Unnamed (on Cascade Inlet)

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

Satelite View

MRDS mine locations are often very general, and in some cases are incorrect. Some mine remains have been covered or removed by modern industrial activity or by development of things like housing. The satellite view offers a quick glimpse as to whether the MRDS location corresponds to visible mine remains.

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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