Andrew D. Bailey

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Bio-oxidation has proved to be a viable process for the oxidative pretreatment of refractory gold-bearing sulfides. Generally, the oxidation rate is maximal at 20% solids for high sulfide content materials [ca. 30% sulfur]. Low grade ores [1% sulfur] have been successfully oxidized at 55% solids, indicating a link between the sulfide grade of the material(More)
The relative significance of attached and unattached bacteria in bio-oxidation was assessed using a fluidised bed reactor. The unattached bacteria were removed from the system after different times in batch culture. Following wasout, the concentration of unattached bacteria recovered rapidly. This was ascribed to desorption of attached bacteria rather than(More)
In a recent paper [A. D. Bailey et al., Phys. Rev. Lett. 34,3124 (1993)], the authors presented direct planar laser induced. fluorescence measurements of the oscillatory ion fluid velocity field in the presence of a large amplitude drift-Alfvenj wave. Surprisingly, the measured speeds were an order of magnitude lower than predicted by standard fluid theory,(More)
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