TJ Gold and Silver Project
Lease Status: Available
Exploration Target: A high-grade epithermal gold and silver deposit at moderate depths below a surface sinter. Gravel Creek analogue.
- A high-level epithermal system that has been drilled only to shallow depths.
- Surface rock chips reported up to 21.8 g/t gold; one 5 ft drill hole intercept of 5.8 g/t gold.
- Deepest holes show increasing gold, silver and pathfinders at depth.
- Main target area is obvious and located, many others may be buried. Target zone is the Miocene/basement unconformity like at Gravel Creek (new discovery in northern Elko Co.).
Property Location, District:
TJ is located in north central Elko County, NV about 20 miles southeast of Jackpot and the Idaho border. The land is composed of a combination of BLM and private mineral rights; the apparent primary target is wholly located on Genesis claims however.
The Gravel Creek project in western northern Elko County is the best analog for TJ. this is a new large gold/silver discovery by Western Exploration. They have intercepts of up to 16 meters of 49 g/t Au and another or 318 meters of 1.27 g/t Au. Mineralization there is hosted in silicified breccia formed at the basement/Miocene interface above a surface sinter and weak geochemical anomlies (Christensen, 2015).
The TJ project is localized in faulted-bounded graben withMiocene Humboldt Formation tuffaceous sediments and volcanics (Ts) sitting unconformably on a Jurassic granitic body (Jg). The tuffaceous sediments are locally silicified or argillized and the nearby granite is hematitic. The north part of the project area shows a large exposure of a white opal sinter cap to a hot spring system.
Alteration at the surface consists of clay alteration, silicification, and local pyrite in silicified sediments. Drilling has intersected massive silicification that is at least 500 feet thick. Limbach (1991) reports that:
“ Textures observed in the drill cuttings include multiple episodes of veining and brecciation and the replacement of calcite by silica.” He also noted that “Quartz (replacing calcite), barite, purple fluorite, and adularia accompany the hot spring suite of elements” (As, Sb, Hg).
Property History and Results:
The TJ property was explored by Kennecott and Challenger Gold from 1986 to 1992. Work during this period included mapping, rock chip sampling, soil sampling, a TDEM geophysical survey, and the drilling of 32 reverse circulation drill holes encompassing 13,559 feet.
Rock chip sampling returned several plus 1 gram gold samples from the southwest corner of the project area where the system appears to be more deeply dissected. Values of up to 21.8 g/t Au (0.70 opt gold) have been reported there. Elsewhere only the uppermost levels of the system are exposed and most rock samples contain less than about 0.100 g/t gold.
Drilling to date has been shallow, with a maximum depth of 550 feet. Most holes showed little to nil values with only one intercept over 1 g/t gold (5.8 grams at the bottom of hole 88-12). Several holes drilled in the vicinity of the opaline sinter showed strongly anomalous gold, silver and pathfinder element however with up to 0.235 g/t gold. In addition, several of these holes intersected strong silicification along with pyrite throughout but with alteration and mineralization generally increasing with depth.
Project Potential and Exploration Scenario:
The TJ project hosts the uppermost levels of a classic epithermal hot-spring system, including the original paleosurface, an opaline sinter cap. Work do-date has revealed many features indicative of a productive system including strong gold values, anomalous pathfinder elements and minerals, thick zones of silicification, and evidence of multiple veining and breccias events.
All these features suggest that TJ represents a strong target for deeper drilling, especially in light of the recent Gravel Creek discovery. The work to date has only begun to expose the potential and further exploration is strongly justified. Prior drilling was not deep enough to reach the Miocene/basement interfacte that could contain high grade gold and silver breccias. The hydrologic break between an impermeable granite body and the tuffaceous sediments could have induced boiling and deposition of bonanza gold values near that interface. In addition, geophysical techniques have not been intelligently employed and properly used could become a very robust and productive tool in this type of system.
Prior to drilling, further mapping and geophysics should be conducted to help delineate the extent of the system, much of which may be buried under recent cover, as well as to pinpoint structures, alteration and mineralization signatures. The TJ system could contain one or more high-grade vein and/or breccia bodies at moderate depths. While making an attempt to acquire the private mineral rights, a strong stand-alone exploration program could be conducted on the Genesis claims alone.