107. Every battery locomotive shall be equipped with a methanometer that gives a visual warning to the operator of the locomotive when the concentration of methane gas reaches 1 per cent.

• 108. (1) Every charging station underground shall be

  • (a) equipped with an automatic fire suppression system; and

  • (b) vented directly into the return airway.

• (2) The employer shall, at least 90 days before the construction of a charging station begins, submit to the Coal Mining Safety Commission for approval

  • (a) a plan of the coal mine showing the location of the charging station;

  • (b) a ventilation plan showing air-flow directions and quantities in respect of the charging station;

  • (c) detailed specifications for the charging equipment; and

  • (d) a general arrangement drawing of the charging station showing the location of the charging equipment and other electrical equipment.

109. Where reasonably practicable, main intake and return airways shall be separated by not less than 30 m of natural strata.

• 110. (1) All underground portions of a coal mine shall be ventilated in such a manner that

  • (a) dangerous concentrations of flammable or noxious gases are prevented;

  • (b) the concentration of respirable dust in the air does not exceed the levels referred to in section 111;

  • (c) as far as is practicable, air is not recirculated;

  • (d) the oxygen in the general body of the air exceeds 19 per cent; and

  • (e) the quantity of air circulating dilutes the concentration of carbon dioxide to less than 1.25 per cent.

• (2) Where the concentration of flammable gas in the general body of the air in the intake airway to a working face, measured at a location not more than 100 m from that face, exceeds 0.5 per cent, the employer shall

  • (a) report that fact to a safety officer at the district office; and

  • (b) stop all activities in the section until the concentration is reduced to less than 0.5 per cent.

• 111. (1) For the purposes of this section and section 112, the concentration of respirable dust in the air shall be measured from respirable dust samples taken by a MRDE Cassella 113A respirable dust sampling instrument or an instrument that has been calibrated to duplicate the results of the MRDE Cassella 113A.

• (2) The concentration of respirable dust in the air underground shall not exceed the following levels:

  • (a) in a longwall section,

    • (i) 3 mg/m³, measured at any location 70 m from the longwall face in the intake airway, and

    • (ii) 6 mg/m³, measured at any location 70 m from the longwall face in the return airway; and

  • (b) in a development roadway,

    • (i) 5 mg/m³, where the coal extracted is greater than 70 per cent of the total material extracted, measured at any location at the face of the roadway, and

    • (ii) 3 mg/m³, where the non-coal material extracted is greater than 30 per cent of the total material extracted, measured at any location at the face of the roadway.