The system H2SO4-K2Cr2O7 is examined for leaching copper, zinc and iron from the copper smelter slag. The presence of dichromate has a positive effect on the copper recovery, which reaches 68 % under the following conditions: 0.5 M K2Cr2O7 + 1 M H2SO4, solid-to-liquid ratio = 15 g: 1 L, 120 min, 298 K. The calculated values of Ea of Cu recovery amounts to 34.60 kJ/mol, that of Zn – to 43.96 kJ/mol, while that of Fe - to 44.33 kJ/mol. The recovery of zinc and iron decreases significantly with the presence of K2Cr2O7 and is only 4 % - 5 % under the conditions specified. This fact can be associated with the selective adsorption of dichromate ions on the surface of the minerals containing zinc and iron. It prevents the recovery of these metals into the solution. This circumstance can be used... to separate copper from zinc and iron during the leaching process. About 68 % - 70 % of the copper present can be recovered during the first stage; the leaching residue can be used for further extraction of zinc.