Fine Grinding IsaMill Core ResourcesXstrata Technology IsaMIll Fine Grinding 13 • Typical refractory gold IsaMill fine grind window 25 90 kWh/t to mill pyrite concentrates to P 80 10 12 µm 10 30 50 70 90 110 1 10 100 S p e c i f i c E n e r g y k W h / t Size um High 90 kWh/tonne Low 25 kWh/tonne Mean 60 kWh/tonne Fine Grinding 14 • Commercial IsaMill Installations Operation KCGM Owner Newmont Mining Corp