The gold contained in the residue or intermediate product is leached using {HEAD ~ bivalent copper} and {TAIL ~ oxygen} in copper chloride sodium chloride solution in the conditions, where the oxidation reduction potential is a maximum of 650 mV and the pH at least 1 
The gold contained in the residue or intermediate product is leached using { HEAD ~ bivalent copper } and { TAIL ~ oxygen } in copper chloride sodium chloride solution in the conditions , where the oxidation reduction potential is a maximum of 650 mV and the pH at least 1
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