31. The nature support given to the strata in the following stoping method artificially.
32. The deposits must not exceed 5 - 6 m thickness, though 3m is considered to be economic limit in . . . . . . . . stoping.
33. The method of stoping is applied for massive deposits of large horizontal extent.
34. Overall recovery from thick seam with preventive technique of mining in Indian condition is . . . . . . . .
35. Froth floatation is used for . . . . . . . .
36. The stoping suitable to extract thin ore bodies flat dip, both ore and wells are strong.
37. Which blast indicator of an explosive shows its ability to break solid hard rock.
38. In raise drilling, the drill machine normally operated by a crew of . . . . . . . . men.
39. The mining method in which masses, panels of ore are under cut to induce caving, permitting the broken ore to be drawn off below.
40. Can we use the crater blasting in under ground mines?
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