the ore is mixed with water in two rotating SAG mills which use the larger rocks and 8-inch steel balls to …Inside a ball mill crushing the ore into a powder. This process of reducing the size of the rocks requires a lot of energy. Just image how hard it is to break a rock. How much more energy do you think is needed to crush a rock until it is like sand?Since there are not that many small SAG mill operations of under 2000 TPD,