The gold contained in the residue or intermediate product is leached using bivalent copper and {HEAD ~ oxygen} in {TAIL ~ 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 
in
The gold contained in the residue or intermediate product is leached using bivalent copper and { HEAD ~ oxygen } in { TAIL ~ 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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