Fiery Mines Blasting Certificate Exam Practice Questions - Fiery Mines Blasting Certificate Of Competency Examination (South Africa) Exam

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In a coal face blast round utilizing short-delay electric detonators, what is the critical reason for enforcing a maximum total delay time (typically under 0.75 to 1.0 second) between the first and last shot?

To prevent earlier shots from opening up coal fissures, releasing methane, or creating suspended dust clouds that could be ignited by later delay shots To ensure the exploder battery does not drain before the final delay detonator receives electrical current To prevent the roof bolts from vibrating loose prior to the final row of blast holes firing To limit ground vibration frequencies below human perception limits for section miners

Correct Answer:

To prevent earlier shots from opening up coal fissures, releasing methane, or creating suspended dust clouds that could be ignited by later delay shots

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