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Newmont’s Waihi Gold Mine in New Zealand uses H2O2 method to destroy cyanide in the form of free cyanide and WAD (as Cu, Ni, Zn complexes), existed in effluents resulting from gold and silver extraction (Waihigold, 2013). Copper sulphate is added to the process as a catalyst to speed up the reaction. The cyanide destruction process is followed by a metal and trace ion removal process using ferric chloride, lime and flocculants. The treatment plant built in1999 was recently upgraded incorporating a reverse osmosis process to produce high quality water that can be discharged to the Ohinemuri River.
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