Abstract
A thermophilic, rod-shaped, iron-oxidising bacterium was isolated by enrichment culture of rock samples from an overburden dump at the Rum Jungle mine site in Australia's Northern Territory. Oxidation of ferrous iron and sulfur occurred at 50–55°C, with a temperature maximum of 60°C. The isolate required yeast extract for growth. The pH optimum for iron oxidation at 50°C was 1.4. Rapid iron-oxidation occurred at a pH as low as 0.35, but little or no oxidation occurred at or above pH 2.2.
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