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75 Gold Recovery Methods

Cyanide leaching has been used to recover gold since the 1890s but only since the 1960s with the advent of heap leaching has cyanide become the method-of-choice for leaching gold from milled hardrock, and has potential for leaching gold from placer concentrates.
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Non-cyanide gold recovery and biological treatment of acid mine drainage by Kemetco Research – Clean Mining Alliance

Kemetco Research is developing a cyanide-free extraction method that would remove the harmful chemical compound from gold processing, thereby creating a safer and more environmentally friendly process for gold extraction and processing.
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Cyanide process – Wikipedia

Production of reagents for mineral processing to recover gold, copper, zinc and silver represents approximately 13% of cyanide consumption globally, with the remaining 87% of cyanide used in other industrial processes such as plastics, adhesives, and pesticides.
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Contact Information – SEMAFO – Over 95% Gold Recovery at Siou in Both Oxide and Sulphide Rock

Lixiviation parameters used to conduct the tests were similar to those used in Mana's CIL process (grind, cyanide consumptions, pH etc.).
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YES TECHNOLOGIES – Cyanide-free biocatalyzed leaching of gold and silver ore

Process which uses microorganisms for the recovery of precious metals from metal-containing processes and streams. This technology is targeted at using naturally-occurring, sulfate-reducing bacteria for the recovery of gold and silver from ores, instead of the more traditional — and more toxic — cyanidation process.
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Use in Mining – International Cyanide Management Code (ICMI) For The Manufacture, Transport and Use of …

This document provides a general overview of the use of cyanide in the gold recovery process, and is not intended to be a technical reference on the use of cyanide to recover gold.
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Patent US4372830 – Recovery of gold in gold plating processes – Google Patents

A process involving the use of gold in the form of gold cyanide ion dissolved in aqueous solution where gold cyanide ion is recovered from at least a portion of the aqueous solution by absorption on an anion-exchange resin and the gold is removed from the resin using an eluent characterized in that the eluent comprises…
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post gold mining cyanide

One promising alternative to using cyanide in gold mines is the Haber Gold Process, a non-toxic extraction system that tests have shown can result in more gold recovery over a shorter period than cyanidation.
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Cyanide Leaching Of Gold

Once the gold has been dissolved in the cyanide, and the ore body has been reasonably depleted of its gold, there are two main processes for recovering the gold from the pregnant cyanide solution. Since the 1890's, cyanide has been used to recover gold from gold bearing ores.
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