Where should rock dust be applied in a mine?

Rock dust plays a crucial role in coal mines, primarily as a fire prevention measure. Applying rock dust effectively helps to reduce the possibility of coal dust igniting and helps to mitigate the spread of any explosion.

The correct area for rock dust application is the roof, ribs, and bottom of the mine. This comprehensive coverage ensures that all surfaces where combustible dust may accumulate are treated, as coal dust can settle in various locations throughout the mine. By dusting these areas, it creates a non-combustible environment that can significantly improve safety for miners.

In contrast, limiting application to just the entrance would not provide adequate protection for the entire mining area, and targeting only the floor overlooks other critical surfaces that may harbor coal dust. Additionally, applying rock dust near electrical equipment might not address the broader inhale-explosion risks present in the mined area, and focusing solely on the floor does not account for the dust that gathers on the walls or ceiling. Therefore, the thorough application of rock dust to the roof, ribs, and bottom is essential for maintaining safe mining conditions.