Mine Surveyor's Certificate Of Competency Exam Practice Questions - Mine Surveyor's Certificate Of Competency Examination (South Africa) Exam

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When advancing an underground tunnel towards an unmapped or flooded working within the statutory 50m water danger zone, what pilot borehole pattern is mandated by MHSA survey regulations?

A single center hole drilled 5 meters ahead of the tunnel face Pilot holes drilled at least 15 meters ahead of the face, accompanied by side/flank holes drilled outwards at an angle Four vertical holes drilled upwards into the hanging wall every 10 meters No drilling is required if electronic ground penetrating radar is utilized

Correct Answer:

Pilot holes drilled at least 15 meters ahead of the face, accompanied by side/flank holes drilled outwards at an angle

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