The approach used most commonly to prevent pyrite oxidation in the field is the use of limestone. This approach, however, has a short span of effectiveness because the pyrite particle surfaces remain exposed to the atmospheric O2after treatment. The objective of this study was to examine the feasibility of controlling pyrite oxidation in bench-scale studies by creating a ferric hydroxide-silica coating that would prevent either O2or Fe3+from oxidizing pyrite further. Ferric hydroxide-silica coating formation involved leaching pyrite at room temperature using a 10-mm-i.d. chromatographic column with a solution containing H2O2, Na-acetate (NaOAC), and soluble silicate at a flow rate of 0.43 mL min−1. The results of this bench-scale study show that formation of a ferric hydroxide-silica coating was induced on the pyrite surface and that it inhibited pyrite oxidation under acid conditions.