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More Mining Engineering Questions
In a 4.2 m wide and 3.0 m high gallery in a coal seam, twelve shot holes are blasted per round. The holes are charged with 2 explosive cartridges of 435 g each. If the powder factor of the blast is 2.2 tonne/kg and specific gravity of coal is 1.4, the pull per round of blast in m is
Escaped water from weep holes collected in . . . . . . . . at the curbs.
The advantage of a prism in a prismatic compass is . . . . . . . .
Which of the following is NOT a common hazard in shaft sinking?
For a curve of radious 100m and normal chord 10m, the Rankine's deflection angle is