How should tamping be done when loading explosives in a borehole?

• A. Light blows only
• B. Heavy blows with a hammer
• C. Vigorous tamping
• D. No tamping required

Answer: (A)

The idea being tested is how to seat and compact explosive charges in a borehole safely and effectively. Tamping should settle the charge so it is uniform and firmly in place, but not so aggressively as to create dangerous conditions.

Light blows provide gentle, controlled compaction that helps the charge settle evenly along the borehole without introducing excessive pressure, heat, or friction. This minimizes the risk of creating hot spots, voids, or other irregularities that could affect performance or safety. Heavy or vigorous tamping can over-compact the charge or shock the detonation system, increasing the chance of a misfire or other hazards. Not tamping at all leaves voids and poor confinement, which also risks unreliable performance.

So, light blows only is the best approach because it achieves orderly seating with minimal risk, ensuring a consistent and safe loading. Always follow site-specific safety protocols and approved practices when tamping.