Acidithiobacillus

Acidithiobacillus is a genus of proteobacteria. The members of this genus used to belong to Thiobacillus, before they were reclassified in the year 2000.
 * Acidithiobacillus ferrooxidans (syn. Thiobacillus ferrooxidans) lives in pyrite deposits, metabolizing iron and sulfur and producing sulfuric acid.
 * Acidithiobacillus thiooxidans (syn. Thiobacillus thiooxidans) consumes sulfur and produces sulfuric acid. Discovered due to damage to sewer pipes containing hydrogen sulfide.

Both of these bacteria are used in a mining technique called bioleaching whereby metals are extracted from their ores through oxidation. The bacteria are used as catalysts.