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CFR > Title 30 - Mineral Resources > CHAPTER I—MINE SAFETY AND HEALTH ADMINISTRATION, DEPARTMENT OF LABOR > SUBCHAPTER K—METAL AND NONMETAL MINE SAFETY AND HEALTH (parts 56 to 58) > PART 57—SAFETY AND HEALTH STANDARDS—UNDERGROUND METAL AND NONMETAL MINES > SUBPART S—Miscellaneous (§57.20001 to §57.20032) > 57.20020—Unattended mine openings.
57.20020—Unattended mine openings.
Access to unattended mine openings shall be restricted by gates or doors, or the openings shall be fenced and posted.