The Unnamed (near LeBlondeau Glacier) is a silver, zinc, and copper 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 LeBlondeau Glacier) MRDS details
Site Name
Primary: Unnamed (near LeBlondeau Glacier)
Commodity
Primary: Silver
Primary: Zinc
Primary: Copper
Secondary: Gold
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: Skarn Cu
Orebody
Not available
Structure
Not available
Alterations
Alteration Type: L
Alteration Text: Skarn.
Rocks
Not available
Analytical Data
Not available
Materials
Ore: Pyrrhotite
Ore: Pyrite
Ore: Magnetite
Ore: Chalcopyrite
Gangue: Quartz
Gangue: Epidote
Comments
Comment (Reference): Primary Reference = Still and others, 1991
Comment (Geology): Geologic Description = Gilbert (1988) and Still and others (1991 [BOM, v. 2, Sec. A]) describe this occurrence as, 'a magnetite-chalcopyrite skarn that crops out near a diorite-marble contact.' They note that the skarn contains magnetite lenses up to 10 feet across, with associated grossularite garnet, epidote, and marble. Nearly all of 17 rock samples collected in this area contained substantially elevated levels of copper, silver, and zinc. Values were as high as 8,540 ppm copper, 10.8 ppm silver, 11,500 ppm zinc, 620 ppm cobalt, and 0.17 ppm gold. Brief descriptions of the rock samples refer to chalcopyrite, pyrite, pyrrhotite, and magnetite in association with iron-stained diorite and skarn. The mineralization is probably the same age as the Cretaceous diorite (Gilbert, 1988).
Comment (Deposit): Model Name = Copper skarn (Cox and Singer, 1986; model 18b).
Comment (Geology): Age = Probably Cretaceous based on the age of the associated diorite (Gilbert, 1988).
Comment (Exploration): Status = Probably inactive
References
Reference (Deposit): Gilbert, W.G., Still, J.C., Burns, L.E., Wier, K.R., and Redman, E.C., 1991, Geochemistry of Haines-Klukwan-Porcupine area, southeastern Alaska: Alaska Division of Geological and Geophysical Surveys Report of Investigations 91-5, 1 sheet, scale 1:63,360, 75 p.
Reference (Deposit): Still, J.C., Hoekzema, R.B., Bundtzen, T.K., Gilbert, W.G., Wier, K.R., Burns, L.E., and Fechner, S.A., 1991, Economic geology of Haines-Klukwan-Porcupine area, southeastern Alaska: Alaska Division of Geological and Geophysical Surveys Report of Investigations 91-4, 156 p., 5 sheets, scale 1:63,360.
Reference (Deposit): Gilbert, W.G., 1988, Preliminary geology and geochemistry of the north Chilkat Range: Alaska Division of Geological and Geophysical Surveys Report of Investigations 88-8, 2 sheets, scale 1:36,200.
Reference (Deposit): Still, J.C., 1991, Bureau of Mines mineral investigations in the Juneau mining district, Alaska, 1984 - 1988, v. 2, Detailed mine, prospect, and mineral occurrence descriptions, section A, Haines-Klukwan-Porcupine subarea: U.S. Bureau of Mines of Mines Special Publication, 214 p.
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