Milling

The ore treatment plant is three stages crushing at surface, milling, flotation, and filtration plant which processes a chalcopyrite ore to produce a chalcopyrite concentrate.

This plant uses secondary, tertiary and quaternary crushing to produce the crushed ore feed for the grinding mills. Tailings are discharged at the Princess Creek Tailings Dam located 8.5 kms away from the site.

The overland conveyor discharges the ore to a surge bin. Vibrating feeders draw ore from the surge bin to feed the secondary crushing plant. The secondary crusher product is conveyed to the covered intermediate ore storage that has a capacity of 12 000 tonnes then it goes to tertiary crushing plant consists of a double deck vibrating screen with 22mm and 8mm aperture. The tertiary product is conveyed via a series of steeply inclined conveyors to the quaternary crushing plant. The final product (p80 8.5mm) is conveyed to the fine ore storage bins.

Concentrates are transported by road from the filter shed to the Melba Flats railway siding, 35 kilometres away and then to the port of Burnie from where it is exported to Sterlite’s copper smelter in Tuticorin, India.