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More Mining Engineering Questions
In extraction of coal pillars by caving, what should be the maximum area of roof exposure at any working place at any time.
When methane is burnt two gasses are formed with a blue flame. Name the gases.
For coal seam having more inclination, shaft may be located in . . . . . . . . property.
The degree of accuracy in chain survey under average condition is . . . . . . . .
For a frequency of vibration 3 - 300 cycle/sec the PPV safe for structure is