{HEAD ~ The invention} relates to {TAIL ~ a method} for 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 
relates to
{ HEAD ~ The invention } relates to { TAIL ~ a method } for 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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