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  2. Gold extraction - Wikipedia

    en.wikipedia.org/wiki/Gold_extraction

    A "refractory" gold ore is an ore that has ultra-fine gold particles disseminated throughout its gold occluded minerals. These ores are naturally resistant to recovery by standard cyanidation and carbon adsorption processes. These refractory ores require pre-treatment in order for cyanidation to be effective in recovery of the gold. A ...

  3. Pressure oxidation - Wikipedia

    en.wikipedia.org/wiki/Pressure_oxidation

    Pressure oxidation is a process for extracting gold from refractory ore. The most common refractory ores are pyrite and arsenopyrite, which are sulfide ores that trap the gold within them. Refractory ores require pre-treatment before the gold can be adequately extracted. [1] The pressure oxidation process is used to prepare such ores for ...

  4. Bacterial oxidation - Wikipedia

    en.wikipedia.org/wiki/Bacterial_oxidation

    The BIOX® process is a proprietary technology owned by Biomin South Africa and used under licence by a number of operating mines. The BIOX® process involves bacterial oxidation in agitated tanks for pre-treatment of refractory ores and concentrates ahead of conventional cyanide leach for gold recovery.

  5. Getchell Mine - Wikipedia

    en.wikipedia.org/wiki/Getchell_Mine

    The refractory gold ore is treated by pressure oxidation technology at the Twin Creeks Sage autoclave and gold recovered using conventional carbon-in-leach technology. [2] [4] The gold deposit is a sediment-hosted disseminated Carlin–type deposit, with sub-micron sized gold distributed in pyrite and marcasite. [1]

  6. Wiluna Gold Mine - Wikipedia

    en.wikipedia.org/wiki/Wiluna_Gold_Mine

    Wiluna Mines installed a Biox processing plant, which is a pretreatment process for refractory gold ores or concentrates, using naturally occurring bacteria to break down the sulphide ore and liberate the gold for subsequent cyanidation. The advantage of the Biox process is its environmental friendliness, whereas disadvantages include the ...

  7. Albion process - Wikipedia

    en.wikipedia.org/wiki/Albion_process

    The Albion process is an atmospheric leaching process for processing zinc concentrate, refractory copper and refractory gold. [1] The process is important because it is the most cost-effective method currently in use for extracting both the zinc and lead from concentrates that contain high lead levels (7% or greater).

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  9. Black Hills gold rush - Wikipedia

    en.wikipedia.org/wiki/Black_Hills_Gold_Rush

    In these conditions, gold was chemically bound to the rock, and very difficult to remove. It was called refractory gold ore. For many years, the Homestake operated as the only major gold mine in the Black Hills. Chlorization and smelting were seen as two methods that could remove gold from the refractory ore in the 1890s.