Queensland Consolidated Regulations

COAL MINING SAFETY AND HEALTH REGULATION 2017 - REG 289

289 NERZ

(1) An underground mine, or any part of an underground mine, where the general body concentration of methane is known to be, or is identified by a risk assessment as likely to be, less than 0.5% is a negligible explosion risk zone (a
"NERZ" ).

(2) Without limiting subsection (1) , a part of the mine submerged by water is a NERZ.

(3) A NERZ may be divided into sub-zones to enable discrimination to be applied to tripping of the electricity supply to electrical circuits caused when gas detectors detect a general body concentration of methane of 0.5%.

(4) Each sub-zone mentioned in subsection (3) is a NERZ.

(5) Nothing in this section prevents the underground mine manager for an underground mine from classifying a NERZ at the mine as an ERZ0 or ERZ1.

(6) If an underground mine manager makes a classification under subsection (5) , the NERZ is taken, while the classification is in force, to be an ERZ of the type stated in the classification.