Cutoff Slots in In-Stope Extraction Sequence
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Questions and Answers

What is the primary function of a COS in the in-stope extraction sequence?

  • To widen the orebody
  • To increase the angle of arc of drillholes
  • To reduce access constraints in stoping operations
  • To provide the initial void for subsequent rings (correct)

    • Why might slightly wider rings be fired into the initial slot adjacent to a COS?

  • To prevent ground collapse
  • To widen the slot void
  • To gain additional ground (correct)
  • To reduce the overall stope length

    • What may necessitate the inclusion of an additional COS in a stope?

  • An increase in orebody width (correct)
  • Access constraints
  • A decrease in stope length
  • A change in drilling technology

    • Why is fanning of blastholes into unbroken ground to strip the slot usually unsuccessful?

    <p>Blast holes are unlikely to pull to the full design depth</p> Signup and view all the answers

    What does a drill rig need to be capable of in order to minimize the angle of arc that the drillholes cover?

    <p>Drilling parallel holes across the orebody width</p> Signup and view all the answers

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