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  2. Gold mining - Wikipedia

    en.wikipedia.org/wiki/Gold_mining

    Gold mining can significantly alter the natural environment. Gold mining activities in tropical forests are increasingly causing deforestation along rivers and in remote areas rich in biodiversity. [77] [78] Mining has increased rainforest loss up to 70km beyond lease boundaries, causing nearly 11,670 km 2 of deforestation between 2005 to 2015 ...

  3. Gold cyanidation - Wikipedia

    en.wikipedia.org/wiki/Gold_cyanidation

    Gold cyanidation (also known as the cyanide process or the MacArthur–Forrest process) is a hydrometallurgical technique for extracting gold from low-grade ore through conversion to a water-soluble coordination complex. It is the most commonly used leaching process for gold extraction. [1]

  4. Gold extraction - Wikipedia

    en.wikipedia.org/wiki/Gold_extraction

    Gold extraction is the extraction of gold from dilute ores using a combination of chemical processes. Gold mining produces about 3600 tons annually, [1] and another 300 tons is produced from recycling. [2] Since the 20th century, gold has been principally extracted in a cyanide process by leaching the ore with cyanide solution.

  5. Gold dredge - Wikipedia

    en.wikipedia.org/wiki/Gold_dredge

    Gold Dredge, Klondike River, Canada, 1915 The Yankee Fork dredge near Bonanza City, Idaho, which operated into the 1950s. A gold dredge is a placer mining machine that extracts gold from sand, gravel, and dirt using water and mechanical methods. The original gold dredges were large, multi-story machines built in the first half of the 1900s.

  6. Scientists find way to make gold from electronic waste

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

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  7. Carbon in pulp - Wikipedia

    en.wikipedia.org/wiki/Carbon_in_pulp

    Carbon in pulp (CIP) is an extraction technique for recovery of gold which has been liberated into a cyanide solution as part of the gold cyanidation process. [1]Introduced in the early 1980s, Carbon in Pulp is regarded as a simple and cheap process.

  8. Homestake Mine (South Dakota) - Wikipedia

    en.wikipedia.org/wiki/Homestake_Mine_(South_Dakota)

    By 1975, mining operations had reached the 6,800-foot (2,073 m) level, and two winzes were planned to 8,000 feet (2,438 m). [7]: 63–66, 73–74 Homestake high-grade gold ore, view is about 1.2 cm wide. The gold ore mined at Homestake was considered low grade (less than one ounce per ton), but the body of ore was large. [8]

  9. Jig concentrators - Wikipedia

    en.wikipedia.org/wiki/Jig_concentrators

    Jig concentrators are devices used mainly in the mining industry for mineral processing, to separate particles within the ore body, based on their specific gravity (relative density). [1] The particles would usually be of a similar size, often crushed and screened prior to being fed over the jig bed. There are many variations in design; however ...

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