Crusher Efficiency Calculations - 911 Metallurgist. in a two-stage crusher plant at the rate of 70 tons per hour. The maximum size of output is to be 1½ in., and separation of materials over 1 in. size and the minus 1 in. in the output is required. Select a jaw crusher like those included in this table.evaluation of cone crusher effeciency,evaluation of cone crusher effeciency,Field monitoring and performance evaluation of crushing plant .how each production unit affects efficiency of the whole plant (Svedensten and. Evertsson, 2004). Therefore . Crushing is done in three stages with a combination of one jaw and two cone crushers that work in close circuit with a . Field monitoring and performance evaluation of crushing plant operation. 617. Fig. 1. Typical.