Ore Beneficiation an overview ScienceDirect Topics. Mount Tom Price DMS plants Like the Sishen plant, the Mount Tom Price plant utilizes ferrosilicon as dense medium A coarser grade (65D) is used for the drum plant and a finer grade (150D) for the cyclones The efficiencies for the RTIO DMS plants also exhibit typically very small Ep s—in the region of 005–01 kg/dm 3