61. If the depth of the shaft exceeds 1000 m but not 1500 m, no winding rope shall be used or continued to use, if its factor of safety is becomes less than . . . . . . . . in metal mines.
62. In cut and fill stoping is done by . . . . . . . .
63. The method of stoping suitable to extract thick ore body strong ore, stable handling and footwall steeply dipping ore is . . . . . . . .
64. The friable rock in cut and fill method is supported by . . . . . . . .
65. The number of persons required for collection of samples in u/g.
66. The sublevel interval does not depend on in metal mines.
67. In this method of stoping the large diameter downward parallel holes drilled for blasting.
68. The channel sampling is applicable in . . . . . . . . to collect samples.
69. In India Alimak Raise climber introduced first time in which mine.
70. The technique of VRM is different from long hole mining from the point of view off
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