The Island Mountain is a molybdenum, zinc, 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: Molybdenum, Zinc, Copper, Gold
Lat, Long: 61.78, -152.74000
Map: View on Google Maps
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Island Mountain MRDS details
Site Name
Primary: Island Mountain
Commodity
Primary: Molybdenum
Primary: Zinc
Primary: Copper
Primary: Gold
Secondary: Iron
Secondary: Arsenic
Location
State: Alaska
District: Yentna
Land Status
Not available
Holdings
Not available
Workings
Not available
Ownership
Not available
Production
Not available
Deposit
Record Type: Site
Operation Category: Prospect
Operation Type: Unknown
Years of Production:
Organization:
Significant:
Physiography
Not available
Mineral Deposit Model
Not available
Orebody
Not available
Structure
Not available
Alterations
Alteration Type: L
Alteration Text: Propylitic (chlorite-epidote-carbonate +/- magnetite); argillic/sericitic; silicic.
Rocks
Role: Host
Age Type: Host Rock
Age Young: Early Oligocene
Age Old: Early Cretaceous
Analytical Data
Not available
Materials
Ore: Arsenopyrite
Ore: Chalcopyrite
Ore: Gold
Ore: Molybdenite
Ore: Pyrite
Ore: Pyrrhotite
Ore: Sphalerite
Gangue: Magnetite
Gangue: Quartz
Comments
Comment (Exploration): Status = Inactive
Comment (Geology): Age = Host rocks are late Cretaceous or Early Tertiary based on K-Ar ages published by Reed and Elliott (1970). The deposit is probably related to these intrusions.
Comment (Deposit): Model Name = Porphyry copper(?); porphyry copper-gold(?); polymetallic vein; replacement
Comment (Geology): Geologic Description = Reed and Elliott (1970) show this locality to be underlain by Mesozoic sediments (KJs) of the Kahlitna terrane that are intruded by a small body of granite and quartz monzonite (TKig). Detailed mapping in the late 1980's by Cominco American Incorporated identified veins and disseminations of pyrite-chalcopyrite and arsenopyrite-gold and stockwork quartz veins with magnetite and trace amounts of molybdenite cutting fine- to medium- grained plagioclase-hornblende porphyritic andesite and medium-grained monzonitic plutonic rocks at this site. Carbonate-rich beds in the sedimentary country rocks are locally replaced with pyrrhotite, pyrite, and sphalerite. Numerous occurrences are reported over an 8 square mile area. (Cominco American Incorporated, unpublished reports, 1987and 1988.) Host rocks are most likely Late Cretaceous or Early Tertiary(?) based on nearby K-Ar ages published by Reed and Lanphere (1972). Mineralization is probably related to these intrusions.
Comment (Reference): Primary Reference = Reed and Elliott, 1970.
Comment (Workings): Workings / Exploration = Exploration included silt sampling, mapping, rock and contour soil sampling, soil grid geochemical surveys, magnetic and VLF geophysical surveys and diamond drilling by Cominco America in mid-1980's.
Comment (Geology): Age = Host rocks are Eocene - Late Cretaceous.
References
Reference (Deposit): Reed, B.L., and Elliott, R.L., 1970, Reconnaissance geologic map, analyses of bedrock and stream sediment samples, and an aeromagnetic map of parts of the southern Alaska Range: U.S. Geological Survey Open-file Report 70-271, 24 p., 4 sheets, scale 1:250,000.
Reference (Deposit): Reed, B.L., and Elliot, R.L., 1970, Reconnaissance geologic map, analyses of bedrock and stream sediment samples, and an aeromagnetic map of parts of the southern Alaska Range: U.S. Geological Survey Open-file Report 70-271, 24 p., 4 plates, scale 1:250,000.
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