Unnamed (Crab Bay area)

The Unnamed (Crab Bay area) is a zinc, lead, barium-barite, 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 (Crab Bay area)

Commodity

Primary: Zinc
Primary: Lead
Primary: Barium-Barite
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: Dolomitization of limestone country rock.

Rocks

Not available

Analytical Data

Not available

Materials

Ore: Sphalerite
Ore: Galena
Ore: Barite
Gangue: Quartz

Comments

Comment (Workings): Workings / Exploration = At a locality informally called 'Cave Creek,' exploration in the 1970s by private interests showed galena and sphalerite in quartz veins up to 3 feet thick, as well as disseminated galena and sphalerite, in a 75-foot-wide zone in dolomite. Their exploration reportedly also showed two other occurrences of sulfide-bearing quartz veins at the dolomite-rhyolite contact. A sample of a quartz vein contained 5000 ppm Ba (Karl, 1992, loc. 32a-d).

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

Comment (Geology): Geologic Description = The country rocks in the area of the site are recrystallized, locally phyllitic, rhyolite, and massive, dolomitic limestone that conformably overlies the rhyolite (Berg, 1972 [I 684]; Berg and others, 1988). These Upper Triassic rocks were regionally metamorphosed to greenschist grade in Late Cretaceous time. The occurrences are quartz fissure veins in dolomite and at a dolomite-rhyolite contact (Karl, 1992a-d). The veins, which contain barite, galena, and sphalerite, have the character of ladder veins, and are most abundant at the dolomite-rhyolite contact. . At a locality informally called 'Cave Creek,' exploration in the 1970s by private interests showed galena and sphalerite in quartz veins up to 3 feet thick, as well as disseminated galena and sphalerite, in a 75-foot-wide zone in dolomite. Their exploration reportedly also showed two other occurrences of sulfide-bearing quartz veins at the dolomite-rhyolite contact. A sample of a quartz vein contained 5000 ppm Ba (Karl, 1992, loc. 32a-d).

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., 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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