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2. Wohlwill process - Wikipedia

   en.wikipedia.org/wiki/Wohlwill_process

   The resulting gold is 99.999% pure, and of higher purity than gold produced by the other common refining method, the Miller process, which produces gold of 99.5% purity. [1] [2] [3] For industrial gold production the Wohlwill process is necessary for highest purity gold applications.

3. Gold parting - Wikipedia

   en.wikipedia.org/wiki/Gold_parting

   The very earliest attempts at refining gold can be shown by the surface enhancement of gold rings. Gold quality was increased at the surface by 80–95% gold compared to 64–75% gold at the interior found in Nahal Qanah Cave dated to the 4th millennium BC.

4. Miller process - Wikipedia

   en.wikipedia.org/wiki/Miller_process

   The resulting gold is 99.5% pure, but of lower purity than gold produced by the other common refining method, the Wohlwill process, which produces gold of up to 99.999% purity. [1] [2] The Wohlwill process is commonly used for producing high-purity gold, such as in electronics work, where exacting standards of purity are required.

5. Refining (metallurgy) - Wikipedia

   en.wikipedia.org/wiki/Refining_(metallurgy)

   In metallurgy, refining consists of purifying an impure metal. It is to be distinguished from other processes such as smelting and calcining in that those two involve a chemical change to the raw material, whereas in refining the final material is chemically identical to the raw material. Refining thus increases the purity of the raw material ...

6. India's army of gold refiners face new competition

   www.aol.com/indias-army-gold-refiners-face...

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7. Gold extraction - Wikipedia

   en.wikipedia.org/wiki/Gold_extraction

   The gold may then be further refined by gold parting, which removes other metals (principally silver) by blowing chlorine gas through the molten metal. Historically, small particles of gold were amalgamated with mercury, and then concentrated by boiling away the mercury. The mercury method is still used in some small operations.