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  2. Borax method - Wikipedia

    en.wikipedia.org/wiki/Borax_method

    Borax is a crystal-forming mineral that can be reduced to a powder, in this case for use as a flux. The borax method is a technique of artisanal gold mining, which uses borax as a flux to purify gold concentrates. By using borax, no mercury flour is produced, hence gold recovery increases. [1] [2]

  3. Gold parting - Wikipedia

    en.wikipedia.org/wiki/Gold_parting

    Gold parting is the separating of gold from silver (and other metallic impurities). Gold and silver are often extracted from the same ores and are chemically similar and therefore difficult to separate. The alloy of gold and silver is called electrum. [1]

  4. Gold extraction - Wikipedia

    en.wikipedia.org/wiki/Gold_extraction

    Gold occurs principally as a native metal, i.e., gold itself.Sometimes it is alloyed to a greater or lesser extent with silver, which is called electrum.Native gold can occur as sizeable nuggets, as fine grains or flakes in alluvial deposits, or as grains or microscopic particles (known as colour) embedded in rock minerals.

  5. Cupellation - Wikipedia

    en.wikipedia.org/wiki/Cupellation

    16th century cupellation furnaces (per Agricola). Cupellation is a refining process in metallurgy in which ores or alloyed metals are treated under very high temperatures and subjected to controlled operations to separate noble metals, like gold and silver, from base metals, like lead, copper, zinc, arsenic, antimony, or bismuth, present in the ore.

  6. List of alchemical substances - Wikipedia

    en.wikipedia.org/wiki/List_of_alchemical_substances

    Fulminating gold – a number of gold based explosives which "fulminate", or detonate easily. – gold hydrazide, formed by adding ammonia to the auric hydroxide. When dry, can explode on concussion. – an unstable gold carbonate formed by precipitation by potash from gold dissolved in aqua regia. Galena – lead(II) sulfide. Lead ore.

  7. Own a pool in Southern California? New air-quality rule ...

    www.aol.com/news/own-pool-southern-california...

    The landmark rule from South Coast AQMD would phase out more than 1 million natural gas-powered appliances, including those that heat swimming pools and hot tubs, and require them to be replaced ...

  8. How To Use Borax In Laundry For Fresher, Brighter Clothes - AOL

    www.aol.com/borax-laundry-fresher-brighter...

    For the times you don't have to brighten your clothes or pre-treat stains, and you just want to use borax for it's magical washing power, all you need is to add 1/2 cup of borax to your load on ...

  9. Aqua regia - Wikipedia

    en.wikipedia.org/wiki/Aqua_regia

    The reaction with hydrochloric acid is an equilibrium reaction that favors formation of tetrachloroaurate(III) anions. This results in a removal of gold ions from solution and allows further oxidation of gold to take place. The gold dissolves to become chloroauric acid. In addition, gold may be dissolved by the chlorine present in aqua regia.

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