Which of the following is NOT a dangerous situation for a coal mine?

• A. The gas monitoring system is functioning and there is an SOP for using portable gas detectors
• B. Commencing sealing operations without notification or acknowledgement from an Inspector
• C. Controls in the PHMP have not been implemented or maintained
• D. A part of the mine has been sealed

Answer: (A)

In coal mine safety, having a gas monitoring system that is actually functioning and backed by a clear, written procedure for using portable gas detectors is the foundation of risk control. With the system active and an SOP in place, detectors are correctly calibrated, alarms are reliable, and the response to any gas issue is well-defined. That combination represents a controlled, safe state where you can detect and manage hazards before they become dangerous.

The other scenarios describe unsafe or non-compliant practices. Starting sealing operations without notifying or getting acknowledgment from an Inspector bypasses regulatory oversight and can trap gas or create unplanned hazards. If the controls in the PHMP haven’t been implemented or maintained, hazard controls may be ineffective, increasing the risk of gas ignition, contamination, or other dangers. While sealing a part of the mine can be a legitimate hazard-management action, doing so without proper procedures and approvals is unsafe, and in many contexts would be treated as a dangerous situation.

So, the safe, non-dangerous condition among these is having a gas monitoring system that is functioning with a documented SOP for portable gas detectors.