Which of the following is a hazard commonly associated with blasting in coal mining?

• A. Misfires.
• B. Slippage of conveyors.
• C. Power outages.
• D. None of the above.

Answer: (A)

Understanding blasting hazards in coal mining starts with recognizing how the blast process can behave unpredictably. A misfire, where a charge fails to detonate as intended, is a common and serious hazard because it creates unexploded or partially detonated explosives underground. This means workers may have to re-enter, re-initiate the blast, or handle unexploded charges under strict, time‑consuming safety controls, all of which increase the risk of accidental detonation, delayed blasts, and dangerous rock movement. Misfires can also produce unexpected flyrock and excessive ground vibrations when finally triggered, compounding the danger.

Slippage of conveyors and power outages are general mining hazards or equipment issues, not specific hazards tied to the blasting event itself. None of the above would overlook the real blasting-specific risk that misfires represent.