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Surface colonization and microbial dissolution of pyrite were studied in the laboratory and by in situ surface colonization experiments conducted at Iron Mountain, California. Laboratory experiments involved organisms obtained from Iron Mountain and cultured in pH &lt; 1.0, 42 °C solutions designed to enrich for chemolithotrophic species present at acidgenerating sites. Planktonic and sessile microorganisms grew in enrichment cultures containing small amounts of yeast extract. The maximum density of attached cells was approximately 8 × 10 6  cells/cm 2 . Attachment was specific for pyrite and occurred nonrandomly; rod-shaped bacteria tended to orient parallel to {100} and {110} pyrite. Attachment resulted in formation of euhedral dissolution pits. Cultures grown without yeast extract contained only planktonic cells and euhedral dissolution pits were not developed on the pyrite surface. All cultured organisms were identified as bacteria by fluorescence in situ hybridization and domain-specific probes. Leptospirillum ferrooxidans comprised 10-40% of planktonic organisms in both enrichments. Thiobacillus ferrooxidans was not identified in either enrichment. Oxidation rates were approximately equivalent in both enrichments (4 × 10 -7  μM Fe/cell·day) over a 28 day period.

Microbial oxidation of pyrite: Experiments using microorganisms from an extreme acidic environment