A Method of C alculating Autogenous/ Semi
ball mill work index was averaging only 116 kWh/t, which is not hard A rod mill work index fi gure was not found but was thought to be in the 16 kWh/t to 18 kWh/t range The Xstrata Zinc 22 ft ID × 40 ft EGL over ow ball mill fl was installed at Mt Isa in 2009 This mill was put into single...