How long should you wait after drilling a hole before it is packed with explosives?

How long should you wait after drilling a hole before it is packed with explosives?

• A. Immediately
• B. 1 hour
• C. 30 minutes
• D. 2 hours

Answer: (B)

The idea being tested is following a documented waiting period as part of a blasting plan. After drilling, you don’t just load explosives right away because the borehole environment and rock conditions need to be stabilized according to the plan. Waiting allows dust and cuttings to be cleared, moisture conditions to be accounted for, and the rock to reach a state where the stemming and explosive charge will perform as designed. The exact duration is specified by a qualified blasting engineer based on site-specific factors such as rock type, hole size, explosive type, and weather. It’s a safety and efficiency issue: loading too soon can lead to misfires, unstable fragmentation, or unintended initiation. So the best answer is the one that reflects adhering to the prescribed waiting time in the blasting plan, rather than improvising or rushing the process.

The idea being tested is following a documented waiting period as part of a blasting plan. After drilling, you don’t just load explosives right away because the borehole environment and rock conditions need to be stabilized according to the plan. Waiting allows dust and cuttings to be cleared, moisture conditions to be accounted for, and the rock to reach a state where the stemming and explosive charge will perform as designed. The exact duration is specified by a qualified blasting engineer based on site-specific factors such as rock type, hole size, explosive type, and weather. It’s a safety and efficiency issue: loading too soon can lead to misfires, unstable fragmentation, or unintended initiation. So the best answer is the one that reflects adhering to the prescribed waiting time in the blasting plan, rather than improvising or rushing the process.