MSHA - Code of Federal Regulations - 30 CFR 57.3000
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MSHA - Title 30 CFR

30 CFR § 57.3000

The following definitions apply in this subpart.

Rock burst. A sudden and violent failure of overstressed rock resulting in the instantaneous release of large amounts of accumulated energy. Rock burst does not include a burst resulting from pressurized mine gases.

Travelway. A passage, walk, or haulageway regularly used or designated for persons to go from one place to another.