East Archimedes, Ruby Hill

Nevada, USA

Main commodities: Au
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The East Archimedes Carlin style gold resource is located at Ruby Hills approximately 140 km south of Carlin and 2 km NW of Eureka, in Eureka County, Nevada, USA. It is on the southern end of the Battle Mountain - Eureka gold trend.

East Archimedes deposit is a deeper continuation of the Ruby Hills deposit which was mined by open pit mine and exhausted at the end of 2002. An open-pit, heap leach operation exploits the East Archimedes deposit, which is a deeper continuation of the ore mined previously at Ruby Hill.

Mineralisation is Tertiary age and hosted by Upper Cambrian to Lower Ordovician miogeoclinal rocks which are dominantly impure fine-grained carbonates (wackestones and mudstones), with lesser, but significant silty to shaly limestone units.

The mineralisation occurs within a gold-bearing brecciated jasperoid and decalcified limestone overlain by a 15 to 122m thick layer of cemented alluvium and gravel.

Parts of the deposit have been exposed by post-mineral uplift, producing a relatively deep level of oxidation with only minor sulphides at depth. Subsequent Basin and Range faulting resulted in reburial of the mineralised system beneath up to 150 m of Tertiary-Quaternary overburden (Barrick Gold, 2006).

Published reserve figures include:

  17.4 Mt @ 1.81 g/Au = 31.4 t Au (Proven+probable reserve, December, 2005, Barrick, 2006).
  3.11 Mt @ 1.86 g/Au = 5.8 t Au (Measured+indicated+inferred resource, Dec., 2005, Barrick, 2006).

The most recent source geological information used to prepare this summary was dated: 2006.    
This description is a summary from published sources, the chief of which are listed below.
© Copyright Porter GeoConsultancy Pty Ltd.   Unauthorised copying, reproduction, storage or dissemination prohibited.

  References & Additional Information

Porter GeoConsultancy Pty Ltd (PorterGeo) provides access to this database at no charge.   It is largely based on scientific papers and reports in the public domain, and was current when the sources consulted were published.   While PorterGeo endeavour to ensure the information was accurate at the time of compilation and subsequent updating, PorterGeo takes no responsibility what-so-ever for inaccurate or out of date data, information or interpretations.

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