Unnamed (south entrance of Crab Bay)

The Unnamed (south entrance of Crab Bay) is a 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 (south entrance of Crab Bay)

Commodity

Primary: Lead
Primary: Silver

Location

State: Alaska
District: Ketchikan

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: Low-sulfide Au-quartz vein

Orebody

Not available

Structure

Not available

Alterations

Not available

Rocks

Not available

Analytical Data

Not available

Materials

Ore: Pyrite
Ore: Galena
Gangue: Quartz

Comments

Comment (Workings): Workings / Exploration = A sample of one of the veins contained 0.05 ppm Au, 15 ppm Ag, and 700 ppm Pb (Karl, 1992, loc. 34).

Comment (Deposit): Model Name = Low-sulfide Au-quartz veins (Cox and Singer, 1986; model 36a)

Comment (Geology): Geologic Description = The country rocks at this site are Upper Jurassic or Cretaceous flyschlike metasedimentary rocks and andesitic or basaltic metavolcanic rocks, which are in thrust contact with underlying recrystallized Upper Triassic limestone (Berg, 1972 [I 684], Berg and others, 1988). The rocks were regionally metamorphosed to greenschist-grade phyllite and semischist in Late Cretaceous time. The occurrence consists of abundant quartz veins in the thrust zone, which is marked by as much as two feet of gouge. The veins contain pyrite and galena. A sample of one of the veins contained 0.05 ppm Au, 15 ppm Ag, and 700 ppm Pb (Karl, 1992, loc. 34).

Comment (Geology): Age = Probably Late Cretaceous or younger.

Comment (Reference): Primary Reference = Karl, 1992

References

Reference (Deposit): Karl, S.M., 1992, Map and table of mineral deposits on Annette Island, Alaska: U.S. Geological Survey Open-File Report 92-690, 57 p., 1 map, scale 1:63,360.

Reference (Deposit): Berg, H.C., Elliott, R.L., and Koch, R.D., 1988, Geologic map of the Ketchikan and Prince Rupert quadrangles, southeastern Alaska: U.S. Geological Survey Mineral Investigations Series Map MF-1807,27 p., scale 1:250,000.

Reference (Deposit): Berg, H.C., 1972, Geologic map of Annette Island, Alaska: U.S. Geological Survey Miscellaneous Geologic Investigations Map I-684, 8 p., 1 sheet, scale 1:63,360,

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