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