5 Questions
What is the primary function of a COS in the in-stope extraction sequence?
To provide the initial void for subsequent rings
Why might slightly wider rings be fired into the initial slot adjacent to a COS?
To gain additional ground
What may necessitate the inclusion of an additional COS in a stope?
An increase in orebody width
Why is fanning of blastholes into unbroken ground to strip the slot usually unsuccessful?
Blast holes are unlikely to pull to the full design depth
What does a drill rig need to be capable of in order to minimize the angle of arc that the drillholes cover?
Drilling parallel holes across the orebody width
Learn about the importance of Cutoff Slots (COS) in the in-stope extraction sequence and how they provide the initial void for subsequent rings. Understand how wider orebody sections may require additional COS for efficient extraction.
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