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<br />• <br />TABLE 3 <br />BLASTING PARAMETERS - OVERBURDEN <br />COAL SEAM TO UNCOVER <br />Explosive Material <br />Hole Diameter <br />Average Hole Depth <br />Hole Stem, Deck & Backfill <br />Powder Column <br />Pounds Powder Per Hole <br />(Based on ANFO @ 0.85 gm/cc) <br />Powder F3 actor <br />Bank Yd Shot Per Hole <br />Drill Pattern <br />Primer (#/Type) <br />Initiation & Delay System <br />41ADGE <br />ANFO, ANFO-AL or Emulsion <br />12-1/4" <br />80' <br />28' <br />52' <br />2185 Lb. <br />0.85 Lb/BCY <br />2560 RCY <br />24 X 36 <br />3-1 Lb. Cast Primers <br />Downhole and Surface <br />Delays with Detonating <br />Cord and Electric Cap <br />2i~ Stemming <br />Primer <br />48~ Explosives <br />Decking <br />Explosives <br />Backfill <br />TYPICAL POWDER COLUMN <br />• <br />