Brady Glacier Nickel-Copper Prospect

The Brady Glacier Nickel-Copper Prospect is a copper and nickel mine located in Alaska at an elevation of 3,301 feet.

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: Brady Glacier Nickel-Copper Prospect

Commodity

Primary: Copper
Primary: Nickel
Secondary: Cobalt
Secondary: PGE

Location

State: Alaska
District: Juneau/Glacier Bay N.M.

Land Status

Not available

Holdings

Not available

Workings

Not available

Ownership

Not available

Production

Not available

Deposit

Record Type: Site
Operation Category: Prospect
Operation Type: Unknown
Discovery Year: 1958
Years of Production:
Organization:
Significant: N
Deposit Size: L

Physiography

Not available

Mineral Deposit Model

Not available

Orebody

Not available

Structure

Not available

Alterations

Not available

Rocks

Not available

Analytical Data

Not available

Materials

Ore: Pentlandite
Ore: Chalcopyrite
Gangue: Serpentine
Gangue: Spinel
Gangue: Pyroxene
Gangue: Olivine
Gangue: Epidote
Gangue: Pyrrhotite
Gangue: Chromite

Comments

Comment (Location): USGS P 632, LOC. 72, FIG. 18; USGS MF-436, LOC. 8. LOCATION IS ON SMALL NUNATAK, AT 3300 FT ELEVATION ON BRADY GLACIER. HIGH NUNATAK IS 500 FT SW OF LOCATION AT 3500 FT ELEVATION. LAND STATUS VALUE CALCULATED 6-94 USING GIS OVERLAY ANALYSIS WITH BLM 1:2,500,000 SCALE OWNERSHIP STATUS MAP (1991).

Comment (Deposit): LARGEST KNOWN NICKEL DEPOSIT IN THE UNITED STATES. MOSTLY BURIED DEEP BENEATH BRADY GLACIER. ; INFO.SRC : 1 PUB LIT

Comment (Deposit): THIS SITE NAME WAS CREATED BY THE REPORTER OR OTHER USGS EMPLOYEE BASED ON PROXIMITY TO SOME MAJOR GEOGRAPHIC FEATURE.

Comment (Deposit): PYRRHOTITE, PENTLANDITE, AND CHALCOPYRITE OCCUR IN LAYERED PERIDOTITE AND GABBRO AS DISSEMINATED GRAINS, SMALL VEINLETS LESS THAN 1 MM THICK ALONG FISSURES AND FRACTURES, AND AS LENTICULAR MASSES UP TO 35 FT LONG AND 5 FT IN DIAMETER, OCCURRING MAINLY IN THE NE END OF SMALL NUNATAK. THE ONLY EXPOSED PORTIONS OF THE DEPOSIT ARE TWO SMALL NUNATAKS, SMALL AND HIGH NUNATAKS, SEPARATED FROM EACH OTHER BY 300 FT (A THIRD NUNATAK IS EXPOSED DURING LOW SNOW PERIODS). THEY ARE COMPLETELY SURROUNDED BY BRADY GLACIER, WHICH COVERS MOST OF THE DEPOSIT. DIAMOND DRILLING SHOWS MINERALIZATION EXTENDS ABOUT 1500-2000 FT NW AND SE OF THE NUNATAKS, TO THE CONTACT OF THE CRILLON-LAPEROUSE STOCK WITH BIOTITE SCHIST. LIMITS OF MINERALIZATION TO THE EAST AND WEST ARE UNKNOWN. TOTAL ORE RESERVES ARE ESTIMATED TO BE AT LEAST 100 MILLION TONS AT AN AVERAGE GRADE OF 0.5% NI AND 0.3% CU (USGS OF 78-494, P. C-99). THIS ALSO INCLUDES AN ESTIMATED RESERVE OF 288,000 OZ OF PLATINUM GROUP METALS (ECONOMIC

Comment (Deposit): GEOLOGY, V. 76, NO. 7, P. 2010).

Comment (Workings): SURFACE SAMPLING, AND A TOTAL OF 82 DIAMOND DRILL HOLES DRILLED FROM 1958-EARLY 1970'S. HOLES PENETRATED UP TO 1000 FT OF ICE AND OVER 2000 FT OF ROCK, AND WERE DRILLED OVER A WIDE AREA OF BRADY GLACIER, UP TO 4000 FT FROM THE NUNATAKS.

Comment (Geology): LAPEROUSE LAYERED GABBRO CONTACTS BIOTITE SCHIST ABOUT 3000 FT NW AND SE OF NUNATAKS.

Comment (Development): DISCOVERED IN 1958 BY FREMONT MINING CO. AND 224 CLAIMS FILED. 32 DIAMOND DRILL HOLES DRILLED IN 1958-59. NEWMONT EXPLORATION TOOK OVER MANAGEMENT IN 1960, DRILLED 14 MORE HOLES 20 CLAIMS PATENTED IN 1965. 36 MORE HOLES DRILLED BY 1970'S.

References

Reference (Deposit): USGS OF 78-316, P. 12 (1978)

Reference (Other Database): BAG-P-632-72

Reference (Deposit): USGS P-632, LOC. 72, PLATE 1, P. 79-82, FIG 18 (1971)

Reference (Deposit): USGS OF 78-494, PLATE III, P. C-96-101 (1978)

Reference (Deposit): USGS MF-436, LOC. 8 (1972)

Reference (Deposit): USGS P 1195, P. 1-8, FIGS. 1-6 (1981)

Reference (Deposit): ECONOMIC GEOLOGY AND THE BULLETIN OF THE SOCIETY OF ECONOMIC GEOLOGISTS, NOV. 1981, V. 76, NO. 7, P. 2001-2011

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