* Semi-autogenous (SAG) grinding is a grinding process carried out with small amount of ball charge (4-15%) unlike ball mills and with the help of bigger parts crumbling the smaller parts of ore.
    * To achieve this type of grinding, SAG mills with large diameter and short length have been developed to take advantage of the kinetic energy of the free falling coarse particles.
    * SAG mills are primarily preferred in gold, copper, platinum and silver mines as well as lead, zinc and nickel etc. mines
    * Majority of large tonnage ore plants uses SAG mills in their systems.
ADVANTAGES OF SEMI AUTOGENOUS (SAG) MILLS
    * In conventional systems, the reduction ratio of the grain size is distributed to the crushers. The material must be passed through multiple number of crushing / sieving steps in order to be reduced to the milling (10-12 mm) size.
    * Crushing and screening of clayey and adhesive materials are very difficult in systems using multi-stage crushing lines. The system is constantly clogged and encountered problems due to seasonal conditions, requiring additional measures. (Such as the stocking of broken material in summer)
    * SAG mills are the machines with the highest reduction rate which performs crushing, grinding and washing together. It offers a much higher reduction ratio than 3-stage crushing and screening system.
    * Feeding material in the dimension of 200-300 mm, is reduced to d100: 2 mm and below. This capability increases the efficiency of the ball mill while reducing the circulating load of the system.

STANDARD SIZES AND DIMENSIONS
Diameter Lenght ~Chamber Volume Mill Speed AG
Motor Power
SAG
Motor Power
SAG Max.
Ball Charge
mm mm m3 rpm kW kW ton
4000 1600-3000 20-37 16,2 185/315 355/500 11-20
4500 1800-3200 29-51 15,2 315/400 450/710 16-28
5000 2000-3600 39-11 15,1 355/500 560/1000 22-40
5500 2200-4000 52-95 13,7 500/710 710/1300 29-53
6000 2500-4500 71-127 13,2 630/950 1200/1800 40-71
6750 2800-5000 100-179 12,4 800/1400 1500/2800 56-100
7250 3200-5200 132-217 11,9 1500/2300 3000/4500 74-122
8000 3500-5500 176-276 11,3 1800/2600 3500/5500 99-155

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