AMIT 135 Lesson 7 Ball Mills Circuits Mining Mill Wet Ball Mill = kg kWh = A Dry Ball Mill = kg / kWh = i Replacement Ball Size Rowland and Kjos proposed the use of their equation for the determination of the initial and replacement media size Azzaroni 1981 and Dunn 1989 recommended the use of the following expression for the size of the makeup media d↠B F↠80 ↠Wâ