### A Method of C alculating Autogenous SemiAutogenous

2018220including a 32 ft SAG mill, being put on hold This mill has been operating inefciently due to the hard coarse feed The rod mill work index has not been de ned as yet The ball mill work index is con rmed at 16 kWh t The operating work index, though, is in the range of 21 kWh t to 25 kWh t showing high inefciency

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