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It is well known that galvanic interactions between sphalerite or pyrite and manganese (IV) oxide(MnO2) accelerate the leaching of these minerals. Because MnO2 is nobler than chalcopyrite, chalcopyrite acts as cathode to be oxidized in contact with MnO2. We investigated the feasibility of galvanic leaching of chalcopyrite concentrate using chemical reagent MnO2. Leaching experiments were performed...