Unnamed (upper Dundas Bay)

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

Satelite View

MRDS mine locations are often very general, and in some cases are incorrect. Some mine remains have been covered or removed by modern industrial activity or by development of things like housing. The satellite view offers a quick glimpse as to whether the MRDS location corresponds to visible mine remains.

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.

The Top Ten Gold Producing States

These ten states contributed the most to the gold production that built the West from 1848 through the 1930s. The Top Ten Gold Producing States.