Angle (90-BFA)30°
Pre-split Hole Length11.55 m
Total Hole Length (+subdrill)12.05 m
Charge Length10.55 m
Charge Diameter44.5 mm
Explosive per metre1.87 kg/m
Total explosive/hole19.68 kg
Holes per linear metre1.25
Explosive per linear m wall24.61 kg/m
Formula
Pre-split Hole Length = Bench Height / cos(90° - BFA)
= 10 / cos(30°) = 11.55 m
Charge Dia = Hole Dia x Decouple = 89 x 0.5 = 44.5mm
Exp/m = π × (ChgDia/2)² × density = 1.87 kg/m
Total = Exp/m × Charge Length = 1.87 × 10.55 = 19.68 kg