Deposit ID | 10002813 |
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MRDS ID | A015285 |
Record type | Site |
Current site name | Grant Mine |
Related records | 10232761 |
Geographic coordinates: | -147.95989, 64.8816 (WGS84) |
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Relative position | 8 MILES NW OF FAIRBANKS |
(click for info) |
Country | State |
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United States | Alaska |
Commodity | Importance |
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Gold | Primary |
Antimony | Tertiary |
Lead | Tertiary |
Tungsten | Tertiary |
Materials | Type of material |
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Galena | Ore |
Gold | Ore |
Scheelite | Ore |
Goethite | Gangue |
Muscovite | Gangue |
Host or associated | Host |
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Rock type | Metamorphic Rock > Schist |
(1) | -147.95989, 64.8816 |
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Development status | Producer |
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Commodity type | Metallic |
Deposit size | Small |
Significant | No |
Discovery year | 1929 |
Year of first production | 1931 |
District name | Fairbanks |
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Type | In-situ | ||||||||||||||
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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) | ||||||||||||||
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Agency | Database name | Acronym | Record ID | Notes |
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USGS | Mineral Resources Data System | MRDS | A015285 | |
Unknown | MF | MF | 0410-21 |
USGS MF-410 (D-2), LOC. 21
ADDGS OF 141, P. 1-2.
USGS BULL. 849-B, P. 150-151
USGS OFR 76-662, P. 65
MINING JOUNAL, APRIL 27, 1984, P. 285
ADGGS SPEC REPT 31, P. 11.
Subject category | Comment text |
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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. |
Type | Date | Name | Affiliation | Comment |
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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 |