# Ball Mill Sizing Calculation Spredsheet

Maximum ball size. 118 5000. NB. tph. 4000. Old production rate, tph. OPR 2 - log OR 72. OB. OPB. NPR. mm. 1.3. 5000. 36 F. 0.5 SG Wi C Deff. Target 0.5 0.333. 15. Feed size sieve size in mm which retains 20 material, mm. SG. SG. Specific weight of feed material, gmcm3. Wi. 15. Wi. Bonds work index, kWht C. 75 C. Mill speed as critical, Deff. 5.1. Deff

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