If a 1% reading of methane is detected anywhere in a working mine, what action should be taken?

If a 1% reading of methane is detected anywhere in a working mine, what action should be taken?

• A. Evacuate the area and continue operations
• B. Shut off power to all equipment in the affected area and reventilate
• C. Increase ventilation only
• D. Ignore the reading

Answer: (B)

When methane is present in a mine, the immediate priority is to remove ignition sources and dilute the gas to safer levels. A 1% reading shows methane has accumulated in the area, so actions must both stop potential sparks and reduce the gas concentration. Shutting off power to all equipment in the affected area eliminates electrical sparks and heat sources that could ignite methane. At the same time, ventilating the area brings in clean air and speeds up dilution of the gas, lowering the chance of forming an explosive mixture. This combination directly reduces the two biggest risks: ignition and high methane concentration. Choosing to evacuate and continue operations would keep people at risk and allow equipment to potentially ignite methane if any sparks occur. Increasing ventilation alone may help lower gas levels but leaves ignition sources in place. Ignoring the reading is simply unsafe.

When methane is present in a mine, the immediate priority is to remove ignition sources and dilute the gas to safer levels. A 1% reading shows methane has accumulated in the area, so actions must both stop potential sparks and reduce the gas concentration.

Shutting off power to all equipment in the affected area eliminates electrical sparks and heat sources that could ignite methane. At the same time, ventilating the area brings in clean air and speeds up dilution of the gas, lowering the chance of forming an explosive mixture. This combination directly reduces the two biggest risks: ignition and high methane concentration.

Choosing to evacuate and continue operations would keep people at risk and allow equipment to potentially ignite methane if any sparks occur. Increasing ventilation alone may help lower gas levels but leaves ignition sources in place. Ignoring the reading is simply unsafe.