Sancho, J. P., Fernández, B., Ayala, J., García, M. P., & Lavandeira, A. (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), 224–233. https://doi.org/10.3989/revmetalm.1029