Impact of the stirred mill grinding mechanism on the IMPACT OF THE STIRRED MILL GRINDING MECHANISM ON GRINDING PERFORMANCE AND MEDIA CONSUMPTION H Erb1 C Cronje2 T Mahlangu2 B Ebell3 Y Hanuman4 F Smit5 and H Lehto6 1Swiss Tower Mills Minerals Ltd Switzerland 2Randgold South Africa 3DRD Gold South Africa 4Anglo American Platinum South Africa 5DRA South Africa 6Outotec Finland