61. It is such part of a mine below ground as has an independent intake airway commencing from a main in take airway and an independent return airway terminating at main return airway and incase of a mine or part there of which is ventilated by natural means, the whole mine or part
62. Practical experience and training in coal mine required for appearing sirdar certificate of examination for a period of not less than . . . . . . . . years.
63. Act means the mines act 1952 the section is
64. The width of manhole not less than . . . . . . . . m.
65. A person appointed to superintend the rising and lowering of persons, tools and materials, transmit signals at any inset or shaft bottom . . . . . . . .
66. A natural gas recovered from a coal mine or part there of called.
67. First class mine manager's certificate granted under regulation . . . . . . . .
68. Where the inclination of the travelling roads exceeds . . . . . . . . degree from horizontal be provided in additional to steps with suitable platform are to be provided.
69. Between the centre of the hole for attaching the detaching hook to the rope shackle and bell plate, when the bucket is at the top of landing, there shall be clear over run space of not less than . . . . . . . . meters.
70. The height of benches in coal or over burden in rock formation shall not be more than . . . . . . . . in mechanism open cast mine.
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