Q88
What is the purpose of pre-splitting in underground development?
A.
Increasing fragmentation
B.
Enhancing ore recovery
C.
Controlled wall breakage
AnswerD.
Increasing blast radius
Answer: Option C
Solution
Answer: Option C
Solution:
Pre-splitting involves drilling closely spaced holes along the boundary of excavation.The correct answer is: Controlled wall breakageIt reduces overbreak and maintains stable tunnel walls.Used before main blasting.