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Producing metals from common rocks: The case of gold, · The control for the particle size output (P80) for the SAG mill is 6000 um. Screen 2 feeds the circuit of the two ball mills (Ball Mill 1 and 2). Control of the passing particle size (P80) for these mills were 500 μm and 75 μm, respectively. Cyclone 1 is locatedCrusher, · Crushers are used to reduce particle size enough so that the material can be processed into finer particles in a grinder. A typical processing line at a mine might consist of a crusher followed by a SAG mill followed by a ball mill. In this context, the SAG mill and