For extracting gold from lowgrade ores, heap leaching is practiced; huge heaps are sprayed with a dilute solution of sodium cyanide, and this percolates down through the piled ore, dissolving the gold. There are very well defined rules for the safe and responsible use of cyanide – as laid out in the International Cyanide Code. Gold refining
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Gold is usually found alone or alloyed with mercury or silver, but can also be found in ores such as calaverite, sylvanite, nagyagite, petzite and krennerite. Most gold ore now comes from either open pit or underground mines. The ores sometimes contain as little as 5/100 of an ounce of gold .
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May 19, 2009· This process, called cyanide milling, is fairly efficient – recovering 95% to 98% of gold from the ore. It can be done economically using ore with less than one gram of gold per ton (depending, of course on the Gold Price). When lowercost extraction is needed, heap leaching is used.
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