The Unnamed (near Sylburn Harbor) 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
Elevation:
Commodity: Zinc, Lead, Barium-Barite, Silver
Lat, Long: 55.174, -131.57400
Map: View on Google Maps
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Unnamed (near Sylburn Harbor) MRDS details
Site Name
Primary: Unnamed (near Sylburn Harbor)
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: Country rocks locally are sericitized and permeated with hydrothermal hematite.
Rocks
Not available
Analytical Data
Not available
Materials
Ore: Sphalerite
Ore: Pyrite
Ore: Galena
Ore: Barite
Gangue: Quartz
Gangue: Calcite
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 include recrystallized Upper Triassic carbonate and clastic rocks, rhyolite, and basalt; Silurian trondhjemite; and greenstone derived from undivided Silurian and Ordovician volcanic, sedimentary, and intrusive rocks (Berg, 1972 [I 684]; Berg and others, 1988; Karl, 1992). The rocks are folded and locally intensely sheared, sericitized, and permeated with hydrothermal hematite. The rocks were regionally metamorphosed to greenschist-grade phyllite and semischist in Late Cretaceous time. The occurrences consist of quartz-barite-calcite-sulfide fissure veins as much as three feet thick, in sheared, siliceous phyllite, greenstone, rhyolite, and limestone (Karl, 1992, loc. 20a-f). Sulfide minerals, inferred from sample analyses, probably are mainly pyrite, galena, and sphalerite. Samples of sulfide-bearing quartz, calcite, and barite veins contained up to 20 ppm Ag, 2% Pb, more than 1% Zn, and 100 ppm Ni; a sample of limestone contained 1000 ppm Ba, 100 ppm Pb, and 500 ppm Zn; a sample of greenstone contained 200 ppm Zn, 100 ppm Co, 100 ppm Cr, and 100 ppm Ni; and samples of rhyolite and rhyolite tuff breccia contained up to 1 ppm Ag, 1% Ba, and 200 ppm Cu (Karl, 1992, loc. 20a-f).
Comment (Geology): Age = Fissure veins probably are Late Cretaceous or younger.
Comment (Reference): Primary Reference = Karl, 1992
Comment (Workings): Workings / Exploration = Samples of sulfide-bearing quartz, calcite, and barite veins contained up to 20 ppm Ag, 2% Pb, more than 1% Zn, and 100 ppm Ni; a sample of limestone contained 1000 ppm Ba, 100 ppm Pb, and 500 ppm Zn; a sample of greenstone contained 200 ppm Zn, 100 ppm Co, 100 ppm Cr, and 100 ppm Ni; and samples of rhyolite and rhyolite tuff breccia contained up to 1 ppm Ag, 1% Ba, and 200 ppm Cu (Karl, 1992, loc. 20a-f).
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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