The support in shrikage stoping is . . . . . . . .
A. Insitu pillar
B. Broken are
C. Timber mat
D. None
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If the stoping started on eiqhter side of rise winze connection called . . . . . . . .
A. Single stoping
B. Double stoping
C. Multiple stoping
D. Back stoping
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The stoping method selected, where ore body is thick veins type ore and walls are strong and steeply dipping ore i.e. footwall steeper than angle of repose of broken ore is . . . . . . . .
A. Open stoping
B. Shrinkage stoping
C. Cut and fill
D. Sub level stoping
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Grizzly is used in ore bin to prevent.
A. Falling of ore
B. Bigger size ore from entering the bin
C. Spillage of ore
D. Loading of skip
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Alimak raise climber introduced in India first time in the year . . . . . . . .
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The method employed, if the ore body is strong steeply dipping with strong host rock.
A. Room and pillar
B. Square set
C. Sub level
D. Cut and fill
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The method of drop raising is an improvement over the method of raising through . . . . . . . .
A. Open
B. Jora
C. Long hole
D. Compartment
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Mineral hoisting in one lift can be done upto the depth not exceeding . . . . . . . . meters.
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The vertical distance between two levels called as . . . . . . . .
A. Length of back
B. Level interval
C. Stope level
D. None
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Compressibility of sand fill by hydraulic stowing is . . . . . . . .
A. 10 - 15%
B. 15 - 20%
C. 20 - 30%
D. None
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In the form of a square pyramid blasted material of 7368 m3 by volume is accommodated. The height of the pyramid is 2.4 m. Calculate surface area in m2
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It is the mining method in which masses, panels or blocks of ore are under cut to induce caving, permetting the broken ore to be drawn off below.
A. Sub level caving
B. Integral caving
C. Block caving
D. Blasting gallery
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An arrangement that prevents oversized rock to pass.
A. Draw point
B. Ore bin
C. Grizzley
D. Rise
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The method of stoping selected in strong to weak, fairly steep are with weak host rock.
A. Square set
B. Cut and fill
C. Breast
D. Sub level
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The level roadways are dipping at a mild gredient between . . . . . . . .
A. 1 in 50 and 1 in 75
B. 1 in 100 and 1 in 150
C. 1 in 4 and 1 in 3
D. 1 in 10 and 1 in 20
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Channel sampling also called . . . . . . . .
A. Grab sampling
B. Bulk sampling
C. Groove
D. Chip sampling
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In cut and fill stope the main purpose of back filling is to . . . . . . . .
A. Reduce are dilution
B. Prevent high stress concentrations
C. Prevent displacement due to dilation of fractured wall rock
D. Improve ore re-handling
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A small portion of the ore body collected and analysed to estimate the average mineral content of the ore body called . . . . . . . .
A. Sampling
B. Assaying
C. Grooving
D. All the above
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Stoping is always started on each side of . . . . . . . . direction.
A. Winze
B. Rise
C. Rise-winze
D. Stope
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Cut and fill stoping can be done by . . . . . . . .
A. Under hand method
B. Over hand method
C. Caving method
D. All the above
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