Results are given of investigations into the determination of the main structural and technological parameters of a high–gradient magnetic separator with a ball matrix. The design has been developed and a possibility has been outlined of effective beneficiation of kaolin at the magnetic induction 1.0 to 1.2 T. Comparative tests of separators with a ball matrix and a steel wool matrix (SALA–HGMS) have shown that the parameters of separation are the same. In the former case, however, a considerable reduction in specific input of metal, electrical energy, water and air per tonne of product is achieved. The advantage of the ball matrix is most fully displayed at the extraction of finely dispersed weakly magnetic particles from ores and slimes of low content of magnetic fraction.