61. Which shovel gives best and cheaper maintanance.
62. The out put of the shovel with 4.5 cu.m bucket is cu.m per year.
63. The minimum over burden production per day by a 10 m3 electric rope shovel with 85 tonne dumper.
64. A resistance of 9 kg of per 1000 kgf is roughly equivalent to that offered by an upgradient of . . . . . . . .%
65. Power source of locomotive in mines.
66. In which mining, have roof control or ventilation problems.
67. Environmental management plan, does not contain this aspect.
68. The stripping ratio for manual quarrying is . . . . . . . .
69. Another name of open cast mining.
70. In the operation of high wall miner, in the event of methane level concentration exceeds . . . . . . . .% it will trip the electric supply feeding to the outter unit.
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