Drilling

Quiz

1. What is a cylindrical vehicle designed and strategically situated to hold and contain an explosive charge?

2. What is the most expensive phase in the drilling and blasting portion of production?

3. What is probably the most important single factor in drilling?

4. What are some characteristics that influence hole size?

5. What are two broad categories of drilling methods?

6. Which type of drilling represents the ?hand steel and hammer? method used in mining 100 years ago and more?

7. With what combination does rock fail in rotary drilling?

8. What two configurations do bits usually take for blasthole rotary drilling?

9. What aspects should be considered when choosing a type of drill rig and drill mounting?

10. What two categories do drill mountings fall into?

Quiz Answers

1. Blasthole

2. Drilling

3. Determining hole diameter

4. Hardness and rock structure

5. Percussion and rotary

6. Percussion drilling

7. Down pressure and rotation speed

8. Drag or blade bits and roller-cone bits

9. Mobility, simplicity, reliability and mechanical availability, productivity, safety

10. Truck-mounted and track-mounted