Enumeration of thiobacilli within pH-neutral and acidic mine tailings and their role in the development of secondary mineral soil

Article Abstract:

The Lemoine tailings derived from a copper mine in Chibougamau, Quebec, were characterized. Approximately 40% of the tailings surface possess a pH of less than 3, while 23% are between 3 and 6. Microbial characterization showed the presence of Thiobacillus ferrooxidans in all sites, with the number of thiobacilli increasing as pH decreased. Areas with pH < 3 were the most metabolically active, while no leaching was detected at regions with pH > 6. However, it was shown that T. ferrooxidans can initiate acidification of pH- neutral tailings, and once acidification is achieved, can initiate new immobilized mineral phases.

Tailings (Metallurgy), Soil formation

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Potential role of Thiobacillus caldus in arsenopyrite bioleaching

Article Abstract:

The roles played by Thiobacillus caldus strains KU, BC13 and C-SH12 and Sulfobacillus thermosulfidooxidans in the bioleaching of arsenopyrite has been studied. T. caldus was previously reported to oxidize arsenopyrite faster than T. ferrooxidans at 22 degrees C. S. thermosulfidooxidans is a moderately thermophilic iron oxidizer but can also oxidize polythionates and S0. Results revealed that concentration of sulfur in the mixed defined culture is lower when the KU and BC13 strains are present. Tetrathionate levels were also comparable or lower than those when S. thermosulfidooxidans is present.

Bacteria, Thermophilic, Sulfur compounds, Thermophiles

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Examination of lipopolysaccharide (O-antigen) populations of Thiobacillus ferrooxidans from two mine tailings

Article Abstract:

A method to study lipopolysaccharide (LPS) chemotypes of Thiobacillus ferrooxidans grown in mine tailings and in synthetic medium was developed. Electrophoretic profiles of LPS extracted from the Lemoine and Copper Rand tailings, derived from copper mines located west and east of Chibougamau, Quebec, Canada, respectively, were determined. It was found that LPS heterogeneity exists among Thiobacillus isolates from the older Lemoine tailings. In contrast, the Copper Rand tailings, which represent newly colonized tailings, was colonized and acidified by only a single strain of T. ferrooxidans.

Analysis, Endotoxins

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