Mineral beneficiation is the collective set of physical, chemical, and metallurgical processes used to separate valuable minerals from gangue (waste) material in mined ore, thereby increasing the concentration and purity of the target mineral to meet downstream processing or market specifications. Beneficiation begins after the ore has been crushed and ground (comminuted) to liberate individual mineral particles and encompasses techniques such as gravity separation, magnetic separation, flotation, leaching, screening, and classification. In iron ore mining, beneficiation involves crushing, screening, wet or dry magnetic separation, and sometimes dense media separation (DMS) to upgrade low-grade hematite or magnetite ores into a marketable product with iron content typically above 60%. In bauxite mining, beneficiation may include washing, screening, and scrubbing to remove clays and silica, reducing reactive silica levels prior to Bayer process refining. Gold beneficiation encompasses gravity circuits, flotation, and cyanide leach systems to extract gold from host rock. Diamond beneficiation relies on dense media separation, X-ray luminescence sorting, and hand sorting. The degree of beneficiation required depends on ore grade, mineralogy, and product specifications. Beneficiation generates significant volumes of tailings and process water, necessitating robust water management and tailings containment systems.
