The Gidji Roaster, one of Australia’s largest operating gold mines, is owned and operated by Kalgoorlie Consolidated Gold Mines. An ultrafine grinding circuit was required to treat concentrate that could not be treated through the roaster and hence to maintain gold production. The project is near the town of Kalgoorlie, about 600 kilometers east of Perth, Western Australia.

Tetra Tech Proteus delivered a study followed by detailed engineering design, procurement, and construction (EPC) for the ultra-fine grinding plant upgrade at the Kalgoorlie Consolidated Gold Mines facility. The project was conducted as a lump-sum EPC contract.

Kalgoorlie Mines has implemented an air quality control strategy to reduce emissions of sulphur dioxide from the roaster. The success of the project has led the company to investigate the use of additional ultra-fine grinding mills to treat a larger amount of the concentrate and thereby further reduce emissions in the area and improve local air quality.