The Unnamed (upper Dundas Bay) is a tin, molybdenum, silver, and tungsten 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: Tin, Molybdenum, Silver, Tungsten
Lat, Long: 58.46, -136.54000
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Unnamed (upper Dundas Bay) MRDS details
Site Name
Primary: Unnamed (upper Dundas Bay)
Commodity
Primary: Tin
Primary: Molybdenum
Primary: Silver
Primary: Tungsten
Secondary: Gold
Secondary: Bismuth
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
Model Name: Porphyry Mo, low-F
Model Name: Sn skarn
Orebody
Not available
Structure
Not available
Alterations
Alteration Type: L
Alteration Text: Contact metasomatism, development of skarn.
Rocks
Not available
Analytical Data
Not available
Materials
Ore: Cassiterite
Ore: Molybdenite
Ore: Powellite
Ore: Scheelite
Gangue: Diopside
Gangue: Epidote
Gangue: Garnet
Comments
Comment (Exploration): Status = Inactive
Comment (Deposit): Model Name = Skarn and molybdenum-tungsten-tin porphyry similar to Sn skarn and porphyry Mo of Cox and Singer (1986; model 14b and 21b).
Comment (Deposit): Model Number = 14b, 21b
Comment (Deposit): Other Comments = the site is in Glacier Bay Park and Preserve.
Comment (Commodity): Ore Material = unknown Bi-bearing mineral
Comment (Geology): Age = Tertiary.
Comment (Reference): Primary Reference = Kimball and others, 1978
Comment (Workings): Workings / Exploration = There are no known workings. MacKevett and others (1971) reported anomalous concentrations of tungsten in stream sediments in 1966. I followed up these anomalies in 1972 for Union Carbide. We confirmed the results and found abundant scheelite in panned concentrates, but did not proceed because the location was then in the National Monument; the future of development was uncertain. More samples were collected by the Bureau of Mines (Kimball and others, 1978, p. C257-C263). Apparently the Bureau concentrated more on the skarn and Cretaceous rocks than on the Tertiary intrusive.
Comment (Geology): Geologic Description = The country rocks in the area of this occurrence consist mainly of sedimentary rocks of Paleozoic age and sedimentary and granitic intrusive rocks of Paleozoic age. The area is east of the major fault that separates Mesozoic from Paleozoic terrane in southwest Glacier Bay National Park and Preserve (Brew and others, 1978). A granitic (granodiorite ) pluton of Tertiary age invades older sedimentary and granitic rock, including pendants of Paleozoic limestone, partly converting the limestone to skarn. ? This occurrence encompasses an area characterized by anomalous amounts of molybdenum, tin, and tungsten in stream-sediment samples, rock samples, and in outcropping metaliferous skarn. The anomalous area is elongated east-west on the contact between Tertiary granodiorite to the south and Cretaceous and older sedimentary and igneous rocks to the north. The skarn, mainly developed in limestone of Paleozoic age, contains powellite and as much as 150 ppm tin , 200 ppm bismuth, 79 ppm tungsten and 8.5 ppm gold (Kimball and others, 1978, p. C257-C263). Scheelite and molybdenite also occur locally and scheelite is relatively abundant in panned concentrates. The sources of the anomalies are not fully known, but they probably include both the granitic rocks and the contact skarn zones.
Comment (Commodity): Ore Material = unknown Bi-bearing mineral
References
Reference (Deposit): Cobb, E.H., 1981, Summaries of data on and lists of references to metallic and selected nonmetallic mineral occurrences in the Mt. Fairweather quadrangle, Alaska; Supplement to Open-file Report 78-316; Part A, Summaries of data to January 1, 1980: U.S. Geological Survey Open-File Report 81-249-A, 20 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., 1981, Summaries of data and lists of references to metallic and selected non-metallic mineral occurrences in the Mt. Fairweather quadrangle, Alaska, Supplement to Open-file Report 78-316: U. S. Geological Survey Open-File Report 81-249B, 15 p.
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): 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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