The Unnamed (in the northern Chilkat Range) is a copper 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
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Unnamed (in the northern Chilkat Range) MRDS details
Site Name
Primary: Unnamed (in the northern Chilkat Range)
Commodity
Primary: Copper
Primary: Silver
Secondary: Cobalt
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: Chalcopyrite
Gangue: Quartz
Comments
Comment (Geology): Geologic Description = Gilbert (1988) collected four rock samples described as, 'skarn with pyrrhotite (60%) and chalcopyrite', 'gossan with pyrrhotite', 'black schist with pyrrhotite (20%)', and 'quartz with pyrite in shear'. The samples contain up to 4.6 ppm silver, 5,950 ppm copper, and 95 ppm cobalt. The host rocks are mafic Paleozoic metavolcanics and metasediments that include argillaceous marble. Cretaceous medium-grained hornblende diorite and foliated granodiorite are nearby (Gilbert, 1988). The mineralization is probably the same age as the nearby Cretaceous intrusive rocks.
Comment (Reference): Primary Reference = Gilbert, 1988
Comment (Geology): Age = the age is inferred to be Cretaceous based upon the Cretaceous age of nearby intrusive rocks (Gilbert, 1988).
Comment (Deposit): Model Name = Copper skarn? (Cox and Singer, 1986: model 18b?)
Comment (Exploration): Status = Probably inactive
References
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.
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