21. In a cut-and-fill stope, the main purpose of back filling is to
22. Maximum Lump size that can be conveyed by belt conveyer is
23. How much time a dragline may take to complete a cycle for a single pass?
24. A narrow vertical or inclined excavation made in the ore block along the width and the height of a stope to continue stoping is termed as
25. Two coal seams are called contiguous if they are A m (maximum) apart from each other. A is given by
26. The sale value of chromite ore from an open pit mine is Rs. 6500 per tonne. Cost of mining, excluding stripping cost, is Rs. 2450 per tonne. If the cost of stripping is Rs. 1150 per m3, the breakeven stripping ratio in m3/tonne is
27. From a hard rock open pit mine, the following data available
Burden : 3 m
Spacing : 4 m
Bench height : 12 m
Sub-drilling : 1 m
Collar stemming : 4 m
Diameter of hole : 150 mm
Density of rock : 2500 kg/m3
Density of explosive : 800 kg/m3
The powder factor in kg/t is
Burden : 3 m
Spacing : 4 m
Bench height : 12 m
Sub-drilling : 1 m
Collar stemming : 4 m
Diameter of hole : 150 mm
Density of rock : 2500 kg/m3
Density of explosive : 800 kg/m3
The powder factor in kg/t is
28. As per the Indian Electricity Rules 1956. the maximum permissible length of a flexible cable used with an electric rope shovel in m is
29. The slope angle for hard and compact ground should not be more than
30. The opening cut in open cast mining is known as
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