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heap leaching |
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heap leaching [′hēp ‚lēch·iŋ] (metallurgy) A process used for the recovery of copper from weathered ore and material from mine dumps; material is laid to a thickness of 20 feet (6 meters) in alternately fine and coarse beds and treated with water at intervals during which oxidation occurs; liquor that runs off is treated with scrap iron to precipitate copper. How to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit webmaster's page for free fun content. |
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There have been some notable green victories: Montana has banned the use of cyanide heap leaching (effectively killing the industry there), California has introduced prohibitively strict water-use rules, and activists in Washington recently blocked the proposed Crown Jewel mine. 4,000 ounces of gold and 250,000 ounces of silver are contained in already mined mineralized material and is awaiting the start of a heap leaching operation. Metcon further reported that: (i) heap leaching of material at a minus 3/4 inch crush size will enhance gold recovery; (ii) coarse gold does not appear to be a problem; (iii) gold liberation (crushing) is needed to increase gold recovery; (iv) the presence of copper does not appear to be a problem in the leach; and (v) silver contained in these materials does not appear to be very soluble. |
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