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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
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