Leaching of gold from its ores using cyanide has been employed for well over a century Addition of cyanide converts the gold into a cyanide complex (Au(CN) 2 -) that is soluble in water (Wang and Forssberg, 1990). The leaching reaction can be represented as Equation [1]: 4 Au + 8 NaCN + O 2 + 2H 2 O [1] 4 Na[Au(CN) 2 ] + 4 NaOH
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Fungene et al. (2018) studied this question.
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