The biggest health concern with the use of cyanide in mining is the effect that it can have if it leaches into surface water. Fish are said to be over a thousand times more sensitive to cyanide than humans are, and pollution can have a detrimental effect on native ecosystems if used improperly.
Therefore, a reasonable amount of scrutiny of this process to ensure proper use of this chemical is certainly justified. How the Extraction Process Works.
It is also usually done in conjunction with a process such as grinding, milling or a gravity separation that increases the surface area of the ore to expose as much gold as possible; this is done because the sodium cyanide solution has no effect on the gold during the extraction process if it does not come into direct contact with the gold particles.
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