Comminution 1998
This paper presents observations made during the conduct and analysis of eleven separate autogenous and semi-autogenous pilot plant trials. These trials were conducted using different ores for various projects over the past five years. The ores tested include relatively competent porphyry, diorite, chlorite and serpentine ores with Bond ball mill work indices ranging between 15 kWh/t and 18 kWh/t. However, Bond ball mill work index alone was not an effective determinate of primary mill power requirement.
> Ore Competency and the Design of AG/SAG Circuits