What is the purpose of lockout/tagout procedures in underground mining?

• A. To ensure all workers are trained in emergency response.
• B. To ensure energy sources are isolated and cannot be re-energized during maintenance.
• C. To monitor air quality during blasting.
• D. To secure the mine door during shift changes.

Answer: (B)

Lockout/tagout procedures are about keeping energy from energizing equipment while it’s being serviced. In underground mining, machines like conveyors, drills, pumps, and ventilation fans can carry electrical energy or have stored hydraulic, pneumatic, or mechanical energy. Before maintenance starts, all energy sources are isolated and locked out so the equipment cannot be turned back on, and a tag is placed to warn that work is in progress. The lock is typically kept by the worker performing the service, who is the only one who can remove it, ensuring they control when the equipment is re-energized. After confirming the system is completely de-energized and safe, maintenance proceeds and, once finished, the locks are removed and power is restored.

Others practices like emergency response training, air quality monitoring during blasting, or securing a mine door are important safety measures, but they don’t accomplish the specific purpose of preventing equipment from being energized during maintenance.