Moisture Content Analysis is the laboratory or field procedure used to determine the percentage of water present in a mined or processed material relative to its total mass. In bauxite mining, this analysis is critical because excess moisture affects the efficiency of the Bayer process during alumina refining and influences transport costs. In iron ore operations, moisture content directly impacts the commercial weight of shipments, since buyers pay for dry tonnes rather than wet tonnes, making accurate analysis essential for fair trade settlements. Gold and diamond operations rely on moisture analysis to optimize crushing, screening, and gravity separation circuits, since wet material behaves differently in classification equipment. Common analytical methods include oven drying at a standardized temperature (typically 105°C) until a constant weight is achieved, microwave drying for rapid results, and infrared moisture balances for continuous process monitoring. Results are usually expressed as a percentage of total wet mass. Consistent and accurate moisture content analysis supports process control, blending decisions, stockpile management, and compliance with international sampling standards such as those issued by ISO for bulk mineral commodities.
