Unnamed (western Mitrofania Island)

The Unnamed (western Mitrofania Island) is a zinc, gold, lead, 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 (western Mitrofania Island)

Commodity

Primary: Zinc
Primary: Gold
Primary: Lead
Primary: Silver
Secondary: Copper
Secondary: Bismuth
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

Alteration Type: L
Alteration Text: Silicification.

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 84AGe10-16 collected by the U.S. Geological Survey in the mid-1980's, contained 10 ppm or less gold, and as much as 500 ppm antimony, 26,000 ppm arsenic, 1,500 ppm copper, 300 ppm lead, 50 ppm silver, and greater than 10,000 ppm zinc (Angeloni and others, 1985; Wilson and others, 1988). Bismuth is also reported in some of the analyses.

Comment (Geology): Ore Material = unidentified sulfides

Comment (Geology): Age = Tertiary.

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

Comment (Geology): Geologic Description = This occurrence is in an area mapped as undivided Tertiary volcanic rocks (Wilson and others, 1995). Small plutons of 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 site, fractured and silicified volcanic flows are cut by numerous quartz-calcite veinlets as much as 2 inches thick, which fill the fracture zones (Wilson and others, 1988). Some veinlets carry as much as 80 to 90 percent pyrite and other, unidentified, sulfides. Rock samples collected by the U.S. Geological Survey contained 10 ppm or less gold, and as much as 500 ppm antimony, 26,000 ppm arsenic, 1,500 ppm copper, 300 ppm lead, 50 ppm silver, and 10,000 ppm or more zinc (Angeloni and others, 1985; Wilson and others, 1988). Bismuth is also reported in some of the analyses.

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

Comment (Exploration): Status = Inactive

References

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.

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.

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