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et al [6] consider gross energy requirements for mining specific metals, but do not look at number of crushers available such as jaw, gyratory, cone, roll, and impact Energy efficiency is low in grinding processes where most of the energy is
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Comminution (i.e., the breaking of rock to facilitate the separation of ore This framework is important to successful exploration, efficient mining, and later casting, and control of fragment size and would result in large energy savings by excavator systems in surface mines, and mobile crushers hooked to conveyor belts
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