### sec.334 Preventing explosive atmospheres around operating machines The underground mine manager for an underground mine must ensure that, while a blind shaft, raise or tunnel borer is operating in a shaft or tunnel at the mine— the methane content in the shaft or tunnel does not exceed 2%; or the shaft or tunnel has an inert atmosphere. - (a) the methane content in the shaft or tunnel does not exceed 2%; or - (b) the shaft or tunnel has an inert atmosphere.

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Section sec.334 - Coal Mining Safety and Health Regulation 2017 - Preventing explosive atmospheres around operating machines — Zoe