Is it safe to work near a misfired hole?

Is it safe to work near a misfired hole?

• A. Yes
• B. No
• C. Only after testing
• D. Only with PPE

Answer: (B)

A misfired hole is dangerous because the explosive charge may not have detonated as intended and can still detonate later, causing a sudden, powerful blast. There can also be residual gas, unstable ground, and flying debris. For this reason, it isn’t safe to work near a misfired hole, even with PPE or after a quick test. The proper action is to stop work, evacuate the area, and await a qualified blasting supervisor to assess and clear the hole. Re-entry should only occur after the misfire is officially deemed safe and the area is secured. PPE or testing alone does not eliminate the risk of delayed or secondary detonation.

A misfired hole is dangerous because the explosive charge may not have detonated as intended and can still detonate later, causing a sudden, powerful blast. There can also be residual gas, unstable ground, and flying debris. For this reason, it isn’t safe to work near a misfired hole, even with PPE or after a quick test. The proper action is to stop work, evacuate the area, and await a qualified blasting supervisor to assess and clear the hole. Re-entry should only occur after the misfire is officially deemed safe and the area is secured. PPE or testing alone does not eliminate the risk of delayed or secondary detonation.