... the performance of jaw crushers and ball mills for the pre-processing of their ores. The objectives of this experiment are to find the particle size distribution and average particle size reduction in a jaw crusher, the particle size distribution and average particle size reduction in a ball mill, and the optimum pulp density to be used in the ball mill. In the first part of experiment, three rocks were weighed and crushed using a pilot scale jaw crusher. A screen analysis was performed to measure the amount of particles and their size distribution. The rocks were reprocessed in the jaw crusher and the size distribution was determined again. In the second part of the experiment, three mixtures of sand and water (20%, 30%, and 40% weight of sand) were prepared and placed in three separate ball mills. Each mixture was ground using the ball mill roller, filtered by vacuum ...

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