In auger work near old mine workings, how often should CH4 be checked?

In auger work near old mine workings, how often should CH4 be checked?

• A. Every 20 minutes
• B. Every 60 minutes
• C. Every 4 hours
• D. Never

Answer: (A)

Checking methane levels every twenty minutes is essential when auger work is conducted near old mine workings because those areas can trap or release methane quickly. Old workings may harbor pockets of CH4 that can accumulate behind collapsed passages or in voids, and disturbing the rock with an auger can release gas into the working air. Methane is flammable, so detecting increases promptly allows you to stop work, improve ventilation, or evacuate before concentrations become hazardous. More generous intervals, like every sixty minutes or every four hours, miss rapid gas buildup; and never checking is unsafe. Using a properly calibrated gas detector or monitor and following ventilation controls is part of staying safe in these conditions.

Checking methane levels every twenty minutes is essential when auger work is conducted near old mine workings because those areas can trap or release methane quickly. Old workings may harbor pockets of CH4 that can accumulate behind collapsed passages or in voids, and disturbing the rock with an auger can release gas into the working air. Methane is flammable, so detecting increases promptly allows you to stop work, improve ventilation, or evacuate before concentrations become hazardous. More generous intervals, like every sixty minutes or every four hours, miss rapid gas buildup; and never checking is unsafe. Using a properly calibrated gas detector or monitor and following ventilation controls is part of staying safe in these conditions.