"Rock mills"@en . . "Some quarries are using them for ripping softer rock up were blasting is not allowed, instead of ripping with a large Bulldozer An advantage is the smaller size of the materail produced removes the need for a primary crusher and in some cases, just needs screening, resulting in production cost advantages."@en . . . . "Some quarries are using them for ripping softer rock up were blasting is not allowed, instead of ripping with a large Bulldozer An advantage is the smaller size of the materail produced removes the need for a primary crusher and in some cases, just needs screening, resulting in production cost advantages."@en .