Unnamed (near LeBlondeau Glacier)

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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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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