File:Cyanide leaching of low grade gold ore rock piles (above Squaw Gulch, Cripple Creek Mining District, Colorado, USA) 2.jpg
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English: The rock pile at the very top-right of the photo is low-grade gold ore in central Colorado's Cripple Creek Mining District. Modern acquisition of gold involves open-pit mining, crushing of rock, and depositing the material in huge piles atop leach pads. The rock piles are then sprayed with sodium cyanide, a chemical that dissolves gold. This process is called cyanide heap leaching.
Cyanide leachate is recovered from the bottom of the rock piles and sent to a precipitation plant. There, the chemical solution is passed through burned coconut shells, a carbon-rich material that has a high surface area. Gold gets adsorbed onto the carbon. After that, the cyanide is recycled (but more is added to it). Very low grade ore can be successfully processed using this method. Rocks with gold contents down to about 1 parts per million Au can be cyanide leached. Locality: view from above Squaw Gulch, Cripple Creek Mining District, southern Teller County, central Colorado, USA |
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| Source | https://www.flickr.com/photos/47445767@N05/49241836787/ |
| Author | James St. John |
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This image was originally posted to Flickr by James St. John at https://flickr.com/photos/47445767@N05/49241836787 (archive). It was reviewed on 15 January 2020 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0. |
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
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| current | 17:54, 15 January 2020 | | 3,008 × 1,503 (4.93 MB) | Ser Amantio di Nicolao (talk | contribs) | User created page with UploadWizard |
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