Unnamed (near Driest Point)

The Unnamed (near Driest Point) is a zinc, 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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Site Name

Primary: Unnamed (near Driest Point)

Commodity

Primary: Zinc
Primary: Lead
Primary: Silver
Secondary: Barium-Barite

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

Name: Rhyolite
Role: Associated
Age Type: Associated Rock
Age Young: Late Permian

Analytical Data

Not available

Materials

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

Comments

Comment (Geology): Age = The fissure veins are probably Late Cretaceous or younger in age, assuming that they formed during, or following, the regional metamorphism.

Comment (Geology): Geologic Description = The country rocks at this site consist of sheared, recrystallized, Upper Triassic carbonate and clastic rocks, rhyolite, and basalt; and of diorite dikes that intrude the Triassic strata (Berg, 1972). The rocks were regionally metamorphosed to greenschist-grade phyllite and semischist in Late Cretaceous time. ? the mineral occurrences are quartz-calcite-barite-galena fissure veins up to 6 feet thick in sheared, rhyolite-clast conglomerate Berg, 1992; Karl, 1992). Quartz-calcite veins also cut pyritic diorite dikes that intrude the bedded rocks. Samples of variously mineralized bedded rocks contained up to 1.5 ppm Ag, 150 ppm Pb, 200 ppm Zn, and 5000 ppm Ba; a sample of the diorite contained 100 ppm Co, 700 ppm Cr, and 150 ppm Ni; and samples of mineralized rhyolite contained up to 0.7 ppm Ag (Karl, 1992, loc. 22a-c). ? the fissure veins are probably Late Cretaceous or younger, assuming that they formed during, or following, the regional metamorphism.

Comment (Reference): Primary Reference = Karl, 1992

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

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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