A major breakthrough in extending the life of the wear material of high pressure roll crushers when treating moist, highly abrasive material has removed the last impediment to the widespread acceptance of high pressure comminution in the minerals industry. The system is very energy efficient. It has been demonstrated that in the cement industry energy savings of up to 50 per cent have been achieved compared to conventional hall milling. Besides being energy efficient, the process provides some remarkable and useful effects; better liberation of mineral constituents (as proven for diamond liberation). preferential comminution where induced micro fissures follow grain boundaries. higher reactivity of the product due to micro fissures. All these points will be described here together with a review of current flowsheet design and incentives for the use of this method of Comminution.