Due to its simplicity and efficiency, the cyanidation process for the extraction of gold from ore has been employed for about 128 years since MacArthur's work in 1887 was applied commercially. However, the cyanidation process generates a large amount of cyanide and copper containing gold mine effluents. Many countries and environmental protection agencies have imposed limiting standards for the discharge of cyanide-contaminated effluent. The treatment (removal or recovery) of cyanide and copper from gold mi...