Unnamed (southeast of Driest Point)

The Unnamed (southeast of Driest Point) 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 (southeast of Driest Point)

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

Not available

Rocks

Role: Host
Age Type: Host Rock
Age Young: Late Triassic

Analytical Data

Not available

Materials

Ore: Barite
Ore: Galena
Ore: Pyrite
Ore: Sphalerite
Gangue: Calcite
Gangue: Hematite
Gangue: Quartz

Comments

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

Comment (Geology): Geologic Description = The country rocks in the area of this site are recrystallized, Upper Triassic carbonate and clastic rocks, rhyolite, and basalt (Berg, 1972). The rocks are folded and faulted, and intruded by rhyolite dikes. All were regionally metamorphosed to greenschist-grade phyllite and semischist in Late Cretaceous time.? the mineral occurrences consist of quartz-calcite-barite(-hematite) veins up to 6 feet thick that contain galena and sphalerite, and extend at least 60 feet inland from tidewater (Karl, 1992, loc. 23). The veins are hosted by dolomitic conglomerate and brecciated rhyolite. Rhyolite dikes up to 60 feet thick cut the conglomerate and also intrude the veins. Samples of variously mineralized veins and bedded rocks contained up to 20 ppm Ag, more than 2% Pb, 1500 ppm Zn; and more than 5000 ppm Ba (Karl, 1992, loc. 23a-e).

Comment (Geology): Age = Host rock is Late Triassic.

Comment (Reference): Primary Reference = Karl, 1992

Comment (Geology): Age = Veins hosted by Upper Triassic strata and cut by a rhyolite dike may be Late Triassic in age; veins that postdate the dike may be Late Cretaceous or younger.

Comment (Workings): Workings / Exploration = Samples of variously mineralized veins and bedded rocks contained up to 20 ppm Ag, more than 2% Pb, 1500 ppm Zn; and more than 5000 ppm Ba (Karl, 1992, loc. 23a-e).

References

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,

Reference (Deposit): Elliott, R.L., Berg, H.C., and Karl, Susan, 1978, map and table describing metalliferous and selected nonmetalliferous mineral deposits, Ketchikan and Prince Rupert quadrangles, Alaska: U.S. Geological Survey Open-file Report, 78-73-B,17 p., scale 1:250,000.

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.

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