1. Mineral Resources
  2. Online Spatial Data
  3. Mineral Resource Data System (MRDS)

Brady Glacier Nickel-Copper Prospect

Prospect in Alaska, United States with commodities Nickel, Copper, Cobalt, PGE
Map
XML
JSON
KML
B
Sections on this page
  1. Identification information
  2. Geographic coordinates
  3. Site location context
  4. Geographic areas
  5. Commodities
  6. Materials information
  7. Host and associated rocks
  8. Nearby scientific data
  9. Economic information about the deposit and operations
  10. Mining district
  11. Links to other databases
  12. Bibliographic references
  13. General comments
  14. Reporter information

Geologic information

Identification information

Deposit ID 10002234
MRDS ID A013136
Record type Site
Current site name Brady Glacier Nickel-Copper Prospect
Related records 10282642

Geographic coordinates

Geographic coordinates: -136.92904, 58.55388 (WGS84)
Elevation 1006

Site location context

Political divisions (FIPS codes)

Hoonah-Angoon(Census area)

Alaska(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Mount Fairweather C-3(quadrangle 1:63,360 scale)

Mount Fairweather NE(quadrangle 1:100,000 scale)

Mount Fairweather(quadrangle 1:250,000 scale)

Hydrologic units (watersheds)

Glacier Bay(hydrologic unit)

Northern Southeast Alaska(hydrologic accounting unit)

Southeast Alaska(hydrologic subregion)

Alaska(hydrologic region)

Federal lands

Glacier Bay National Park(National Park)

National Park NPS(Type of land area)

NPS(Federal land areas administered by NPS)

Geographic areas

Country State
United States Alaska

Comments on the location information

  • 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).

Commodities

Commodity Importance
Nickel Critical Primary
Copper Primary
Cobalt Critical Secondary
PGE Critical Secondary

Materials information

Materials Type of material
Chalcopyrite Ore
Pentlandite Ore
Chromite Gangue
Epidote Gangue
Olivine Gangue
Pyroxene Gangue
Pyrrhotite Gangue
Serpentine Gangue
Spinel Gangue

Host and associated rocks

  • Host or associated Associated
    Rock type Metamorphic Rock > Schist
  • Host or associated Host
    Rock type Plutonic Rock > Ultramafic Intrusive Rock > Peridotite > Dunite
    Rock unit name Laperouse Layered Gabbro (Crillon-Laperouse Stock);Laperouse Layered Gabbro (Crillon-Laperouse Stock);Laperouse Layered Gabbro (Crillon-Laperouse Stock);Laperouse Layered Gabbro (Crillon-Laperouse Stock)
    Rock description Laperouse Layered Gabbro (Crillon-Laperouse Stock);Laperouse Layered Gabbro (Crillon-Laperouse Stock);Laperouse Layered Gabbro (Crillon-Laperouse Stock);Laperouse Layered Gabbro (Crillon-Laperouse Stock)

Nearby scientific data

(1) -136.92904, 58.55388
ListMap

Economic information

Comments on the geologic information

  • LAPEROUSE LAYERED GABBRO CONTACTS BIOTITE SCHIST ABOUT 3000 FT NW AND SE OF NUNATAKS.

Economic information about the deposit and operations

Development status Prospect
Commodity type Metallic
Deposit size Large
Significant No
Discovery year 1958
Discoverer Fremont Mining Co.

Mining district

District name Juneau/Glacier Bay N.M.

Comments on the workings information

  • 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.

Comments on 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.

Reference information

Bibliographic references

  • Deposit

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

  • Deposit

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

  • Deposit

    USGS MF-436, LOC. 8 (1972)

  • Deposit

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

  • Deposit

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

  • Deposit

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

  • Other Database

    BAG-P-632-72

General comments

Subject category Comment text
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
Deposit GEOLOGY, V. 76, NO. 7, P. 2010).
Deposit LARGEST KNOWN NICKEL DEPOSIT IN THE UNITED STATES. MOSTLY BURIED DEEP BENEATH BRADY GLACIER. ; INFO.SRC : 1 PUB LIT
Deposit THIS SITE NAME WAS CREATED BY THE REPORTER OR OTHER USGS EMPLOYEE BASED ON PROXIMITY TO SOME MAJOR GEOGRAPHIC FEATURE.

Reporter information

Type Date Name Affiliation Comment
Reporter 01-APR-1987 Leonard, Kenneth R. (Huber, Donald F.) U.S. Geological Survey
Editor 02-SEP-1994 Mosier, Dan U.S. Geological Survey PARSED OUT HOST ROCK AND ASSOCIATED ROCK TYPES, AGES, UNIT NAMES, AND UNIT AGES.

Beyond USGS

Supplemental information added by qvyshift.com. Not part of the original USGS MRDS record.

Maps centered on this site

Authoritative Alaska resources

These are landing pages for further research — the state agencies don't currently expose per-mine deep links.