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More Mining Engineering Questions
A thickness of the lid not less than . . . . . . . . centimeters.
Out crop of rocks surrounded by older rocks and therefore entirely separated from main mass by denudation.
Smoke helmet or hose mask works under continuous . . . . . . . . pressure.
Whose two or more seams or sections are worked in a mine, the pillars in one seam or section shall as far as practicable be vertically above or below the pillars in the same or other seam or section unless the strate are inclined at an angle of more than . . . . . . . . degree from the horizontal.
The lighting arrangements in depillaring areas in deg.I gassy mines, . . . . . . . . watt bulbs cluster if height of working in over 3 m.