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and processing gold ore

The Millerprocessuses gaseous chlorine to extract impurities whengoldis at melting point; impurities separate into a layer on the surface of the molten purifiedgold.The Millerprocessis rapid and simple, but it producesgoldof only about 99.5 percent purity. The Wohlwillprocessincreases purity to about 99.99 percent by electrolysis.

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