The first stage of rock breakage in any mining application is blasting. The purpose of blasting is to produce rock fragments small enough to be accepted by the processing plant. Blasted rock is “delivered” to the processing plant and subjected to the first stage of mechanical breakage, primary crushing. Primary crushers are large, rugged machines capable of handling large quantities of material and are used to reduce the size of blasted rock to sizes suitable for feeding secondary crushers. They typically handle feed sizes up to 1.5 meters with reduction ratios (ratio of particle feed size to product size) ranging from 3 to 10 (King, 2001).