Decades of mining activities in Chile have generated large amounts of solid waste, which have been deposited in mine tailing impoundments. These impoundments cause concern due to dam failures or natural leaching to groundwater and rivers. This work shows the laboratory results of 11 electrodialytic remediation experiments on copper mine tailings with the addition of sulphuric and citric acid. Comparing this to electrodialytic remediation with watery tailing, both acids enhanced the process. However, with citric acid addition the process was further enhanced because besides the pH decrease a formation of copper citrate complexes occurred. The maximum copper removal reached in the anode side of the remediation cell was 53% with sulphuric acid in 504h and 35% with citric acid in only 40h, both experiments at 20 V treating approximately 1.7 kg mine tailing on dry basis.