Unnamed (near Point St. Albans)

The Unnamed (near Point St. Albans) is a silver, lead, 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 (near Point St. Albans)

Commodity

Primary: Silver
Primary: Lead
Primary: Zinc
Secondary: Antimony

Location

State: Alaska
District: Kupreanof

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: None or minor.

Rocks

Not available

Analytical Data

Not available

Materials

Ore: Berthierite
Ore: Arsenopyrite
Ore: Galena
Ore: Pyrite
Ore: Sphalerite
Gangue: Quartz

Comments

Comment (Reference): Primary Reference = Grybeck, Berg, and Karl, 1984

Comment (Reserve-Resource): Reserves = None

Comment (Workings): Workings / Exploration = First noted by Houston and others (1958, p. 24) in their work on the uranium resources of Alaska; they provide little information about the veins other than they contain less than 0.0001 equivalent uranium and sphalerite. A claim had been staked on the deposits in 1954 but apparently it has not been active since (U.S. Bureau of Mines, 1980) the description of this site is largely based on field work in the early 1980's during a mineral resource assessment of the Petersburg quadrangle (Grybeck, Karl, and Berg, 1984).

Comment (Production): Production Notes = None

Comment (Geology): Geologic Description = Several quartz-calcite veins and lenses up to 6 feet thick and up to a hundred feet long, exposed in rocks exposed in the intertidal zone, contain abundant sphalerite, galena, pyrite, arsenopyrite, and berthierite (FeSb2S4) (Grybeck, Berg, and Karl, 1984). The veins cut the periphery of a Cretaceous hornblende diorite pluton, which intrudes turbidite of the Silurian Bay of Pillars Formation (Brew, and others, 1984). Selected samples of the veins contain up to 0.5 ppm Au, 300 ppm Ag, 360 ppm Cu, and about 2% Pb and 14% Zn.

Comment (Geology): Age = Veins cut Cretaceous hornblende diorite.

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

References

Reference (Deposit): Brew, D. A., Ovenshine, A. T., Karl, S. M., and Hunt, S. J., 1984, Preliminary reconnaissance geologic map of the Petersburg and parts of the Port Alexander and Sumdum 1:250,000 quadrangles, southeastern Alaska: U.S. Geological Survey Open-File Report 84-405, 43 p., 2 sheets, scale 1:250,000.

Reference (Deposit): Cobb, E.H., 1972, Metallic mineral resources map of the Petersburg quadrangle, Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-415, 1 sheet, scale 1:250,000.

Reference (Deposit): Houston, J.R., Bates, R.G., Velikanje, R.S., and Wedow, Helmuth, Jr., 1958, Reconnaissance for radioactive deposits in southeastern Alaska, 1952: U.S. Geological Survey Bulletin 1058-A, p. 1-31.

Reference (Deposit): Cobb, E.H., 1978, Summary of references to mineral occurrences (other than mineral fuels and construction materials) in the Petersburg quadrangle, Alaska: U.S. Geological Survey Open-File Report 78-870, 53 p.

Reference (Deposit): Grybeck, D.J., Berg, H.C., and Karl, S.M., 1984, Map and description of the mineral deposits in the Petersburg and eastern Port Alexander quadrangles: U.S. Geological Survey Open-File Report 84-837, 86 p., 1 sheet, scale 1:250,000.

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