Abstract: An apparatus for electrostatically concentrating mineral particles includes a pair of oppositely charged collector electrodes spaced apart from each other and oriented so that a flow path is formed between them where material containing mineral particles can fall by gravity through at least a major portion of the flow path and the mineral particles will be charged and attracted to the electrodes. Each electrode includes a collector surface formed of a dielectric material which defines at least a substantial portion of the flow path. Ionizers are located midway between the collector electrodes for charging mineral particles at a plurality of locations along the flow path.