What arrangement must be made so alarms can be acknowledged if gas alarm levels are exceeded?

• A. UG mine must have a SOP for acknowledging alarms when gas alarm levels are exceeded, and must provide for 1 person on the surface whenever persons are underground and authorised by the UMM to acknowledge alarms
• B. The surface supervisor may acknowledge alarms when signaled by sensors
• C. Alarms are acknowledged automatically by the system once levels return to normal
• D. A dedicated control room operator must acknowledge alarms

Answer: (A)

When gas alarm levels exceed the set thresholds, there must be a clear, formal process for acknowledging those alarms. The correct arrangement requires the underground mine to have a written standard operating procedure that covers how alarms are acknowledged, and it also requires that at least one person on the surface is available to acknowledge the alarm, with that person authorised by the Underground Mine Manager to do so while people are underground. This combination ensures there is a defined, accountable person on the surface who can promptly acknowledge the alarm, maintain proper communication with underground crews, and trigger the necessary safety actions. It also sets the authority and responsibility for acknowledgment, preventing delays or confusion that could arise if the system auto-clears or if acknowledgments are left to someone without explicit authorisation. Other options fall short because they either rely on a supervisor without the required formal SOP and authorisation, assume automatic system acknowledgment, or designate a control room operator without the explicit surface-authorization framework and surface-officer role defined by the Underground Mine Manager.