Bio-oxidation of arsenic-bearing gold concentrate is generally slow and prone to passivation. To alleviate this concern, it pivotal explore the possible catalysts reduce passivation during bio-oxidation. In present work, enhancing effects Ag+, ethylenediamine tetraacetic acid (EDTA) oxalate (Ox) on bio-oxidation mechanisms were investigated by leaching experiments, thermodynamic calculation, XR...