Mineral processing uses a variety of sorting procedures to obtain pre-concentrates and concentrates. Here, the relationships between selected material and machine related influences and the enrichment by selective comminution are examined for a fluorite/barite dump material. The single particles impact comminution tests will quantitatively be assessed using ore separation degree eta(Erz). The quality characteristics of the enriched pre-concentrates obtained in the studies are similar to those found on industrial scale plants obtained with conventional technolgies.