In connection with lowering or raising of persons by means of bucket etc for a shaft exceeding 'A' m depth, there shall be significant cover overhead for protection from things falling down the shaft A is given by . . . . . . . .
A. 130 m
B. 190 m
C. 270 m
D. 480 m
Answer: Option A
This Question Belongs to Mining Engineering >> Mining Machinery
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