Bacterial oxidation of a low-grade sulfide gold ore was investigated in order to enhance leaching of gold. The experiments were carried out in columns using mixed cultures of thiobacillus ferrooxidans isolated from the ore. Fractions with different screen analyses were oxidized in two regimes--one pass of the solution and circulating solution. Constant temperature and flow rate of the percolating solution were maintained during the experiments. A correlation between the concentrations of copper and iron in the solution leaving the columns and ph and eh values was observed. The effect of bacterial activity was proved by means of thiourea and cyanide leaching of the oxidized ore.
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