The rocks are then placed inside a homemade filter fashioned out of discarded oil drums. Then, a cyanide sodium solution is added to the rocks to extract the gold.
Containers are then used to collect the gold cyanide solution. The solution is then forced through a container with thin zinc stripes to extract the residual zinc as well as gold.
Some mercury is used to "cook" the gold. The mercury will amalgate with the gold sludge during this process which is done over a small fire. Pure gold of 99.99 per cent is produced once the mercury evaporates from the amalgam.
Ah Chong doesn't allow his family members to stick around when he is "cooking" the gold as mercury fumes are toxic.
http://www.nst.com.my/nation/general/spotlight-doing-it-for-the-money-and-freedom-1.71855
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