Abstract
Grinding circuit modifications to increase throughput normally involve high capital costs and relatively long construction periods, which in some cases can interfere significantly with production targets. The proposed modification of the La Coipa grinding circuit will result in an increase in mill throughput of 10% with a relatively low investment cost (approximately US$1 million), will not affect the normal operation of the plant during its installation and will keep the actual flowsheet as an alternative. The modification involves prescreening of the SAG mill feed to maximize power utilization of the pebble crusher in the SABC circuit. Simulation studies and in-plant testing have confirmed that during periods of “hard ore”, significant increases in throughput and mill efficiency can be obtained.
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