Blast Design Parameters in Mining Engineering
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Questions and Answers

What is one of the key factors that determine the location of a Central Ore Shoot (COS)?

  • Orebody depth
  • The diameter of the drill rig
  • Access constraints (correct)
  • The angle of arc of the drillholes

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

  • The blast holes are likely to pull to the full design depth (correct)
  • The drill rig is not capable of drilling across the entire orebody width
  • It increases the charging time for the holes
  • The angle of arc becomes exaggerated with increasing angles away from the void

    • How are Trough Undercut Blasting rings (TUCs) drilled?

  • Limited to a length of 30m
  • Using upholes inclined at 45°
  • By promoting the best rill angle at the stope drawpoints (correct)
  • Small rings that maximize the charging time

    • Why are inclined (dumped) TUC rings required in mining operations?

    <p>To minimize exposure of charge-up personnel to the slot void</p> Signup and view all the answers

    What is a significant factor in minimizing the angle of arc that drillholes are required to cover?

    <p>Using as near to parallel holes as possible across the orebody width</p> Signup and view all the answers

    What is a common design characteristic of Central Ore Shoots (COS) in narrow vein orebodies where bench stoping is practiced?

    <p>Extending across the full width of each stope</p> Signup and view all the answers

    Why is fanning of blastholes into unbroken ground to strip the slot commonly considered unsuccessful in blasting operations?

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

    What is the purpose of designing Trough Undercut Blasting rings (TUCs) with limited lengths in mining operations?

    <p>To ensure safe charging of holes</p> Signup and view all the answers

    Why are drill rigs required to be capable of drilling across the entire orebody width with near parallel holes in mining operations?

    <p>To reduce the angle of arc that drillholes need to cover</p> Signup and view all the answers

    What is a key design consideration for Trough Undercut Blasting rings (TUCs) in relation to promoting optimal drilling angles at stope drawpoints?

    <p>Shaping TUCs to protect the rock mass at the brows</p> Signup and view all the answers

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