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Fig. 2. Initial and final population estimates (most probable number [MPN] g–1) of autotrophic iron and sulfur oxidizers in bulk mine tailings-compost mixtures. Treatment designations are as follows: K4 (pH 2.7); K6 (pH 5.7); OS (offsite control); CC (compost control); number following K4 and K6 are percentage mine tailings. Several treatments were undetectable (UD) at the 10–2 dilution level. Bars represent the upper and lower limit at a 95% confidence limit (p = 0.05).
