7 ensp 0183 ensp The labour cost is the largest item in small and medium plants This is one reason for the modern tendency towards a larger ratio of reduction in the minimum number of crushing stages since the simplification of the layout that results reduces the cost of operating and maintenance labour considerably besides that of power and supplies 7 ensp 0183 ensp Metallurgical Content Crusher Selection Crusher Design Crusher InstallationCrusher CostsThe Crusher s Rock BreakersArea of Application Here is a list of Rules of Thumb often used in Rock Crushing and around Crushers Crusher Selection For a hard rock mine application below 600 tonnes hour select a jaw as the primary crusher Over 1 000 tph select a gyratory crusher Between