Unnamed (Brady Glacier outwash)

The Unnamed (Brady Glacier outwash) is a gold, titanium, and zirconium 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 (Brady Glacier outwash)

Commodity

Primary: Gold
Primary: Titanium
Primary: Zirconium
Secondary: PGE

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: Past Producer
Operation Type: Unknown
Years of Production:
Organization:
Significant:

Physiography

Not available

Mineral Deposit Model

Not available

Orebody

Not available

Structure

Not available

Alterations

Not available

Rocks

Name: Till
Role: Host
Age Type: Host Rock
Age Young: Holocene

Analytical Data

Not available

Materials

Ore: Ilmenite
Ore: Zircon
Ore: Gold

Comments

Comment (Workings): Workings / Exploration = Small, transient placers on the outwash plain were worked during the early years of the twentieth century (Rossman, 1963, B 1121-K, p. K51-52). The U.S. Bureau of Mines (Kimball and others, 1978, p. C126) detected gold content in stream-sediment-type samples of up to 0.15 ppm (0.004 oz/ton) along with traces of silver, copper, cobalt, and nickel. The gold is extremely fine-grained, but local concentrations could have been rich. The gold is so fine that recovery is difficult.? Foley and others (1995, sample no. 319) determined that ilmenite (titanium) and zircon (zirconium) were present in one sample in anomalous amounts. The sample contained 4.95 percent and 6.15 percent titanium, respectively, in a head split and a spiral concentrate. Zirconium was reported as 720 ppm in the head split and 1084 ppm in the spiral concentrate.

Comment (Exploration): Status = Inactive

Comment (Commodity): Ore Material = Gold (native)

Comment (Commodity): Ore Material = Gold (native)

Comment (Commodity): Ore Material = PGE

Comment (Geology): Geologic Description = Brady Glacier occupies a major north-northwest-aligned boundary between Paleozoic strata intruded by granitic rocks of Cretaceous age on the east and rocks of Cretaceous and Tertiary age to the west (Brew and others, 1978). The Brady Glacier nickel-copper deposit (MF003) is in the western province and within the drainage basin of the glacier. Glacial erosion of the sulfide and oxide deposits of the Crillon-LaPerouse layered mafic intrusion, the host of the Brady Glacier deposit, would furnish titanium and PGEs to the glacial outflow. Gold deposits similar to the LeRoy mine (MF022) could exist in the Cretaceous rocks in the eastern terrane.? Gold, in extremely fine-grained form, ilmenite, PGEs, and zircon locally are concentrated in transient placers at the front of the glacier.? Placer samples collected from the outwash fan by the U.S. Bureau of Mines contained as much as 0.15 ppm gold (Kimball and others, 1978) and 6.15 percent titanium (Foley and others,1995).

Comment (Deposit): Model Name = Placer: Low-grade glacial outwash reworked on tidal flat.

Comment (Deposit): Other Comments = the placer sites are in Glacier Bay National Park and Preserve.

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

Comment (Geology): Age = Holocene.

References

Reference (Deposit): Foley, J.Y., La Berge, R.D., Grosz, A.E., Oliver, F.S., and Hirt, W.C., 1995, Onshore titanium and related heavy mineral investigations in the eastern Gulf of Alaska region, southern Alaska: U.S. Bureau of Mines Open-File Report 10-95, 125 p.

Reference (Deposit): Rossman, Darwin, 1963, Geology of the eastern part of the Mount Fairweather quadrangle, Glacier Bay, Alaska: U.S. Geological Survey Bulletin 1121-K, p. K1-K57.

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): 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): 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.

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