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The analysis of the variables, bacterial population and oxidation-reduction potential (ORP) during the bioleaching of sulfide ores by a bacterial strain of Acidithiobacillus ferrooxidans, isolated from acid mine effluent, aims at the solubilization of copper and the liberation of the gold present in an ore containing more than 80% sulfides. It was studied at different pulp densities (1, 2 and 6% - W/V) and with a 9k medium at different ferrous sulfate concentrations (0, 3, 6, 6, 9 and 15 g/L), keeping temperature and pH constant. The tests were carried out in three consecutive stages, starting with inoculum, whose cell content was 7.05x107 Cel/mL, then the strain with the highest population obtained in the previous stage was used, observing the variation in the periods of adaptation and growth. During the bioleaching of sulfide minerals, in the first stage the maximum bacterial population reached was 4.75x107 Cel/mL in 24 days with 6 g/L of ferrous sulfate, in the second stage the maximum population was 6.30x107 Cel/mL without the addition of ferrous sulfate and in the third stage the bacterial population reached 4.51x107 Cel/mL. The exponential growth of the population started at approximately 13, 8 and 3 days respectively in each stage.

Analysis of the Oxidation-Reduction Potential and Bacterial Population of Acidithiobacillus ferrooxidans during the Bioleaching Study of Sulfide Ores