CFR›Title 30›Chapter I›Part 57›Subpart B›Subject Group Precautions—Underground Only ContainsSections 57.3460–57.3461CorpusDaily eCFRDisplayed edition2026-04-24Last updated2026-04-24 Sections 57.3460 § 57.3460 Maintenance between machinery or equipment and ribs. 57.3461 § 57.3461 Rock bursts. Previous Precautions—Surface Only Precautions—Surface Only Next Scaling and Support—Surface and Underground Scaling and Support—Surface and Underground