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Retorted precious metal sludge is refined in an electric induction furnace producing doré bullion. Mercury contained in the ore and reporting to solution during cyanidation is recovered in a mercury scrubber, or from the retort condenser. Metals deposited on stainless steel mesh cathodes are water-flushed to a wash box and filtered in a plate and frame filter press prior to retorting. Loaded eluate from pressure stripping reports to two electrowinning cells. Loaded carbon is transferred to a nitric acid wash column for washing and neutralisation prior to pressure stripping. Heap-leach pregnant solution is combined with outflow from the first column to feed the remainder of the adsorption circuit. Thickener overflow and belt filtration solutions are combined to feed the first column. Seven carbon adsorption columns are arranged in series. The projected heap-leach extraction rate is 80% after 30 days. Low-grade ore and belt filter cake are combined with cement and barren solution to produce agglomerates at 12% moisture for heap leaching. Thickener overflow and belt filter filtrate and wash solutions are combined at around 2.4g/t Au to feed the first carbon adsorption column. Gold dissolved in the leach tank is separated and washed from the filter cake during filtration. Grinding in cyanide, using recycled, heap-leach barren solution and cement for pH control, results in approximately 60% dissolution of gold values reporting to thickener overflow. Leached slurry is filtered to produce filter cake of less than 25% moisture and a high-grade gold solution for carbon adsorption.
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Cyclone overflow is thickened to 55% solids and leached in a single, air sparged, mechanically agitated leach tank. The tertiary crusher product returns to the stockpile for re-screening, while screen undersize is transferred to a 1,360t fine ore silo.Ĭrushed fine ore is ground in a ball mill in closed circuit with a hydrocyclone. Screen oversize is fed to a Nordberg 1560 Omnicone shorthead crusher. Tertiary screening and crushing is operated in closed circuit with high-grade ore fed to a double-deck screen. Secondary screen oversize is fed to a Nordberg 1560 Omnicone standard head crusher while undersize and secondary crusher product are transferred stockpiles. Grizzly undersize and jaw crusher product are combined and fed to open circuit secondary screening and crushing. Oversize is fed to a primary jaw crusher. The recovery plant had a design capacity of 3,175t/d, comprised of 2,358t of low-grade ore crushed in two stages to –19mm and 816t of high-grade ore crushed in three stages to –13mm for milling.Ī variable speed apron feeder pulls run-of-mine ore from a dump hopper to a vibrating grizzly. Before the mine was closed in 2002, high grade ore was processed in a conventional mill and leach plant. Ore explored from the mine is processed on-site by zero-discharge heap leach and carbon column facilities. The overall stripping ratio was estimated at 7.2:1.
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The open pit was mined before closure using Caterpillar 777D 91t-capacity haul trucks and a Cat 992G wheel loader. As of 31 December, 2008, the mine held 831,000oz of proven and probable mineral reserves/gold. The West Archimedes orebody consists of gold-bearing brecciated jasperoid and decalcified limestone overlain by a layer of cemented alluvium and gravel from 15m to 122m thick. In 2008, the mine produced 98,000oz of gold. The decision to reopen and explore the EastĪrchimedes gold ore body, found below the original open pit towards the east, was taken the same year The mine poured its first gold in 2007. Operations at the mine restarted in 2003 following an investment of $75m, including $30m in mining equipment and processing upgrades. In 2001, it produced 134,747oz of gold, but was closed during 2002 following the exhaustion of mineable reserves. Formerly wholly owned by Homestake Mining, the property passed to Barrick Gold Corp. At Forest Junctioin, take Plilocene Ridge Road (CR S309) to Galloway Road N toward Downieville, then Forest Road 30W toward mine, 4WD advised.Ruby Hill is an open-pit gold mine and ore processing facility, located 2km north-west of Eureka and 386km east of Reno, Nevada. I80E to Hwy 49N through Nevada City to Ridge Road (toward Allegheny).