Who may change a gas alarm setting?

• A. Any surface supervisor
• B. Person authorised by the ventilation officer
• C. The shift manager
• D. Any underground employee with gas detector

Answer: (B)

The rule hinges on who has formal responsibility for gas detection and alarm settings in the mine. The ventilation officer is the person in charge of gas monitoring strategy and alarm thresholds, so only someone who has been specifically authorised by the ventilation officer may change a gas alarm setting. This ensures changes are made by someone trained, accountable, and able to document the rationale and impact, preserving safety and regulatory compliance.

Allowing any surface supervisor, a shift manager, or any underground employee with a detector to adjust settings would bypass the controlled approval process, risking inappropriate thresholds, missed alarms, or nuisance alarms, and it would undermine the safety governance structure that expects changes to be reviewed and recorded.

So, the best answer is the person authorised by the ventilation officer, because that designation ensures proper training, authorization, and traceable safety management.