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dc.contributor.authorGentina, J.es_ES
dc.contributor.authorAguirre Chamba, P.es_ES
dc.contributor.authorGordillo, F.es_ES
dc.contributor.authorDonati, E.es_ES
dc.contributor.authorSanmartin Gutierrez, V.es_ES
dc.contributor.authorSuarez Chacon, J.es_ES
dc.identifier.issn0878493220; 9780878493227es_ES
dc.description.abstractThe mining district of Zaruma-Portovelo of southern Ecuador is a deposit of polymetallic sulfides worked since 1908. Currently the small traditional mining operation processes 1800 tons of ore a day, generating environmental waste that is accumulated and systematically discharged into the Calera and Amarillo Rivers. In this watershed area of Puyango-Tumbes, where samples were taken and subjected to gravimetric concentration, a mineralogical analysis of the concentrate was made. Samples of sediments taken from areas of weathered mining shafts were used to isolate native microorganisms for subsequent molecular and physiological characterization. The mineral concentrate contains 66.63 % of pyrite, 175 ppm Ag and 6.9 ppm Au (with 80 % of refractory gold). This mineral was subjected to biooxidation by the isolated native organisms. In experiments with pulp density of 10%, the solubility of the sulfides was very significant, reaching concentrations of Fe3 + 30 g/L and sulfate 60 g/L. © (2009) Trans Tech Publications.es_ES
dc.subject16s rrnaes_ES
dc.subjectpolymetallic tailses_ES
dc.titleMineralogical characterization of a polymetallic concentrate Portovelo mining district. Bioleaching by a native bacterial consortiumes_ES
dc.publisherAdvanced Materials Researches_ES
Appears in Collections:Artículos de revistas Científicas

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