As near-surface oxide orebodies are depleted, mines are having to process deeper sulfide ores that are lower in metal grade and metallurgically more complex. Modern technologies that are simple, cost effective and environmentally sound are required for their extraction. In many cases, bioleaching is the most suitable process.


A Bacox™ gold bioleaching plant, designed to treat 70 tonnes per day of a refractory pyrite-arsenopyrite concentrate, was commissioned at the Tasmania Mine (formerly the Beaconsfield Gold Mine) in Tasmania, Australia in 1999. Near-complete oxidation of the sulfides results in a gold extraction in excess of 95 per cent.