Abstract: A process which comprises passing soft limerock through a primary crusher, adding water to the crushed rock, passing the crushed rock and water through a series of screens with successively smaller screen openings while adding additional water to each screen, collecting the rock not passing through the screens and passing a portion of it through a secondary crusher and recycling the product to the series screens, collecting the rock passing through all screens and causing it to pass through a screw conveyor with a large excess of water and collecting fine particles of crushed soft limerock from the screw conveyor for use in preparing asphalt road paving material.