MSHA - Code of Federal Regulations - 30 CFR 75.386
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MSHA - Title 30 CFR
30 CFR § 75.386
Final mining of pillars.

When only one mine opening is available due to final mining of pillars, no more than 20 miners at a time shall be allowed in the mine, and the distance between the mine opening and working face shall not exceed 500 feet.