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|High levels of contamination (non magnetics) were present in the magnetite medium of the D.M. cyclone circuit. Attempts were made to minimise the amount of undersize (-lmm) material in the D.M. cyclone feed by improving initial desliming and examining those factors that contributed to any overall reduction in desliming efficiency. Circuit density control was improved and a system of continuous contamination monitoring implemented. A brief description is included of the major alterations to circuit control philosophy. The significant improvement in overall D.M. cyclone circuit performance is outlined.|