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Air samples collected from the intake and the return gates of a retreating longwall face show methane concentration values of 0.1% and 0.8% respectively. The production from the longwall face is 2000 tonne/day and the air quantity circulating the face is 15 m 3 /s. The rate of methane emission in m 3 per tonne of coal produced is
Which type drill bit suitable for soft rock
In this system the right hand ordinary lay wire rope is useful.
'T'h'e' 't'e'm'p'e'r'a't'u'r'e' 'o'f' 't'h'e' 'w'h'i't'e' 'm'e't'a'l' 'w'h'e'n' 'p'o'u'r'e'd' 'i'n' 'a' 's'o'c'k'e't' 's'h'a'l'l' 'n'o't' 'e'x'c'e'e'd' '.' '.' '.' '.' '.' '.' '.' '.' 'd'e'g'r'e'e' 'c'e'n't'i'g'r'a'd'e'
Pop shooting or plaster shooting is a type of