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Questions and Answers
What is the typical diameter range for the upholes drilled in Trough Undercut Blasting (TUC) design?
What is the typical diameter range for the upholes drilled in Trough Undercut Blasting (TUC) design?
- 110–129 mm
- 50–69 mm
- 70–89 mm (correct)
- 90–109 mm
Why are Trough Undercut Blasting (TUC) rings designed to be small?
Why are Trough Undercut Blasting (TUC) rings designed to be small?
- To increase the exposure of charge-up personnel
- To maximize the charging time
- To decrease the protection of the rock mass at the brows
- To promote optimal rill angle at the stope drawpoints (correct)
Why are Trough Undercut Blasting (TUC) rings inclined (dumped)?
Why are Trough Undercut Blasting (TUC) rings inclined (dumped)?
- To minimize charging time and exposure of charge-up personnel
- To allow conventional blow-loading of explosives
- To facilitate charging of holes at the edge of a stope (correct)
- To increase the protection of the rock mass at the brows
What is the maximum length limit for Trough Undercut Blasting (TUC) upholes?
What is the maximum length limit for Trough Undercut Blasting (TUC) upholes?
What is the purpose of shaping Trough Undercut Blasting (TUC) to promote the best rill angle?
What is the purpose of shaping Trough Undercut Blasting (TUC) to promote the best rill angle?
Why are Trough Undercut Blasting (TUC) rings limited to a length of 15 m?
Why are Trough Undercut Blasting (TUC) rings limited to a length of 15 m?
What is the significance of drilling TUC upholes at an inclination of 70 degrees?
What is the significance of drilling TUC upholes at an inclination of 70 degrees?
Why are Trough Undercut Blasting (TUC) rings designed to be small?
Why are Trough Undercut Blasting (TUC) rings designed to be small?
What is the purpose of requiring inclined (dumped) TUC rings?
What is the purpose of requiring inclined (dumped) TUC rings?
What is the diameter range for the upholes drilled in Trough Undercut Blasting (TUC) design?
What is the diameter range for the upholes drilled in Trough Undercut Blasting (TUC) design?
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