The invention relates to {HEAD ~ a method} for {TAIL ~ the recovery} of gold in connection with the hydrometallurgical production of copper from a residue or intermediate product containing sulphur and iron generated in the leaching of copper raw material 
for
The invention relates to { HEAD ~ a method } for { TAIL ~ the recovery } of gold in connection with the hydrometallurgical production of copper from a residue or intermediate product containing sulphur and iron generated in the leaching of copper raw material
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