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  2. Wilfley table - Wikipedia

    en.wikipedia.org/wiki/Wilfley_table

    The Wilfley Table became a design used world-wide due to the fact it significantly increased the recovery of silver, gold and other precious metals. [3] Such was the table's widespread use that it was included in Webster's Dictionary, [4] and has been in constant use by miners and metallurgists since its invention. [5]

  3. 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.

  4. Gold cyanidation - Wikipedia

    en.wikipedia.org/wiki/Gold_cyanidation

    Challenges include reagent cost and the efficiency of gold recovery, although some chlorination process using sodium hypochlorite (household bleach) have shown promise in terms or reagent regeneration. These technologies are at a pre-commercialisation stage and compare favourably to equivalent cyanidation methods, including gold recovery ...

  5. Pressure oxidation - Wikipedia

    en.wikipedia.org/wiki/Pressure_oxidation

    Pressure oxidation has a very high gold recovery rate, normally at least 10% higher than roasting. [ 1 ] The oxidation of the iron sulfide minerals produces sulfuric acid , soluble compounds such as ferric sulfate, and solids such as iron sulfate or jarosite .

  6. SS Central America - Wikipedia

    en.wikipedia.org/wiki/SS_Central_America

    SS Central America, known as the Ship of Gold, was a 280-foot (85 m) sidewheel steamer that operated between Central America and the East Coast of the United States during the 1850s. She was originally named the SS George Law , after George Law of New York.

  7. Knelson concentrator - Wikipedia

    en.wikipedia.org/wiki/Knelson_concentrator

    A Knelson concentrator is a type of gravity concentration apparatus, predominantly used in the gold mining industry. It is used for the recovery of fine particles of free gold, meaning gold that does not require gold cyanidation for recovery. [1]