Por: Gonzalo Larrabure y Juan Carlos F. Rodríguez-Reyes*, Departamento de Ingeniería Química, Universidad de Ingeniería & Tecnología – UTEC.AbstractWaste reutilization schemes are key to ensure complete sustainability in mineral processing. This article explores the possibility of using acid mine drainages and hydrogen peroxide to conduct an oxidative acid pretreatment of silver-containing polymetallic sulfides, expecting a better response of the minerals in a subsequent cyanidation. Additionally, the use of sulfuric acid pretreatments with hydrogen peroxide is explored for comparative purposes, finding considerable similarity in the results using commercial acid or acid mine drainages. Samples exposed to the oxidative acid pretreatment consumed lower amounts of cyanide during the subsequent leaching, because such pretreatment allows for the removal of soluble copper species. Although the use of any of the pretreatments does not alter the final silver extraction, it does accelerate the kinetics of leaching. Considering the need to develop sustainable mineral processing schemes, this work opens the possibility of simultaneously carrying out processes for removing cyanicidal metals in a mineral sample and reducing the acidity of acid drainages.