If the mine ventilation system fails totally or partly for more than 30 minutes, what must be in place?

• A. A SOP for action to ensure safety, including inspection of the affected ERZC and provisions to stop/restart work or restore power as necessary.
• B. An immediate evacuation of all personnel to the surface.
• C. A plan to continue operations without ventilation for 2 hours.
• D. A temporary shutdown of all electrical equipment.

Answer: (A)

When ventilation stops, you need a written plan that tells you exactly what to do to keep people safe and to manage bringing things back online. The plan should be a standard operating procedure for action, outlining how to assess the situation, what to do in the affected Emergency Response Zone (ERZ) area, and how to decide whether to stop or restart work or restore power. This is essential because loss of ventilation can lead to hazardous gas buildup and poor air quality underground; a clear, practiced procedure ensures actions are coordinated, roles are understood, and decisions to continue, pause, or resume work are made safely and consistently. Options that push for immediate full evacuation, continuing operations for a set period without ventilation, or focusing only on switching off electrical gear don’t address the full safety workflow or the need to verify the state of the ERZ region and the overall plan to reinstate safe conditions. Hence, a SOP for action that includes inspecting the affected ERZC and provisions to stop/restart work or restore power is the correct requirement.