11. The starting point of shaft at ground surface called
12. Caisson methods are classified in to
13. Rock roller bits drills makes holes diameter between
14. Double tube core barrel improves
15. Which portion of pipe damaged more in sand stowing.
16. In a cluster number of bulbs provided in sinking shaft
17. The seam thickness in room and pillar mining may be
18. Bumps occur due to
19. The term drilling is now a days coming into use for
20. Seams with dirt bands worked by
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