What is a key consideration when managing underground ventilation during shift changes?

• A. Maintain continuous airflow throughout the shift change.
• B. Increase airflow only after handover is completed.
• C. Maintain continuous airflow, verify fan operation, and ensure fresh air supply to all working faces during handover.
• D. Close ventilation to pressure test equipment.

Answer: (C)

During shift changes underground, ventilation remains a safety-critical control because workers, equipment movement, and potential gas or heat generation can shift air flows quickly. The best approach is to keep airflow running continuously, check that the fans are operating properly, and ensure fresh air is reaching all working faces during handover. This practice helps prevent gas accumulation or heat buildup in any part of the mine while crews are transitioning, and it ensures the new shift starts with adequately ventilated working places.

Keeping ventilation off or reduced during handover (or only increasing airflow after handover) can create stagnant pockets of gas, and closing ventilation for pressure testing would remove necessary air supply and increase risk.