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|Oxidation rates of sulfidic mine wastes measured at a range of size scales have been collected from a number of sources. The results suggest that well-designed laboratory columns, under controlled conditions, provide comparable information on oxidation rates to that obtained from field test piles. It has been found in the cases presented that laboratory measurements of oxidation rates of a particular material type can be applied with confidence to the same materials in the field. It is recommended that a further study be undertaken to measure the time-dependence of the oxidation rate for a range of particle sizes and different materials. This study would provide measurements against which models of oxidation rate as a function of time and particle size can be tested, to give confidence in the use of models to describe dump behaviour in the longer term.|