Sancho, J. P., B. Fernández, J. Ayala, M. P. García, and A. Lavandeira. 2011. “Uses of the Potassium Permanganate to Eliminate Copper Cyanide from Waste Water Resulting from a Lixiviation Plant in a Gold Mine (II): Pilot Plant Experiences”. Revista De Metalurgia 47 (3):224-33. https://doi.org/10.3989/revmetalm.1029.