Surface Environment, Mine Ventilation and Underground Hazards · Mine Ventilation · 1 mark · Numerical answer
A panel has 50 workers, each consuming oxygen at 2.5×10⁻³ m³/min. Intake oxygen is 20.95%. Find the ventilating air supply in m³/min needed to maintain the CMR2017 minimum return oxygen, to two decimals.
Use the specified minimum oxygen fraction of 19%. Total consumption is 50×0.0025 = 0.125 m³/min. With the usual dilute-gas constant-air-volume balance, Q(0.2095−0.19) = 0.125. Thus Q = 6.41026 m³/min, or 6.41. This is the oxygen-consumption calculation, not a separate statutory per-person ventilation-rate calculation.
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