Used to reduce overbreak and minimise the fracturing of the rock of the boundary of an excavation


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Used to reduce overbreak and minimise the fracturing of the rock of the boundary of an excavation

  • Used to reduce overbreak and minimise the fracturing of the rock of the boundary of an excavation



2)Presplitting

      • 2)Presplitting
      • Dia of hole - 50 to 100mm
      • Spacing – 6 to 12 dia
      • Explosives- spring loaded on detonating chord
      • Depth upto 15.0m
      • 3)Cushion blast
      • Dia of hole - 50 to 150mm
      • Depth upto 30.0m
      • 4)Smooth blast
















No operating equipment within 50 feet of loaded holes

  • No operating equipment within 50 feet of loaded holes

  • Load only those holes intended to be fired in the next round

  • Warning signs posted

  • Check all holes for

  • depth prior to loading















The detonation of three different ammonium nitrate-fuel oil (ANFO) mixture illustrates the principle of oxygen balance.

  • The detonation of three different ammonium nitrate-fuel oil (ANFO) mixture illustrates the principle of oxygen balance.

  • 1) 94.5% AN-5.5% FO( Oxygen balanced)

    • 3NH4NO3 + CH2 = 7H2O+CO2+3N2+ 930Kcal/Kg
  • 2) 92% AN-8.0% FO( Fuel excess)

    • 2NH4NO3 + CH2 = 5H2O+CO+2N2+ 810Kcal/Kg
  • 3) 96.6% AN-3.4% FO( Fuel shortage)

    • 5NH4NO3 + CH2 = 11H2O+CO2+4N2+2NO+ 600Kcal/Kg


HIT INJURY BY PROJECTILES





NOT TO USE

  • NOT TO USE

  • MOBILE / CELL PHONE

  • HAND SETS &

  • WELDING







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