Acidithiobacillus caldus

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Acidithiobacillus caldus is a rod shaped Gram negative acidophile with pH and temperature optima of 2.5 and 45°C, respectively. It is often considered a ‘weed’ in bioleaching operations as it is usually the dominant reduced inorganic sulfur compound oxidizer at mesophilic and moderately thermophilic temperatures.

Acidithiobacillus caldus often increases leaching efficiency compared to an iron oxidizer alone by removing sulfur rich compounds that accumulate on the surface of sulfide minerals during bioleaching/biooxidation.


Hallberg & Lindström, Microbiology (1994) 140: 3451-3456

Dopson & Lindström, Appl Environ Microbiol (1999) 65: 36-40

Edwards et al. Environ Microbiol (2000) 2: 324-332.

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