Table Mountain Mine
Yukon-Koyukuk, Alaska
65.4544°N 145.9132°W
65.4544°N 145.9132°W
The Table Mountain Mine is in Yukon-Koyukuk, Alaska. Historically the site has been part of the Circle Mining District. The ore mined is composed of pyrrhotite, enargite and gold with waste material consisting primarily of biotite, quartz and tourmaline. The host rock in this area is quartzite.
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THE METAMORPHIC ROCKS IN THE TABLE MOUNTAIN AREA BELONG TO THE QUARTZITE AND QUARTZITIC SCHIST UNIT OF FOSTER AND OTHERS (1983) AND ARE COMPOSED OF LIGHT GRAY QUARTZITE, BLACK BIOTITE SCHIST, FINE-GRAINED GREENISH-GRAY MAFIC ROCKS AND LIGHT-GREENISH-GRAY CALC-SILICATE ROCKS (BURACK, 1983 ). GRANITE CROPS OUT OVER AN AREA OF ONLY ABOUT 2 SQUARE KM, BUT THE DISTRIBUTION OF CONTACT METAMORPHOSED ROCKS SUGGESTS THAT GRANITE UNDERLIES MUCH OF THE TABLE MOUNTAIN AREA AT RELATIVELY SHALLOW DEPTHS (BURACK, 1983 ). MENZIE AND OTHERS (1987 ), REPORTED THAT THE HIGHEST CONCENTRATIONS OF GOLD (2. 6 TO 140 PPM) OCCUR JUST WEST OF TABLE MOUNTAIN IN BLACK BIOTITE SCHIST AND IN QUARTZ VEINS ADJACENT TO A FAULT ZONE (BRECCIA IN GRANITE) THAT IS INTRUDED BY A SULFIDE-BEARING HYPABYSSAL FELSIC DIKE. GOLD WAS DETECTED IN LESSER AMOUNTS (0. 05 TO 0. 2 PPM) IN COUNTRY ROCKS ADJACENT TO A GRANITE PLUTON THAT CROPS OUT FIVE KM TO THE NORTHEAST OF THE BLACK BIOTITE SCHIST. THE OCCURRENCES CONTAIN PYRRHOTITE, ARSENOPYRITE, MINOR CHALCOPYRITE, AND RARE ENARGITE AND SPHALERITE (MENZIE AND OTHERS, 1987, P. 1 ). THE TABLE MOUNTAIN OCCURRENCES SHOW TRACES OF SILVER AND LOW LEVELS OF TIN IN THE HYPABYSSAL DIKE AND IN AN IRON-STAINED SAMPLE OF THE BRECCIA. TWO SAMPLES OF A QUARTZ VEIN CONTAINING SULFIDES ALONG THE VEIN WALLS BOTH CONTAINED HIGH VALUES OF GOLD, ARSENIC, AND COPPER. ANTIMONY WAS DETECTED IN BOTH SAMPLES (MENZIE AND OTHERS, 1987, P. 4 ). IN THE OCCURRENCES IN AND ADJACENT TO THE GRANITE, GOLD WAS DETECTED ONLY IN THE SULFIDE-BEARING HYPABYSSAL FELSIC DIKE. SILVER AND TIN WERE DETECTED IN THE DIKE AND IN THE GRANITE ADJACENT TO THE DIKE. A SAMPLE OF THIS DIKE WITHOUT SULFIDES CONTAINED DETECTABLE TIN BUT NOT GOLD OR SILVER. A SAMPLE OF QUARTZITE FROM ADJACENT TO THE PLUTON DID NOT CONTAIN GOLD, SILVER, OR TIN IN DETECTABLE AMOUNTS (MENZIE AND OTHERS, 1987, P. 4 ). IN 1986, ALASKA DIVISION OF GEOLOGICAL AND GEOPHYSICAL SURVEYS COLLECTED SAMPLES OF AURIFEROUS TOURMALINE-QUARTZ VEINS AND HORNFELSED BIOTITE-TOURMALINE SCHISTS FROM THE TABLE MOUNTAIN AREA. FIELD WORK IN 1987 SHOWED THAT THE BIOTITE-TOURMALINE SCHISTS AND TOURMALINE-QUARTZ VEINS ARE PRESENT THROUGHOUT MUCH OF THE NORTH SIDE OF TABLE MOUNTAIN AND THAT THEY ARE NOT RESTRICTED TO FAULT ZONES. THE WIDESPREAD DISTRIBUTION OF THESE VEINS IS ATTRIBUTED EITHER TO (1) REMOBILIZATION FROM STRATIFORM OCCURRENCES OR (2) HYDROTHERMAL MINERALIZATION ASSOCIATED WITH NEARBY ABUNDANT FELSITE DIKES. THESE WIDSPREAD OCCURRENCES SUGGEST THAT THIS AREA HAS SIGNIFICANT LODE GOLD POTENTIAL (SMITH AND OTHERS, 1987, P. 6-15 ). CLAIMS WERE ACTIVE IN 1981, BUT TYPE OF WORK IS UNKNOWN (MENZIE AND OTHERS, 1983).
Geological materials at the site.
STATUS IS INACTIVE
MENZIE AND OTHERS, 1987
Other deposits in the same region.
Gold Occurrence Near Table Mountain
Unnamed Gold Occurrence
Table Mountain Uranium Prospect
Table Mountain Gold Occurrence
Unnamed Gold Occurrence
Unnamed Gold Occurrence
Unnamed Gold Occurrence
Mckinley Creek Gold Prospect
Bachelor Creek Gold Prospect
Bachelor Creek Gold Mine
* Mine bounds on map indicate the general area that a mine occupies. For an detailed map, refer to the overseeing BLM field office.
** The mine central point is based on an average of the mine's bounding box(es) and does not necessarily fall on the claim itself.
1 World-class significance is determined by total endowment of the contained commodity. This includes all past production and remaining reserves. Each commodity is considered separately and commodities cannot be combined to arrive at a significant size. The tonnage thresholds are from the mine model grade-tonnage studies. As of June 2008, many entries were classified as significant under less strict rules.
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Workings
SURFACE ROCK SAMPLES TAKEN. CLAIMS WERE ACTIVE IN 1981 BUT TYPE OF WORK IS UNKNOWN (MENZIE AND OTHERS, 1983).