The Unnamed (west of Crab Bay) is a silver, zinc, lead, copper, and gold 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: Silver, Zinc, Lead, Copper, Gold
Lat, Long: 55.11111, -131.39694
Map: View on Google Maps
Satelite View
MRDS mine locations are often very general, and in some cases are incorrect. Some mine remains have been covered or removed by modern industrial activity or by development of things like housing. The satellite view offers a quick glimpse as to whether the MRDS location corresponds to visible mine remains.
Unnamed (west of Crab Bay) MRDS details
Site Name
Primary: Unnamed (west of Crab Bay)
Secondary: Tyee?
Commodity
Primary: Silver
Primary: Zinc
Primary: Lead
Primary: Copper
Primary: Gold
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
Alteration Type: L
Alteration Text: Local silicification, sericitization, and dolomitization; minor oxidation of copper minerals.
Rocks
Name: Limestone
Role: Host
Age Type: Host Rock
Age Young: Late Permian
Analytical Data
Not available
Materials
Ore: Barite
Ore: Chalcopyrite
Ore: Galena
Ore: Malachite
Ore: Pyrite
Ore: Sphalerite
Ore: Tetrahedrite
Gangue: Calcite
Gangue: Quartz
Comments
Comment (Geology): Geologic Description = The country rocks in the area of this site are recrystallized rhyolite and overlying, locally dolomitic, limestone (Berg, 1972). These Upper Triassic rocks are complexly folded and faulted, and were regionally metamorphosed to greenschist-grade phyllite and semischist in Late Cretaceous time.? the occurrences consist of quartz pods and fissure veins up to about a foot thick in carbonate and volcanic rocks, and of quartz-calcite-barite veins in locally silicified carbonate rock (Karl, 1992, loc. 33). In addition to barite, these veins contain white mica, pyrite, sphalerite, and galena. ? At and near a prospect pit, samples of brecciated, dolomitic limestone carrying stringers and disseminated grains of pyrite, galena, and chalcopyrite; of nearby sulfide quartz veins; and of sheared pyritic rhyolite at the limestone contact contained as much as 0.05 ppm Au, 70 ppm Ag, 1000 ppm Pb, more than 1% Zn, 20 ppm Mo, and more than 5000 ppm Ba (Berg, 1972, loc. 5; Karl, 1992, loc. 33c). ? Reports based on fieldwork by private interests in the 1970s describe a mineralized zone 150 feet wide and 450 feet long at a rhyolite-dolomite contact. The zone contains quartz veins carrying galena, sphalerite, tetrahedrite?, and malachite (Karl, 1992, loc. 33). Another 150-foot by 450-foot zone in dolomite locally contains disseminated sulfides that assay up to 8% lead and zinc, as well as quartz veins containing sphalerite and galena. Two soil samples in rhyolite near the dolomite contained detectable gold; and pyritic limestone contained 150 ppm Pb.
Comment (Geology): Age = The fissure veins probably are Late Cretaceous or younger in age.
Comment (Deposit): Model Name = Polymetallic veins (Cox and Singer, 1986; model 22c)
Comment (Deposit): Other Comments = Early references to the Tyee prospect on Annette Island may refer to this site (Cobb and Elliott, 1980, p. 30).
Comment (Workings): Workings / Exploration = Prospect pit, probably dating to the 1930s. Samples at and near this pit contained as much as 0.05 ppm Au, 70 ppm Ag, 1000 ppm Pb, more than 1% Zn, 20 ppm Mo, and more than 5000 ppm Ba (Berg, 1972, loc. 5; Karl, 1992, loc. 33c). ? Reports based on fieldwork by private interests in the 1970s describe a mineralized zone 150 feet wide and 450 feet long at a rhyolite-dolomite contact. The zone contains quartz veins carrying galena, sphalerite, tetrahedrite?, and malachite (Karl, 1992, loc. 33). Another 150-foot by 450-foot zone in dolomite locally contains disseminated sulfides that assay up to 8% lead and zinc, as well as quartz veins containing sphalerite and galena. Two soil samples in rhyolite near the dolomite contained detectable gold; and pyritic limestone contained 150 ppm Pb.
Comment (Reference): Primary Reference = Karl, 1992
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): Cobb, E.H., and Elliott, R.L., 1980, Summaries of data on and lists of references to metallic and selected nonmetallic mineral deposits in the Ketchikan and Prince Rupert quadrangles, Alaska: U.S. Geological Survey Open-File Report 80-1053, 154 p.
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.
The Top Ten Gold Producing States
These ten states contributed the most to the gold production that built the West from 1848 through the 1930s. The Top Ten Gold Producing States.
