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The burden, spacing, stemming, type of explosive material, blast-hole diameter and depth, powder factor and sub-drilling are all controllable variables.

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i A NOVEL POWDER FACTOR BASED BENCH BLAST DESIGN METHOD FOR LARGE SURFACE COAL MINES by ANDREW CLIFFORD BLAIR A DISSERTATION Presented to the Graduate Faculty of the

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Powder Factor is defined as the amount of explosive required to dislodge and fragment 1 cubic yard of rock. [3]

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