Application of Operating Work Indices in Autogenous much flatter slope than that of the final product TECHNICAL PAPER 2001 47 pArAmeter vAlue Feed Size F 80 mm 177 Transfer Size T 80 μm 726 Product Size P 80 μm 74 AG/SAG Wio AWio kWh/t Ball Mill Wio BWio Circuit Wio OWio Bond Ball Mill Work Index BWi kWh/t Bond Rod Mill Work Index RWi kWh/t Table 1