inactive

References

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.

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): Arbogast, B.F., Bailey, E.A., and Frisken, J.G., 1987, Analytical results and sample locality maps of stream sediment, heavy-mineral-concentrate, and rock samples from the Port Moller, Stepovak Bay, and Simeonof island quadrangles, Alaska: U.S. Geological Survey Open-File Report 87-502, 122 p., 2 sheets, 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.

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