Porgera Gold mine, flotation, autoclave, leaching and acacia reactor improvements

摘要

The Porgera Gold mine in the highlands of PNG, treats 5.5 - 6.0 million tonnes of ore per year with a SAG / Ball Mill grinding circuit. The Anawe processing plant consists of a gold bearing pyrite flotation circuit, 4x autoclaves processing flotation concentrate and a Leach-CIP circuit. This paper describes a range of process improvements in the Anawe processing plant resulting in significant recovery and capacity improvements. These include; Installation of a pyrite concentrate export plant (CEP) in 2015 to debottleneck autoclave processing capacity. Improvements in autoclave throughput through operational control changes to oxygen addition and feed controls. Improved leach circuit control, resulting in improved gold recovery, reagent addition savings and cyanide code compliance. Acacia recovery optimisation.