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East Archimedes, Ruby Hill |
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Nevada, USA |
| Main commodities:
Au
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Super Porphyry Cu and Au
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IOCG Deposits - 70 papers
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All papers now Open Access.
Available as Full Text for direct download or on request. |
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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 decription 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.
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