cyanide consumption in gold mining

It is the most common and efficient method of extracting gold especially for lowgrade ore The process involves treating the ore with an aqueous solution of sodium cyanide About 90 of today’s

How is cyanide used in mining A sodium cyanide solution is commonly used to leach gold from ore There are two types of leaching Heap leaching In the open cyanide solution is sprayed over huge heaps of crushed ore spread atop giant collection pads The cyanide dissolves the gold from the ore into the solution as it trickles through the heap

The cyanide then dissolves gold and silver from the ore and forms a stable metalcyanide complex The use of oxygen or peroxygen compounds instead of air as an oxidant increases the leach rate and decreases cyanide consumption due to the inactivation of some of the cyanide consuming species present in the slurry

The consumption of cyanide during processing operations is a major economic cost in the extraction of gold from its ores while the discharge of cyanide wastes may result in significant environmental pollution Many factors influence the levels of consumption and discharge of cyanide including ore mineralogy and lixiviant solution chemistry

Mar 07 2016 · According to the ICMC the amount of cyanide used in commercial gold operations is typically in the range of 001 and 005 cyanide 100 to 500 parts per million and the codes website states that no accidental human deaths due to cyanide poisoning have been documented by the Australian and North American mining industries for over 100 years

Oct 20 2014 · Much simpler and less expensive gravity methods are available to recover this gold Cyanidation is used for gold that is distributed finely through a mineral matrix Liberation Cyanide leaching will only be effective if the cyanide can come in contact with the gold particle For this to happen the ore should either be sufficiently porous for cyanide to reach the gold or more usually the ore is

And today over 115 years later most of the worlds gold is recovered with cyanide playing a large part in the beneficiation of the yellow precious metal Chemically it is a rather simple reaction 4 Au 8NaCN O2 2 H2O 4 NaAuCN2 4 NaOH That presumes that the only elements are the gold Sodium Cyanide and water

The reactions that take place during the dissolution of gold in cyanide solutions under normal conditions have been fairly definitely established Most agree that the overall cyanide equation for leaching and cyanidation of gold is as follows 4 Au 8 NaCN O2 2 H20 4 NaAuCN2 4 NaOH

15 reduction in cyanide consumption Realtime cyanide monitoring empowers mining operators with reliable data that allows them to find the right amount of cyanide needed for gold leaching 2 increase in

34 Cyanide Consumption in Uranium Mining The use of cyanide in gold mining is a major environmental risk that needs to be proactively managed Major tailings dam failures in the past decade have led to considerable public scrutiny of cyanide although at