21. The type of drill bit suitable for any type of rock
22. In shallow seams to prevent breathing of air to depillared area through cracks to the surface the cracks have to be blanketted with a minimum thickness of layer of sand or earth nearly
23. When the mineral extracted from underground the void filled with incombustable material, the process called as . . . . . . . .
24. Roads driven parallel to strike in horizon mining tailed
25. The tensile strength of C.I. pipes having
26. The method employed, when surface buildings cannot be evacuated
27. Strong roof and unyielding floor tends to
28. The width of rooms in room and pillar mining
29. Among permitted and non permitted explosive, which type of explosive has highest consumption in India.
30. Thawing means
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