Before entering a mine after an explosion, what examination should be prioritized?

Prioritizing the examination of return airways for smoke or fire before entering a mine after an explosion is crucial for the safety of all personnel involved. The primary concern in the aftermath of an explosion is the potential presence of hazardous conditions, such as smoke or further fires, which can severely threaten the lives of miners.

Return airways are responsible for venting air out of the mine and expelling any smoke or harmful gases, making it essential to ensure they are clear and safe before anyone reenters the mine. If smoke or fire is detected, it indicates an ongoing danger that would necessitate immediate action, such as evacuating the area and implementing fire suppression measures.

While checking a miner's personal gear, inspecting tools, and assessing the mine's structural integrity are also important safety measures, they should come after ensuring that the air quality and fire conditions in the return airways are secure. Addressing potential air quality issues first helps to prevent exposure to toxic gases or threats from fire, laying the groundwork for a safer evaluation of other factors within the mine.