MSHA: miner pinned for an hour while clearing jammed primary crusher

A miner was using an air hammer to break up a large rock while working on clearing a jammed primary crusher, when a dislodged rock slid down, pinning the miner’s feet – in a report by the Mine Safety and Health Administration. The victim was pinned for nearly an hour before being freed and taken to a nearby hospital for observation.

Best Practices: 

  • 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.


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