ABSTRACT
Depending upon rock types and their condition, spacing and burden is being varied. Typical drill & blast design parameters are as under.
Spacing and Burden
Waste : 5-6 m × 4 m Ore : 3 m × 3 m Depth of Hole : 11-12 m Sub Grade : 1.0-1.25 m Primary Charge : 400 g cast booster (Waste)
500 g emulsion booster (Ore)
Column Charge : Site Mixed Emulsion (Bulk) Charge Length : 66-70% of hole depth Charge per hole : 170 to 190 kg Drill Pattern : Mostly staggered Blast Pattern : Reverse Echelon MCPD : 500 kg. Powder Factor : 3.7 t/kg (Waste)
1.7 t/kg (Ore) Holes per round: 60-200 holes
The mine is currently working up to a depth of 250 m from surface (Figure 1). Towing in the line of world class mines, its slopes are monitored by Slope stability Radar.
