Dynamical cost and profit optimization comminution circuit M. Bengtsson, G. Asbjörnsson, E. Hulthén and Evertsson (Chalmers University of Technology, Sweden).....58 Increasing efficiency by selective comminution M. Hesse and H. Lieberwirth (Institute of Mineral Processing Machines, Germany).....77 Unlocking additional value by optimising current comminution .