How gold is made - history used parts procedure
Once extracted the gold is refined with one of four main processes: floatation amalgamation cyanidation or carbon-in-pulp. Each process relies on the initial grinding of the gold ore and more than one process may be used on the same batch of gold ore.
Jewelry Selling – How Gold Becomes Jewelry - Liquid Fin
Gold is processed into bullions bars once it has been extracted from the ground and these are traded for investment purposes or are sold to jewelry makers the world over.
9 Step Process for Discovering Mining and Refining Gold
Crude gold is melted and treated with chloride which converts any remaining foreign metals to chloride which will then drift off the gold. The result is 99.5% pure gold which is then cast into electrodes …known as anodes where it is then placed into an electrolytic cell.
Refining Gold HowStuffWorks
Workers add borax and soda ash to the molten metal which separates the pure gold from other precious and less precious metals. A sample is then taken to a lab for tests or assays that measure the gold content. In most cases the gold is 99.9 percent pure. Workers cast the gold produced during refining into bars.
Gold processing Britannica
Exogenetic gold can also exist as oxidized ore bodies that have formed under a process called secondary enrichment in which other metallic elements and sulfides are gradually leached away leaving behind gold and insoluble oxide minerals as surface deposits.
The result of this process is 99.5 percent pure gold. The final step is to cast the gold into electrodes or anodes and place them in an electrolytic cell. The refiners will then pass an electric current through the cell. At the end of this process the gold will be 99.99 percent pure.
Gold processing - Mining and concentrating Britannica
Gold is then leached from the carbon particles by a strong solution of sodium cyanide and sodium hydroxide and it is recovered from solution by electrowinning directly onto steel wool or by the Merrill-Crowe process.
Processing smelting and refining gold World Gold Council
The two gold refining methods most commonly employed to derive pure gold are: the Miller process and the Wohlwill process. The Miller process uses gaseous chlorine to extract impurities when gold is at melting point; impurities separate into a layer on the surface of the molten purified gold.
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