What must be done to the immediate area before blasting according to DMM-62 permit requirements?

The requirement to freshly rock dust an area within a 100-foot radius before blasting is crucial for several reasons. Rock dusting is a practice that helps mitigate the risk of coal dust explosions by creating a non-combustible layer that suppresses the ignitability of combustible dust. This preventative measure plays an essential role in ensuring the safety of miners and the stability of the mine environment during blasting operations.

By establishing a freshly rock dusted perimeter, you reduce the potential for flyrock and flying debris to create additional hazards. Additionally, rock dust helps in absorbing heat and can effectively dull the impact of shock waves generated during a blast, enhancing overall safety for personnel in and around the mine. This requirement aligns with best practices and regulations set forth in safety permits like DMM-62, ensuring a controlled and safe blasting environment.