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Determine concentration of fumes after they have


Blast fume clearance time

For the following

Face dimensions 5 m high by 5 m wide

Face advance 4 m

Length of development before blast 700m

Rock density 2.7 tonnes/m3

ANFO factor 2 kg/m3 rock broken

Face ventilation 22 m3/s

NO2­­ gas production rate 3.5 kg per tonne of ANFO

NO2 TWA is 3 ppm

Determine

  1. Volume of rock to be blasted
  2. Tonnes of rock to be blasted
  3. ANFO used
  4. Fume throw back distance
  5. Volume of fumes immediately after the blast
  6. Volume of NO2 gas produced
  7. Concentration of NO2 in fume throw back zone immediately after the blast
  8. Concentration of fumes after they have spread throughout the drive but before they have entered the decline
  9. Time for diluted fumes to fill the drive
  10. Time for fumes to be diluted below TWA concentration
  11. Total time for fumes to clear

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