9. Development Drilling Flashcards
1
Q
What are the limitations of diesel?
A
ventilation and handling
2
Q
What are the limitations of electric?
A
location requirements
3
Q
What are the 3 principle drilling applications for underground mining?
A
- development blasting
- production blasting
- contour control blasting
4
Q
What is the acceptable deviation of burden?
A
10%
5
Q
Back Holes
A
row of holes along the back or roof line
6
Q
Side Holes
A
holes along the side or ribs of the drift
7
Q
Easers
A
holes immediately surrounding the cut holes
8
Q
What are 3 rules of thumb for cablebolt installation?
A
- accurate on drill holes
- equipment must drill and clear cuttings in all holes
- minimum wall rock damage
9
Q
What are the 4 raise technics?
A
- Alimak
- Blind Hole Boring
- Reaming
- Drop Raise
10
Q
Cutouts
A
odd shaped openings
11
Q
Sub-Drilling
A
drilling below the floor level
