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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Unnamed (near Driest Point) MRDS details
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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