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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Unnamed (south entrance of Crab Bay) MRDS details
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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