Advanced Mine Survey Certificate Exam Practice Questions - Advanced Certificate In Mine Survey (South Africa) Exam

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Why are roof pegs (spads) preferred over floor pegs for permanent survey control stations in underground development haulages?

Floor pegs are frequently disturbed or buried by track ballast, heavy mining machinery, and water accumulation Roof pegs provide direct line-of-sight to surface satellites through rock fracture zones Laser plummets can only project downwards from roof control points Roof rock is completely immune to any closure, convergence, or strata movement

Correct Answer:

Floor pegs are frequently disturbed or buried by track ballast, heavy mining machinery, and water accumulation

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