When a burning charge in a blast hole occurs, its greatest danger is

When a burning charge in a blast hole occurs, its greatest danger is

• A. Immediate detonation
• B. Fly fire
• C. Hang fire / late blast
• D. Cratering

Answer: (C)

The main idea is that a burning charge in a blast hole can go into hang fire, meaning it may not detonate when expected and can explode after an unpredictable delay. That uncertainty is the biggest danger because workers might think the area is safe after a flame dies down or after a short wait, only to be hit by a late blast. This delayed detonation can occur while people are still nearby or when neighboring holes fire off, turning a planned event into a chaotic, highly dangerous situation. Immediate detonation is dangerous, but its timing is predictable, so safety precautions can be based on known timing. Fly fire refers to burning fragments or sparks, which are hazardous but typically less about timing and more about projectiles. Cratering is a physical outcome of the blast and not the immediate hazard presented by a burning charge. Therefore, hang fire or late blast best explains the greatest danger in this scenario.

The main idea is that a burning charge in a blast hole can go into hang fire, meaning it may not detonate when expected and can explode after an unpredictable delay. That uncertainty is the biggest danger because workers might think the area is safe after a flame dies down or after a short wait, only to be hit by a late blast. This delayed detonation can occur while people are still nearby or when neighboring holes fire off, turning a planned event into a chaotic, highly dangerous situation.

Immediate detonation is dangerous, but its timing is predictable, so safety precautions can be based on known timing. Fly fire refers to burning fragments or sparks, which are hazardous but typically less about timing and more about projectiles. Cratering is a physical outcome of the blast and not the immediate hazard presented by a burning charge. Therefore, hang fire or late blast best explains the greatest danger in this scenario.