Unnamed (between Curtis Hills and Bruce Hills)

The Unnamed (between Curtis Hills and Bruce Hills) is a lead, silver, and copper 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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Site Name

Primary: Unnamed (between Curtis Hills and Bruce Hills)

Commodity

Primary: Lead
Primary: Silver
Primary: Copper
Secondary: Titanium
Secondary: Chromium
Secondary: Iron

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: Propylitic (?).

Rocks

Not available

Analytical Data

Not available

Materials

Gangue: Quartz
Gangue: Calcite
Gangue: Ankerite

Comments

Comment (Exploration): Status = Inactive

Comment (Deposit): Model Name = Distal low-sulfide quartz-carbonate veins: Possible trace element contribution from mafic dike hosts.

Comment (Deposit): Other Comments = the vein deposits are typical distal quartz-carbonate veins locally enriched in lead, copper, and silver. Prospecting closer to the granitic intrusives of the Bruce and Curtis Hills might find richer vein deposits, possibly transitional into copper and copper-molybdenum-bearing deposits.. The site is in Glacier Bay National Park and Preserve.

Comment (Geology): Geologic Description = The area is underlain by schist, hornfels, and marble derived mainly from sedimentary rocks of Paleozoic age. The sedimentary rocks were metamorphosed by the intrusion of a granitic batholith of Cretaceous age (Brew and others, 1978). The metasedimentary rocks are cut by mafic dikes and lie between the granitic Curtis and Bruce Hills. The area has recently been denuded by melting of the Plateau and Burroughs Glaciers. . The mineral occurrences of the area are mainly low-sulfide quartz-calcite-ankerite veins that formed on the contacts of mafic dikes that cut the metasedimentary rodk. Grab samples of various occurrences contained as much as 300 ppm lead, 700 ppm copper, and 15 ppm silver (MacKevett and others, 1971, location 23, table 9; Kimball and others, 1978, location 73, p. C316-317). Other elements, including chromium, iron, and titanium, are locally geochemically anomalous in the veins; these elements possibly were contained in or contributed to the veins by the mafic dikes. Titanium content exceeded 1 percent in one sample and was 1 percent in several others. Veins of the area could be distal structures to a buried contact zone between granite and the metasedimentary rocks.

Comment (Geology): Age = Cretaceous or younger.

Comment (Reference): Primary Reference = Kimball and others, 1978

Comment (Workings): Workings / Exploration = No workings. MacKevett and others (1971, location 23) found as much as 700 ppm copper and chromium and 1 percent titanium in iron-stained vein zones along mafic dikes. Kimball and others (1978, p. C316-317) reported 300 ppm lead and 15 ppm silver in a 0.3 foot thick quartz-calcite vein and more than 1 percent titanium in one wider (5 ft.) chip sample.

References

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.

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.

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