SIX LEVELS OF SURETY FOR TAILINGS MANAGEMENT Our Tailings and Heap Leach Management Standard sets out six levels of inspection and surety for the safe management and operation of TSFs and heap leaches, these are: Monitoring technology Our operating sites employ monitoring systems such as vibrating wire piezometers, inclinometers, drone surveys, satellite surveys and imagery, static prisms for movement detection, drainage monitoring, and other technologies to monitor TSF’s abutments, natural slopes and water levels.