gold extracting from pyritic containing gold ore

pictures of how gold extracted from ore - tobien Most gold ore now comes from either open pit or underground mines. The ores sometimes contain as little as 5/100 of an ounce of gold per ton of rock. YES TECHNOLOGIES: Cyanide-free biocatalyzed leaching of ... Description: Process which uses microorganisms for the recovery of precious metals from metal-containing processes and streams. This technology is targeted at using naturally-occurring, sulfate-reducing bacteria for the recovery of gold and silver from ores, instead of the more traditional -- and more toxic -- cyanidation process. which stone contains gold - crusherasia In Colorado the pyritic ores containing gold and silver in association with copper are smelted in ... Gold Extraction - Gold Mining - Washing, Amalgamation, ...    Read More