After smaller-sized crushed salt rocks (approximately 2 cm [1 in] in diameter) are fed from the secondary crusher, they are stored in production silos, allowing better control of the process. The secondary crushed rock storage silo is located outside the mine and feeds the finished material production process. Salt material needs to be monitored continuously to allow a smooth production cycle. Early detection of build-up that forms inside the silo is important to allow timely maintenance that will reduce risk of damage to the silo and unexpected interruptions to production.