Wet processing in mining is a comprehensive term encompassing all mineral processing operations and unit processes in which water is the primary working fluid, used to transport, classify, separate, concentrate, wash, and recover minerals from run-of-mine ore. In bauxite, gold, iron ore, and diamond mining, wet processing circuits are distinguished from dry processing approaches (such as dry screening, air classification, and dry magnetic separation) by their extensive reliance on water throughout every stage of the ore treatment flowsheet. Wet processing plants in mining are complex industrial facilities that integrate multiple interconnected unit operations including crushing, milling, scrubbing, screening, gravity separation, magnetic separation, flotation, thickening, filtration, and product storage. The choice to employ wet processing over dry processing is driven by factors including the presence of significant clay content in ore that requires water for effective disaggregation, the fine grain size of valuable minerals requiring wet milling for liberation, the availability and cost of water in the mining region, dust generation and occupational health considerations, and the metallurgical amenability of the ore to wet separation techniques. In iron ore processing, wet processing is used in the beneficiation of lower-grade ore bodies to produce high-purity iron ore products from Brockman, Marra Mamba, and channel iron deposit ore types. In gold processing, wet processing via cyanide leaching remains the dominant recovery method globally. Environmental considerations in wet processing include the management of process water containing residual reagents and metals, the design of tailings storage facilities for slurry discharge, and the implementation of water recycling systems to minimize freshwater consumption.
