The Unnamed (near Tsirku Glacier ) is a zinc, lead, copper, gold, 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, Copper, Gold, Silver
Lat, Long: 59.32, -136.45000
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 (near Tsirku Glacier ) MRDS details
Site Name
Primary: Unnamed (near Tsirku Glacier )
Commodity
Primary: Zinc
Primary: Lead
Primary: Copper
Primary: Gold
Primary: Silver
Secondary: Cobalt
Secondary: Barium-Barite
Location
State: Alaska
District: Juneau (Skagway subdistrict)
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: Massive sulfide, kuroko
Model Name: Massive sulfide, Besshi (Japanese deposits)
Model Name: Polymetallic veins
Orebody
Not available
Structure
Not available
Alterations
Alteration Type: L
Alteration Text: Altered volcanics are mentioned but not described (Still and others, 1984).
Rocks
Name: Andesite
Role: Associated
Age Type: Associated Rock
Age Young: Late Permian
Analytical Data
Not available
Materials
Ore: Chalcopyrite
Ore: Galena
Ore: Pyrite
Ore: Pyrrhotite
Ore: Sphalerite
Gangue: Calcite
Gangue: Quartz
Comments
Comment (Reference): Primary Reference = Still and others, 1984 (OF 118-84)
Comment (Deposit): Model Number = 22c?, 24b?, 28a?
Comment (Deposit): Model Name = Unknown, but probably either a polymetallic quartz-sulfide vein or a Besshi- or Kuroko-type volcanogenic massive-sulfide occurrence (Cox and Singer, 1986; models 22c, 24b, 28a).
Comment (Geology): Geologic Description = According to Still and others (1984): 'Float and bedrock samples contain up to 6.2% zinc, 2.33% copper, 1.18% lead, 450 ppm cobalt, 49.84 ppm silver, 0.30 ppm gold, 1.13% barium, 200 ppm tin, 400 ppm arsenic, 300 ppm nickel, and 900 ppm bismuth. The samples include: 'pyrrhotite bearing quartz vein in slate', 'quartz boulder with 0.1 foot pyrrhotite band', 'massive pyrrhotite boulder with sparse quartz', 'altered volcanic boulder with massive sphalerite, chalcopyrite and galena(?)', and '70% silica, 30% sulfides - pyrrhotite, chalcopyrite and sphalerite.' Bedrock in the area is Paleozoic slate, metavolcanics, and limestone near a Cretaceous diorite, quartz diorite and granodiorite pluton (MacKevett and others, 1974).? the nature of this occurrence is unclear. It is probably either a polymetallic quartz-sulfide vein(s) or a volcanogenic, massive sulfide. If it is a vein(s), then it is probably Cretaceous based on the age of nearby intrusives (MacKevett and others, 1974). If it is a volcanogenic massive sulfide occurrence, then it is probably Late Triassic like the Windy Craggy and Greens Creek massive sulfide deposits (Still, 1984 [OF 118-84]; Newberry and others, 1997).
Comment (Exploration): Status = Probably inactive
Comment (Geology): Age = If it is a quartz-sulfide vein, it is probably Cretaceous, based on the age of nearby intrusives (MacKevett and others, 1974). If it is a volcanogenic massive sulfide, it is probably Late Triassic like the Windy Craggy and Greens Creek massive-sulfide deposits nearby (Still, 1984 (OFR 118-84); Newberry and others, 1997)
References
Reference (Deposit): Berg, H.C., 1984, Regional geologic summary, metallogenesis, and mineral resources of southeastern Alaska: U.S. Geological Survey Open-file Report 84-572, 298 p., 1 plate, scale approx. 1:600,000.
Reference (Deposit): Still, J.C., 1984, Stratiform massive sulfide deposits in the Mt. Henry Clay area, southeast Alaska: U.S. Bureau of Mines Open-File Report 118-84, 65 p.
Reference (Deposit): Still, J.C., Weir, K.R., Gilbert, W.G., and Redman, E.C., 1984, Stream-sediment, float, and bedrock sampling in the Porcupine mining area, southeast Alaska: U.S. Bureau of Mines Open-File Report 173-84, 19 p.
Reference (Deposit): MacKevett, E.M., Jr., Robertson, E.C., and Winkler, G.R., 1974, Geology of the Skagway B-3 and B-4 quadrangles, southern Alaska: U.S. Geological Survey Professional Paper 832, 33 p.
Reference (Deposit): Newberry, R.J., Crafford, T.C., Newkirk, S.R., Young, L.E., Nelson, S.W., and Duke, N.A., 1997, Volcanogenic massive sulfide deposits of Alaska, in Goldfarb, R.J. and Miller, L. D., eds., Mineral deposits of Alaska: Economic Geology Monograph 9, p. 120-150.
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.
