If an auger penetrates old mines, when should you check for CH4?

If an auger penetrates old mines, when should you check for CH4?

• A. Every 20 minutes
• B. Every 2 hours
• C. Once per day
• D. Never

Answer: (A)

When you’re augering into old mine workings, methane can hide in pockets and be released suddenly as you advance. The atmosphere around the drill can change quickly, so you need frequent checks to catch dangerous increases in CH4 early and keep ventilation effective. Checking every 20 minutes is a practical rule that provides timely detection without slowing work too much, allowing you to stop, ventilate, or retreat if methane levels rise. Checking less often (every couple of hours or once per day) risks missing a rapid methane surge, which can create an explosive or toxic environment before you notice it. “Never” is obviously unsafe, since CH4 hazards require continuous or frequent monitoring. In this context, the 20-minute interval is the prudent standard to protect workers and maintain safe working conditions.

When you’re augering into old mine workings, methane can hide in pockets and be released suddenly as you advance. The atmosphere around the drill can change quickly, so you need frequent checks to catch dangerous increases in CH4 early and keep ventilation effective. Checking every 20 minutes is a practical rule that provides timely detection without slowing work too much, allowing you to stop, ventilate, or retreat if methane levels rise.

Checking less often (every couple of hours or once per day) risks missing a rapid methane surge, which can create an explosive or toxic environment before you notice it. “Never” is obviously unsafe, since CH4 hazards require continuous or frequent monitoring. In this context, the 20-minute interval is the prudent standard to protect workers and maintain safe working conditions.