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Silverton Project

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Silverton Project (Nye County, Nevada, USA)

> SILVERTON PROJECT REPORT (PDF, 4.7MB)

Commodities: Ag, Au

Deposit types: Epithermal         

Location:
Nye County, Nevada
Sect 22-27, T8N, R54E
38o 32’ 0” N / 115o 52’ 30” W
599,000mE / 4,265,000mN

Located northeast of Tonopah in the central Pancake Range.  Travel east from Tonopah on HWY 6 for about 85 miles.  4.5 miles east of Black Rock Summit turn north on an unimproved dirt road and travel northwest for about 2 miles to the center of the property. 

Land Holding
The Silverton claim block consists of 72 lode claims staked by Newcrest in March, 2002 (Table 1, Figure 1).

Table 1: Silverton Claims

Claim Names/Numbers

# of Claims

BLM Serial Numbers

EASTER NO 1-30

30

NMC829089-NMC829118

EASTER NO 42-65

24

NMC829130-NMC829153

EASTER NO 89-106

18

NMC829177-NMC829194

History
Small scale mining occurred in the area from 1930 to 1937 and in 1953.  Total production for the district is <100,000 oz silver, <2,000 oz gold and <1 ton of antimony.  Over the last three decades the property has been explored for gold and silver by multiple companies including Olympic Mining, Westgold, Newmont and Pittston.  Work completed comprises: geochemical sampling, fluid inclusion studies, mapping, geophysics and drilling (~45 pre-Newcrest holes). 

Since 2002 Newcrest has taken over 1,000 rock chip samples and drilled 42,983 ft in 29 RC holes.

Geology/Mineralisation
The Silverton district occurs at the eastern margin of a caldera complex dated at 34Ma.  Both high and low angle faults and fault breccias related to caldera rim tectonics are observed on the property.  Rocks consist of Paleozoic dolomite/limestone detachment blocks surrounded and underlain by Tertiary rhyolite tuffs.  Rholite dikes have also been mapped along caldera ring fractures and north trending faults. 

Tuffs around the Paleozoic rocks are locally bleached and argillized (kaolinite).  Both units are silicified along faults, generally as jasperoid bodies up to 30 ft wide.  Jasperoid also forms flat-lying replacement horizons within volcanic beds.  Additional silicification includes, stockwork silica veining and chalcedony +- stibnite-pyrite veins.  One to two percent disseminated pyrite and minor stibnite occur in tuffaceous rocks over a 4mi2 area.  Other mineralisation includes barite, gypsum, and alunite.  Ore-grade gold values are generally associated with veins, strongly veined limestone, and argillized tuff along mineralized structures and adjacent to jasperoid.  Most jasperoid bodies themselves contain only low-level gold. 

The property contains a >100ppb Au rock chip anomaly measuring 2.5km x 3km.  Au, Ag, As, and Hg mineralisation are broadly coincident.  Within the anomaly, the most significant of three main zones is a NNE trending area >0.5g/t Au measuring 1km x 0.5km and centered on a 100m wide silicified contact between rhyolite to the east and carbonate rocks to the west.  

Old vertical drilling on the southern end of the Silverton Shear returned several intervals of 5ft @ 1-5g/t Au and 100-600g/t Ag.  The best Newcrest intercept is 25 feet @ 2.3g/t Au in rhyolite tuff.

Geophysics
CSAMT resistivity and ground magnetic surveys were completed by Pittston in 1998 and 1999.  Regional aeromagnetics also cover the property. 

Mining/Metallurgy
Mining parameters such as rock quality are unknown.  No metallurgical testing has been done on rocks from the Silverton district and potential recoveries are also unknown.  However, gold occurrence is fine grained, probably micron sized as none is observed in pan concentrates.

Exploration Potential
The geologic environment is very similar to Round Mountain, however no centralized source of mineralisation or multi-ounce bonanza grades have yet been identified.  Also, the district is considered to lie at a relatively high erosion level in terms of epithermal deposits.  Untested areas include a 1km zone along the Silverton Shear with a 0.1-1.5g/t Au anomaly at surface.

Permitting/Community/Environment
As of November, 2008 the BLM determined reclamation to be complete by federal standards. 

No community or environmental issues are known to exist.

 

Location of the Gabbs, Crow Springs and Silverton Projects in Nevada, USA (Google Earth)

 

SILVERTON PROJECT LINKS:
> SILVERTON PROJECT REPORT (PDF, 4.7MB)
> SILVERTON PROJECT IMAGE GALLERY

RELATED PROJECTS:
> FERBER PROJECT (Nevada, USA)
> CROW SPRINGS PROJECT (Nevada, USA)

 

 
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