The Unnamed (east of Dundas Bay) is a copper and molybdenum 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 (east of Dundas Bay) MRDS details
Site Name
Primary: Unnamed (east of Dundas Bay)
Commodity
Primary: Copper
Primary: Molybdenum
Secondary: Silver
Location
State: Alaska
District: Juneau
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
Not available
Orebody
Not available
Structure
Not available
Alterations
Alteration Type: L
Alteration Text: Local oxidation of copper minerals.
Rocks
Name: Diorite
Role: Host
Age Type: Host Rock
Age Young: Late Cretaceous
Analytical Data
Not available
Materials
Ore: Chalcopyrite
Ore: Malachite
Ore: Molybdenite
Gangue: Quartz
Comments
Comment (Deposit): Model Name = Low-sulfide quartz-copper-bearing vein.
Comment (Deposit): Other Comments = the occurrence is in Glacier Bay National Park and Preserve.
Comment (Exploration): Status = Inactive
Comment (Workings): Workings / Exploration = There are no workings. A representative sample of copper-stained sheared and quartz-veined quartz diorite collected by MacKevett and others (1971, table 9 location 32) contained 1000 ppm copper and 300 ppm molybdenum. Chip samples collected by Bureau of Mines (Kimball and others, 1978, p. C270) contained as much as 1900 ppm copper, 10 ppm molybdenum and 1 ppm silver.
Comment (Geology): Geologic Description = A foliated quartz diorite of Cretaceous age forms a stock-like pluton on the east side of the mouth of Dundas Bay. It is in contact to the north with metamorphosed sedimentary rocks of Devonian and Silurian age (Brew and others, 1978). MacKevett and others (1971) found malachite-stained quartz stringers, containing chalcopyrite and molybdenite, within quartz veins in cataclastic quartz diorite. The veins are of Late Cretaceous or younger age.? A sample collected to represent quartz-vein-bearing sheared rock contained 1000 ppm copper and 300 ppm molybdenum. Samples collected by the U.S. Bureau of Mines from the same or nearby sites contained as much as 1900 ppm copper, 10 ppm molybdenum, and 1 ppm silver.
Comment (Reference): Primary Reference = MacKevett and others, 1971
Comment (Geology): Age = Probably Cretaceous or younger.
References
Reference (Deposit): Brew, D.A., Johnson, B.R., Grybeck, D., Griscom, A., Barnes, D.F., Kimball, A.L., Still, J.C., and Rataj, J.L., 1978, Mineral resources of the Glacier Bay National Monument Wilderness Study Area, Alaska: U.S. Geological Survey Open-File Report 78-494, 670 p.
Reference (Deposit): MacKevett, E.M., Jr., Brew, D.A., Hawley, C.C., Huff, L.C., and Smith, J.G., 1971, Mineral resources of Glacier Bay National Monument, Alaska: U.S. Geological Survey Professional Paper 632, 90 p., 12 plates, scale 1:250,000.
Reference (Deposit): Cobb, E.H., 1972, Metallic mineral resources map of the Mount Fairweather quadrangle, AK: U.S. Geological Survey Miscellaneous Field Study Map MF-436, 1 sheet, scale 1:250,000.
Reference (Deposit): Kimball, A.L., Still, J.C., and Rataj, J.L., 1978, Mineral resources, in Brew, D. A., and others, Mineral resources of the Glacier Bay National Monument wilderness study area, Alaska: U.S. Geological Survey Open-File Report 78-494, p. C1-C375.
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