The Mine Safety and Health Administration (MSHA) issued a Serious Accident Alert after a miner was pinned in a gyratory crusher. On October 22, 2017, a miner was working to clear a jammed primary crusher at a surface limestone mine. He was using an air hammer to break up a large rock, when another rock dislodged and slid down, pinning his feet. The miner was pinned for nearly an hour before being freed and transported to a nearby hospital for observation.
offers the following Best Practices to help prevent this type of accident:
- Establish policies and follow manufacturer’s recommended procedures for conducting specific tasks on crushers. Implement measures to ensure miners are positioned safely and protected from hazards while performing the task.
- Task train persons to recognize all potential hazardous conditions and to understand safe job procedures for elimination of the hazards before beginning work.
- Do not work below unsecured material.
- Remove excess material by mechanical means where possible before the cause of the blockage can be dealt.
- When removal of material by hand is necessary, the crusher and associated plant must be stopped and isolated.
- Manual removal should only be carried out by suitably trained and competent persons.