sec.344Other things for which ventilation system must provide

### sec.344 Other things for which ventilation system must provide The ventilation officer for an underground mine must ensure the mine’s ventilation system provides for the following— minimising, within acceptable limits, the layering and accumulation of noxious and flammable gas in each place where controlled ventilation is required under paragraph (b) ; controlled ventilation— in each standing working place that is on the intake side of a working place; and in each working place in an ERZ1 or an ERZ0; at least— 1 entry to each working part of the mine to conduct intake air to the part; and 1 entry to each working part of the mine to conduct return air from the part; monitoring and recording the concentration of atmospheric contaminants in each place mentioned in paragraph (b) and subsection (3)(b) . Subsection (1) (a) does not apply when there is a sudden, temporary increase in the general body concentration of methane to more than 2.5% and the ventilation system is capable of quickly reducing the methane concentration to not more than 2.5%. Subsection (1) (b) does not apply to the following places— a place where controlled ventilation has failed and that is being inspected under section 307 to re-establish controlled ventilation; a heading or roadway, if control measures, other than controlled ventilation, have been implemented for minimising, within acceptable limits, the layering and accumulation of noxious and flammable gas in the heading or roadway. Subsection (1) (c) (ii) does not apply to— a shaft being sunk; or a drift or individual roadway being driven and for which it would be impracticable to provide a separate return roadway. a single entry drive or longwall face heading This section does not apply to a part of the mine exempted under section 345 . In this section— controlled ventilation , for a place, means ventilation involving a ventilation current of an average velocity of at least 0.3m/s, measured across the cross-sectional area of the roadway in the place. s 344 amd 2019 SL No. 250 s 16 ; 2020 SL No. 118 s 17 (sec.344-ssec.1) The ventilation officer for an underground mine must ensure the mine’s ventilation system provides for the following— minimising, within acceptable limits, the layering and accumulation of noxious and flammable gas in each place where controlled ventilation is required under paragraph (b) ; controlled ventilation— in each standing working place that is on the intake side of a working place; and in each working place in an ERZ1 or an ERZ0; at least— 1 entry to each working part of the mine to conduct intake air to the part; and 1 entry to each working part of the mine to conduct return air from the part; monitoring and recording the concentration of atmospheric contaminants in each place mentioned in paragraph (b) and subsection (3)(b) . (sec.344-ssec.2) Subsection (1) (a) does not apply when there is a sudden, temporary increase in the general body concentration of methane to more than 2.5% and the ventilation system is capable of quickly reducing the methane concentration to not more than 2.5%. (sec.344-ssec.3) Subsection (1) (b) does not apply to the following places— a place where controlled ventilation has failed and that is being inspected under section 307 to re-establish controlled ventilation; a heading or roadway, if control measures, other than controlled ventilation, have been implemented for minimising, within acceptable limits, the layering and accumulation of noxious and flammable gas in the heading or roadway. (sec.344-ssec.4) Subsection (1) (c) (ii) does not apply to— a shaft being sunk; or a drift or individual roadway being driven and for which it would be impracticable to provide a separate return roadway. a single entry drive or longwall face heading (sec.344-ssec.5) This section does not apply to a part of the mine exempted under section 345 . (sec.344-ssec.6) In this section— controlled ventilation , for a place, means ventilation involving a ventilation current of an average velocity of at least 0.3m/s, measured across the cross-sectional area of the roadway in the place. - (a) minimising, within acceptable limits, the layering and accumulation of noxious and flammable gas in each place where controlled ventilation is required under paragraph (b) ; - (b) controlled ventilation— (i) in each standing working place that is on the intake side of a working place; and (ii) in each working place in an ERZ1 or an ERZ0; - (i) in each standing working place that is on the intake side of a working place; and - (ii) in each working place in an ERZ1 or an ERZ0; - (c) at least— (i) 1 entry to each working part of the mine to conduct intake air to the part; and (ii) 1 entry to each working part of the mine to conduct return air from the part; - (i) 1 entry to each working part of the mine to conduct intake air to the part; and - (ii) 1 entry to each working part of the mine to conduct return air from the part; - (d) monitoring and recording the concentration of atmospheric contaminants in each place mentioned in paragraph (b) and subsection (3)(b) . - (i) in each standing working place that is on the intake side of a working place; and - (ii) in each working place in an ERZ1 or an ERZ0; - (i) 1 entry to each working part of the mine to conduct intake air to the part; and - (ii) 1 entry to each working part of the mine to conduct return air from the part; - (a) a place where controlled ventilation has failed and that is being inspected under section 307 to re-establish controlled ventilation; - (b) a heading or roadway, if control measures, other than controlled ventilation, have been implemented for minimising, within acceptable limits, the layering and accumulation of noxious and flammable gas in the heading or roadway. - (a) a shaft being sunk; or - (b) a drift or individual roadway being driven and for which it would be impracticable to provide a separate return roadway. Example for paragraph (b) — a single entry drive or longwall face heading