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2. 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.

3. Garfield Refining - Wikipedia

   en.wikipedia.org/wiki/Garfield_Refining

   Garfield Refining is a Philadelphia, Pennsylvania based refinery specializing in the purchase of precious metal, including gold, silver, platinum and palladium. The company was founded in 1892 and was originally called Eastern Smelting. [1] In 1928, it was purchased by the Garfield family.

4. 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.

5. Gold mining in the United States - Wikipedia

   en.wikipedia.org/wiki/Gold_mining_in_the_United...

   Gold was found by James Marshall at Sutters Mill, property of John Sutter, in present-day Coloma. In 1849, people started hearing about the gold and after just a few years San Francisco's population increased to thousands. Gold production in California peaked in 1852, at 3.9 million troy ounces (121 tonnes) produced in that year. But the placer ...

6. 171-191 South High Street - Wikipedia

   en.wikipedia.org/wiki/171-191_South_High_Street

   171–191 South High Street is a pair of historic buildings in Downtown Columbus, Ohio.The commercial structures have seen a wide variety of retail and service uses through the 20th century, including shoe stores, groceries, opticians, hatters, jewelers, a liquor store, and a car dealership.

7. AOL

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   The search engine that helps you find exactly what you're looking for. Find the most relevant information, video, images, and answers from all across the Web.

8. Refining (metallurgy) - Wikipedia

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

   In one of the previous melting stages, lead was added. Gold and silver preferentially dissolved in this, thus providing a means of recovering these precious metals. To produce purer copper suitable for making copper plates or hollow-ware, further melting processes were undertaken, using charcoal as fuel. The repeated application of such fire ...

9. Argo Gold Mine and Mill - Wikipedia

   en.wikipedia.org/wiki/Argo_Gold_Mine_and_Mill

   The Argo Gold Mine and Mill is a former gold mining and milling property in Idaho Springs, Colorado, featuring an intact gold mill built at the entrance of the Argo Tunnel. The tunnel was built between 1893 and 1910 to drain the gold mines in Virginia Canyon, Gilpin Gulch, Russell Gulch , Quartz Hill, Nevadaville , and Central City and allow ...