9. Development Drilling

Question 1

What are the limitations of diesel?

Answer 1

ventilation and handling

Question 2

What are the limitations of electric?

Answer 2

location requirements

Question 3

What are the 3 principle drilling applications for underground mining?

Answer 3

1. development blasting
2. production blasting
3. contour control blasting

Question 4

What is the acceptable deviation of burden?

Answer 4

10%

Question 5

Back Holes

Answer 5

row of holes along the back or roof line

Question 6

Side Holes

Answer 6

holes along the side or ribs of the drift

Question 7

Easers

Answer 7

holes immediately surrounding the cut holes

Question 8

What are 3 rules of thumb for cablebolt installation?

Answer 8

1. accurate on drill holes
2. equipment must drill and clear cuttings in all holes
3. minimum wall rock damage

Question 9

What are the 4 raise technics?

Answer 9

1. Alimak
2. Blind Hole Boring
3. Reaming
4. Drop Raise

Question 10

Cutouts

Answer 10

odd shaped openings

Question 11

Sub-Drilling

Answer 11

drilling below the floor level