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  2. 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.

  3. Gold extraction - Wikipedia

    en.wikipedia.org/wiki/Gold_extraction

    High-grade gold ore from a quartz vein near Alma, Colorado. The appearance is typical of very good gold-quartz ore. 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.

  4. GFS Chemicals - Wikipedia

    en.wikipedia.org/wiki/GFS_Chemicals

    Located on River Street Columbus, OH, the Organic manufacturing facility as a location is a relatively new facility. GFS has always performed organic chemistries, however after the acquisition period more space was needed to further develop the business and to explore the future scientific opportunities which could be advanced.

  5. Scientists find way to make gold from electronic waste

    www.aol.com/news/scientists-way-gold-electronic...

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  6. Why gold at Costco is a terrible investment and what to buy ...

    www.aol.com/finance/why-gold-costco-terrible...

    Plus, we’ll talk about the best way to buy gold. 3 reasons why Costco’s gold is a bad investment. Costco is selling gold ingots – two types actually – priced at $2,070 (as of mid-December

  7. Costco Now Sells Gold Bars: Here's How to Buy Them

    www.aol.com/costco-now-sells-gold-bars-160000656...

    The exact gold bars that Costco offers are 1 ounce gold PAMP Suisse Lady Fortuna Versican bars. The one-ounce bars go for just under $2,000, depending on the time of purchase, according to ...

  8. Electrowinning - Wikipedia

    en.wikipedia.org/wiki/Electrowinning

    Apparatus for electrolytic refining of copper. Most metal ores contain metals of interest (e.g. gold, copper, nickel) in some oxidized states and thus the goal of most metallurgical operations is to chemically reduce them to their pure metallic form. The question is how to convert highly impure metal ores into purified bulk metals.

  9. 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 ...