The Unnamed (on Cascade Inlet) is a lead, copper, 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
Elevation:
Commodity: Lead, Copper, Gold, Silver
Lat, Long: 55.174, -131.37300
Map: View on Google Maps
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Unnamed (on Cascade Inlet) MRDS details
Site Name
Primary: Unnamed (on Cascade Inlet)
Commodity
Primary: Lead
Primary: Copper
Primary: Gold
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: Polymetallic veins
Orebody
Not available
Structure
Not available
Alterations
Alteration Type: L
Alteration Text: Sericitization of trondhjemite country rock.
Rocks
Not available
Analytical Data
Not available
Materials
Ore: Pyrite
Ore: Galena
Ore: Chalcopyrite
Gangue: Quartz
Comments
Comment (Deposit): Model Name = Polymetallic veins (Cox and Singer, 1986; model 22c)
Comment (Geology): Geologic Description = The country rock at this site is Silurian trondhjemite (Berg, 1972 [I 684]; Berg and others, 1988). In this area, the trondhjemite is schistose and sericitized, probably owing to regional greenschist-grade metamorphism in Late Cretaceous time. The occurrence consists of sulfide-bearing quartz fissure veins up to 6 feet thick in sheared, sericitized trondhjemite. Sulfide minerals include galena, and, based on sample analyses, probably chalcopyrite and pyrite. Samples of the sulfide-bearing quartz veins contained up to 14 ppm Au, 5 ppm Ag, 1500 ppm, Cu, and 300 ppm Pb (Karl, 1992, loc. 26).
Comment (Workings): Workings / Exploration = Samples of the sulfide-bearing quartz veins contained up to 14 ppm Au, 5 ppm Ag, 1500 ppm, Cu, and 300 ppm Pb (Karl, 1992, loc. 26).
Comment (Reference): Primary Reference = Karl, 1992
Comment (Geology): Age = Probably Late Cretaceous or younger.
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., 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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