PRB Infrastructure

A pattern of parallel Blast Holes is drilled into the rock face at the end of the drift. The diameter of these holes ranges from 38 to 64 mm (1.5 to 2.5 inches), but in general one or more larger-diameter uncharged holes are also drilled as part of the initial opening. These latter serve as free surface for the other holes to

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S-3, 2nd Floor, Ratan Height Medical Square,, Nagpur - 440009,
Maharashtra, India.

PRB Infrastructure (Owner)