81. The area of working face broken per drill hole is termed as
82. The natural and geological conditions of the mineral deposit are as follows
1. ore strength : weak to moderate
2. rock strength : moderate to strong
3. deposit shape : tabular
4. dip : flat
5. depth : shallow to moderate
6. cost of mining : moderate
From the options listed below select the optimal or best suited method possible for the available conditions?
1. ore strength : weak to moderate
2. rock strength : moderate to strong
3. deposit shape : tabular
4. dip : flat
5. depth : shallow to moderate
6. cost of mining : moderate
From the options listed below select the optimal or best suited method possible for the available conditions?
83. Which of the following is in vogue to calculating depreciation?
84. Gestation period is
85. As per Indian Electricity Rules, where hand-held portable apparatus is used, the voltage should not exceed
86. Extraction to a small sized, irregular and unsystematic underground working is called
87. Chances of Over-riding of gallery is most with
88. Which of the following type of SDB is placed outbye of the face?
89. If the value of ore is Rs. 600 per tonne, production cost Rs. 400 per tonne, and cost of overburden removal Rs. 50 per m3, the break-even stripping ratio in m3/tonne is
90. Given bench height: 12 m, burden: 4 m, Spacing: 5 m; explosive per hole: 120 kg; density of rock: 2600 kg/m3, the powder factor in tonne/kg is
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