The gold crusher was then washed over copper plates that had been treated with cyanide and tinned with ��quick-silver�� (mercury). Mercury has a chemical affinity to gold, hence catches it. The resulting putty like mixture was then scraped off the copper plate placed into a crucible and heated to evaporate the mercury until only the gold remained. Sometimes retorts were placed over the crucible to recycle the toxic mercury and cyanide. This method of extraction was used for many years although it was generally accepted that it was only 60% effective.
gold ore processing plant A dilute cyanide-water solution is pumped through the series of plastic hose with sprays or drip emitters placed throughout the pile, and solution runs through the leach, dissolving gold. Pregnant solution (gold bearing solution) runs from the pile in the drainage pipes or ditches, and is collected in a series of ponds. The leach area is lined with several impermeable liners, primary and secondary liners, to prevent the possibility of any solution escaping into the ground. Monitoring wells are stratagically placed and continuously monitored to be certain that no leakage has occurred. aggregate crusher
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