41. Scraper blade cuts the earth usually between 75 mm and 225 mm thick over a distance of nearly . . . . . . . .
42. Machine used for excavation and removal of soft unconsolidated strata, in soft ore or benches upto 90 m.
43. The bucket capacity of tracter shovel.
44. Hydraulic wagon drill can drill holes of diameter ranges from . . . . . . . .
45. Toppling up of benches is due to
46. 24 m3 bucket capacity drag line run by . . . . . . . .
47. Mining and marketing of coal called . . . . . . . .
48. The toe problem may be arised in . . . . . . . .
49. To open a mine for deep seated, the cut use is
50. High wall miner filled with a . . . . . . . . sensor which measures the % of . . . . . . . . and displays the same in monitor being kept in front of the operator at the surface.
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