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Mining Engineering Drilling And Blasting Difficulty: Medium

Class 8 group explosives are

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The washers used in flame safety lamp made of . . . . . . . . 'T'h'e' 'h'e'i'g'h't' 'o'f' 'a'n'y' 'b'e'n'c'h' 's'h'a'l'l' 'n'o't' 'e'x'c'e'e'd' '.' '.' '.' '.' '.' '.' '.' '.' 'm' 'i'n' 'm'a'n'u'a'l' 'o'p'e'n'c'a's't' 'm'i'n'i'n'g' As per Mines Act 1952, the periods of work of any adult employee above ground shall not be more than "A" hours along with his interval for rest and he shall not work for more than "B" hrs continuously before he has had an interval of rest for at least 30 minutes. A and B are given by Coal more liable to spontanious heating when thesebands present The path of a typical ball mill in a ball mill is