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Grant Mine

Producer in Alaska, United States with commodities Gold, Antimony, Lead, Tungsten
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Geologic information

Identification information

Deposit ID 10002813
MRDS ID A015285
Record type Site
Current site name Grant Mine
Related records 10232761

Geographic coordinates

Geographic coordinates: -147.95989, 64.8816 (WGS84)
Relative position 8 MILES NW OF FAIRBANKS
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Geographic areas

Country State
United States Alaska

Comments on the location information

  • USGS MF-410, LOC. 21. MINE MARKED ON FAIRBANKS (D-2) ALONG ST. PATRICK RD ON THE SE FLANK OF ESTER DOME. LAND STATUS VALUE CALCULATED 6-94 USING GIS OVERLAY ANALYSIS WITH BLM 1:2,500,000 SCALE OWNERSHIP STATUS MAP (1991).

Commodities

Commodity Importance
Gold Primary
Antimony Tertiary
Lead Tertiary
Tungsten Tertiary

Materials information

Materials Type of material
Galena Ore
Gold Ore
Scheelite Ore
Goethite Gangue
Muscovite Gangue

Alteration

  • (Local) Breccia Zones Heavily Oxidized In Places

Host and associated rocks

  • Host or associated Host
    Rock type Metamorphic Rock > Schist

Nearby scientific data

(1) -147.95989, 64.8816
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Comments on the geologic information

  • THE O'DEA BRECCIA ZONE TRENDS OBLIQUELY TO THE IRISHMAN VEIN FAULT WITH AN AVERAGE STRIKE OF N 45-54 E. IF THE STRIKE AND DIP OF THE O'DEA-BRECCIA AND IRISHMAN ZONES PERSIST AT DEPTH, THEY MAY INTERSECT BELOW THE 200 FT. LEVEL. WIDTH OF THE ORE STRUCTURES IN ALL SYSTEMS APPEAR TO BE CONTROLED BY THE RELATIVE COMPETENCY OF THE HOST ROCK.

Economic information

Economic information about the deposit and operations

Development status Producer
Commodity type Metallic
Deposit size Small
Significant No
Discovery year 1929
Year of first production 1931

Mining district

District name Fairbanks

Reserves and resources

  • Type In-situ
    Estimate year 1983
    Total resources 317,000mt ore
    Remarks Entry carried over from Old MRDS or added later (i.e. it did not originate in ARDF)
    Commodity Subtype Grade units Group Importance Year
    Gold Au 20 g/mt Gold Major 1983

Comments on the workings information

  • PRINCIPAL UNDERGROUND WORKINGS CONSIST OF OVER 2,700 FT. OF DRIFTS, CROSSCUTS, AND RAISES ON THE 100, 150, AND 200 FT. LEVELS OF THE IRISHMAN SYSTEM, AND THE 80, 120, AND 200 FT. LEVELS OF THE O'DEA BRECCIA ZONE.

Comments on development

  • AURIFEROUS QUARTZ VEIN DISCOVERED AT BOTTOM OF PLACER PROSPECT SHAFT, 1929. AS OF 1931 THERE WERE 250 FT. OF DRIFTS ON 2 LEVELS AND 500-600 TONS OF ORE THAT RETURNED ABOUT 1 OZ./TON HAD BEEN MINED. MINING IN 1937 REPORTED. UNREPORTED MINING OCCURRED IN OTHER YEARS. MUCH EXPLORATION AND DEVELOPMENT WORK BY TRICON INC IN THE 1980'S ON THE IRISHMAN VEIN AND O'DEA BRECCIA ZONE; OTHER DEPOSITS HAVE BEEN DISCOVERED DURING UNDERGROUND DRIFTING, DRILLING PROGRAMS, AND GEOPHYSICAL INVESTIGATIONS. PRESENT PRODUCTION BY TRICON INC., WHO NOW HAS A GRAVITY-FEED MILL FACILITY THERE, IS LIKELY.

Reference information

Links to other databases

Agency Database name Acronym Record ID Notes
USGS Mineral Resources Data System MRDS A015285
Unknown MF MF 0410-21

Bibliographic references

  • Deposit

    USGS MF-410 (D-2), LOC. 21

  • Deposit

    ADDGS OF 141, P. 1-2.

  • Deposit

    USGS BULL. 849-B, P. 150-151

  • Deposit

    USGS OFR 76-662, P. 65

  • Deposit

    MINING JOUNAL, APRIL 27, 1984, P. 285

  • Deposit

    ADGGS SPEC REPT 31, P. 11.

General comments

Subject category Comment text
Deposit INFORMATION FROM MRDS RECORD NUMBER A010696 WAS INCORPORATED INTO THIS RECORD AND DELETED BY DAVE FRANK, SPOKANE MIO, 1/94.
Deposit PRINCIPAL LODES ARE IRISHMAN VEIN AND O'DEA BRECCIA ZONE. THE IRISHMAN VEIN FAULT CONTAINS AT LEAST THREE AGES OF VEIN QUARTZ; LATE STAGE SILICA INJECTION WAS ACCOMPANIED BY FREE GOLD, ARSENOPYRITE, LEAD-ANTIMONY SULFOSALTS, AND SCHEELITE. ORE FLUIDS WERE EMPLACED ALONG A FAULT ZONE TRENDING SINUOUSLY N 20-40 E AND DIPPING STEEPLY TO THE SE. VEIN WIDTHS VARY FROM 3 TO OVER 22 IN. O'DEA BRECCIA ZONE: AURIFEROUS QUARTZ BRECCIA CEMENTED BY IRON, ARSENIC, AND ANTIMONY OXIDES, BROKEN SCHIST FRAGMENTS, MYLONITE, AND MINOR SULFIDE ZONES. VEIN-FAULT WIDTHS VARY FROM 6 IN. TO OVER 6 FT., AND AVERAGE 42 IN. MULTIPLE SILICA INJECTIONS OCCURRED ALONG THE O'DEA BRECCIA ZONE; RECURRENT MOVEMENT ALONG THE VEIN-FAULT ZONE RESULTED IN HEAVILY OXIDIZED BROKEN AND BRECCIATED ZONES.

Reporter information

Type Date Name Affiliation Comment
Reporter 01-JUN-1987 Powers, M.T. (Huber, D.F.) U.S. Geological Survey
Updater 20-SEP-1994 Frank, Dave U.S. Geological Survey PARSED OUT HOST ROCK AND ASSOCIATED ROCK TYPES, AGES, UNIT NAMES, AND UNIT AGES.
Editor 15-AUG-1995 Mosier, Dan U.S. Geological Survey