The Old Man Diorite is a molybdenum, silver, 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, Silver, Gold
Lat, Long: 61.91, -152.32000
Map: View on Google Maps
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Old Man Diorite MRDS details
Site Name
Primary: Old Man Diorite
Commodity
Primary: Molybdenum
Primary: Silver
Primary: Gold
Secondary: Arsenic
Secondary: Barium-Barite
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: Carbonate, pyrite, sericite, quartz
Rocks
Role: Host
Age Type: Host Rock
Age Young: Early Miocene
Age Old: Early Cretaceous
Analytical Data
Not available
Materials
Ore: Molybdenite
Ore: Pyrite
Ore: Arsenopyrite
Ore: Chalcopyrite
Ore: Gold
Ore: Pyrrhotite
Ore: Sphalerite
Gangue: Quartz
Gangue: Chlorite
Comments
Comment (Geology): Age = The host rock is late Cretaceous/Early Tertiarydiorite; the veins may be related to the diorite intrusion.
Comment (Exploration): Status = Inactive
Comment (Commodity): Gangue = Carbonate
Comment (Deposit): Model Name = Polymetallic veins
Comment (Geology): Geologic Description = At this locality a Late Cretaceous/Early Tertiary(?) diorite is cut by shallow (10-30 degree) veins less than 1 foot to 5 foot thick, and poorly developed stockwork veins. Mineralization consists of varying amounts of quartz, chlorite, arsenopyrite, pyrite, pyrrhotite, molybdenite, and carbonate. The best gold grades are associated with zones of sub-parallel veins. Gold ranges from ten's of ppb to 0.122 oz/ton (Cominco American Incorporated, unpublished reports, 1986-1987). The diorite is probably one of the late Cretaceous/Early Tertiary Kichatna plutons (TKk) described by Reed and Nelson (1980) in the Talkeetna quadrangle to the north. A K-Ar age of 67.4 +/-2 m.y. suggests that these plutons may be slightly older than the 65-km belt of composite plutons to the west. The veins may be related to the diorite intrusion.
Comment (Workings): Workings / Exploration = Exploration work included silt and rock chip geochemical sampling, mapping, and diamond drilling. The property is steep and technical climbers with Dihedral Exploration were employed to conduct geologic and geochemical surveys.
Comment (Reference): Primary Reference = Reed and Elliott, 1970
Comment (Geology): Age = Host rock is Paleogene - Late Cretaceous.
References
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.
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.
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