The wear rate increased with increasing the rotation speed ofmill in range investigated. According to Ref. [23]; this may be caused by the fact that the balls are lifted higher at high rotation speed and the balls have stronger impacts on the mill shell upon falling on to the coupon, which increases the abrasive wear. It was mentioned, if the rotation speed was close to or higher than the critical speed, the wear rate was reduced significantly because the media were held against the shell by centrifugal force and no abrasive wear happened at this speed range. It was observed that wear rate reduced with increasing thecharge weight of balls to a certain value and then with furtherincreasing enhanced. It was obvious that wear rate decreased with increasing the millthroughout. However this factor had the little influence on wearrate. This behavior is attributed to the fact that increasing millthroughout reduced the motion space of the balls, reducing thecontact chance between the balls and the mill shell.