enow.com Web Search

Search results

  1. Results from the WOW.Com Content Network
  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. Arsenopyrite - Wikipedia

    en.wikipedia.org/wiki/Arsenopyrite

    Consequently, it serves as an indicator of gold bearing reefs. Many arsenopyrite gold ores are refractory , i.e. the gold is not easily cyanide leached from the mineral matrix. Arsenopyrite is found in high temperature hydrothermal veins, in pegmatites , and in areas of contact metamorphism or metasomatism .

  4. 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 ...

  5. 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 ...

  6. 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.

  7. Refractory - Wikipedia

    en.wikipedia.org/wiki/Refractory

    Refractory bricks in a torpedo car used for hauling molten iron. In materials science, a refractory (or refractory material) is a material that is resistant to decomposition by heat or chemical attack and that retains its strength and rigidity at high temperatures. [1]

  8. 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.

  9. Gold mining - Wikipedia

    en.wikipedia.org/wiki/Gold_mining

    Gold mining produces more waste than mining of other minerals, because it can be mined at a lower grade. Tailings can contain lead, mercury, cadmium, and arsenic. These toxins can pose health risks for local communities. [86] Arsenic is typically found in gold-containing ores, and gold processing may contaminate groundwater or the