51. In Indian long wall mines, support resistance is calculated with due consideration to
52. 'Gravimetric Dust Sampler' is
53. As per CMR 2017, the "Automatic Contrivance" shall be provided in each shaft exceeding a depth of
54. The feasibility study of an opencast mine revealed the following:
Recoverable value per tonne of ore = Rs. 900
Production cost per tonne of ore = Rs. 550
Stripping cost per tonne of waste = Rs. 45
The break even stripping ratio will be
Recoverable value per tonne of ore = Rs. 900
Production cost per tonne of ore = Rs. 550
Stripping cost per tonne of waste = Rs. 45
The break even stripping ratio will be
55. Match the following in the context of Indian mining practice:
Equipment
Power source
a. Rocker shovel
1. Battery
b. Locomotive
2. Compressed air
c. Shearer
3. Electricity (Maximum voltage 6.6 kV AC)
d. Dragline (24 m3 bucket capacity)
4. Electricity (Maximum voltage 1.1 kV AC)
| Equipment | Power source |
| a. Rocker shovel | 1. Battery |
| b. Locomotive | 2. Compressed air |
| c. Shearer | 3. Electricity (Maximum voltage 6.6 kV AC) |
| d. Dragline (24 m3 bucket capacity) | 4. Electricity (Maximum voltage 1.1 kV AC) |
56. The process of extraction of soluble metal compounds by reaction with acid or basic solvents or water is called
57. Why the heavy type of stone dust barriers are located further from faces in a district
58. In longwall caving, the thickness of immediate roof is calculated from
59. An underground panel extracted in a coal mine has a strike length of 500 m. After subsidence survey, it was found that the length of a straight line between the extreme limits of the subsided area on surface is 593.2 m along the strike direction. The depth of the extracted panel from the surface is 100 m. The angle of draw for the overlying strata assuming identical subsidence on either side of the centre of the panel is
60. When an underground gallery is driven, the equilibrium of pre-mining forces is disturbed and re-distribution of pressures takes place. This can be better-explained by
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