A cooling tower in a mining context is a heat rejection system used to dissipate waste heat generated by industrial processes, machinery, or refrigeration systems within a mine or mineral processing plant. In mining operations such as bauxite refining (Bayer process), gold processing (CIL/CIP circuits), iron ore pelletising plants, and diamond processing facilities, significant quantities of heat are generated by crushing and grinding circuits, compressors, hydraulic power units, electrical transformers, and chemical processes that require temperature control. Cooling towers work by passing warm water through a structure where it is exposed to moving air, causing a portion of the water to evaporate and thereby removing heat from the remaining water, which is then recirculated to cool equipment. There are two primary types: wet cooling towers (which use evaporative cooling and require a continuous water supply) and dry cooling towers (which use air convection without water evaporation, suitable for water-scarce mining environments). In underground gold and deep-level mining operations, cooling towers are a critical component of the mine refrigeration system, which is essential to maintain safe working temperatures in hot, deep stopes where rock temperatures may exceed 55°C. In bauxite refineries, cooling towers manage the heat from digestion and precipitation processes. Cooling tower performance is characterised by the range (temperature drop of water), approach (difference between cold water temperature and ambient wet-bulb temperature), and cooling efficiency. Regular maintenance — including drift eliminator cleaning, fill media replacement, and microbiological treatment — is essential to prevent Legionella contamination and ensure thermal efficiency.
