sec.343Ventilation system must provide for general body concentrations for particular contaminants and gases

### sec.343 Ventilation system must provide for general body concentrations for particular contaminants and gases The ventilation officer for an underground mine must ensure the mine’s ventilation system is designed, implemented and monitored to ensure the atmosphere in each part of the mine has a general body concentration that is— for a contaminant mentioned in schedule 6 , column 1—as low as reasonably achievable and within the limits to which a person is allowed to be exposed under section 359 ; and for oxygen—at least 19%; and for methane—not more than 2.5%; and for carbon dioxide—as low as reasonably achievable and within the limits to which a person is allowed to be exposed under section 360 . The ventilation officer must ensure— a record is made of the results of monitoring the ventilation system under subsection (1) for the atmospheric contaminants and gases mentioned in the subsection; and the record is kept for 7 years after it is made. The ventilation officer must also ensure that, if the general body concentration of methane in the mine exceeds 2.5% (a methane event )— a record is made of— the day, time and duration of the methane event; and the part of the mine in which the methane event happened; and the record is kept for 7 years after the day the methane event happened. This section does not apply to a part of the mine exempted under section 345 . s 343 amd 2019 SL No. 250 s 15 (sec.343-ssec.1) The ventilation officer for an underground mine must ensure the mine’s ventilation system is designed, implemented and monitored to ensure the atmosphere in each part of the mine has a general body concentration that is— for a contaminant mentioned in schedule 6 , column 1—as low as reasonably achievable and within the limits to which a person is allowed to be exposed under section 359 ; and for oxygen—at least 19%; and for methane—not more than 2.5%; and for carbon dioxide—as low as reasonably achievable and within the limits to which a person is allowed to be exposed under section 360 . (sec.343-ssec.2) The ventilation officer must ensure— a record is made of the results of monitoring the ventilation system under subsection (1) for the atmospheric contaminants and gases mentioned in the subsection; and the record is kept for 7 years after it is made. (sec.343-ssec.3) The ventilation officer must also ensure that, if the general body concentration of methane in the mine exceeds 2.5% (a methane event )— a record is made of— the day, time and duration of the methane event; and the part of the mine in which the methane event happened; and the record is kept for 7 years after the day the methane event happened. (sec.343-ssec.4) This section does not apply to a part of the mine exempted under section 345 . - (a) for a contaminant mentioned in schedule 6 , column 1—as low as reasonably achievable and within the limits to which a person is allowed to be exposed under section 359 ; and - (b) for oxygen—at least 19%; and - (c) for methane—not more than 2.5%; and - (d) for carbon dioxide—as low as reasonably achievable and within the limits to which a person is allowed to be exposed under section 360 . - (a) a record is made of the results of monitoring the ventilation system under subsection (1) for the atmospheric contaminants and gases mentioned in the subsection; and - (b) the record is kept for 7 years after it is made. - (a) a record is made of— (i) the day, time and duration of the methane event; and (ii) the part of the mine in which the methane event happened; and - (i) the day, time and duration of the methane event; and - (ii) the part of the mine in which the methane event happened; and - (b) the record is kept for 7 years after the day the methane event happened. - (i) the day, time and duration of the methane event; and - (ii) the part of the mine in which the methane event happened; and