Z* recently completed a Mineral Resource Classification System (MRCS) for use on all De Beers operations. The main part of the MRCS is a scorecard system focussing on key aspects of diamond resource classification. An SQL database and user-friendly front end make this a robust, easy to use system with many unique qualities. De Beers believe that the system is best practice and that it will continue to provide accurate and repeatable estimates of the confidence in their mineral resources.