30 CFR § 75.1711-3 - Openings of active mines.

---
identifier: "/us/cfr/t30/s75.1711-3"
source: "ecfr"
legal_status: "authoritative_unofficial"
title: "30 CFR § 75.1711-3 - Openings of active mines."
title_number: 30
title_name: "Mineral Resources"
section_number: "75.1711-3"
section_name: "Openings of active mines."
chapter_name: "MINE SAFETY AND HEALTH ADMINISTRATION, DEPARTMENT OF LABOR"
subchapter_number: "O"
subchapter_name: "COAL MINE SAFETY AND HEALTH"
part_number: "75"
part_name: "MANDATORY SAFETY STANDARDS—UNDERGROUND COAL MINES"
positive_law: false
currency: "2026-03-24"
last_updated: "2026-03-24"
format_version: "1.1.0"
generator: "[email protected]"
authority: "30 U.S.C. 811, 813(h), 957."
regulatory_source: "35 FR 17890, Nov. 20, 1970, unless otherwise noted."
cfr_part: "75"
---


# 75.1711-3 Openings of active mines.

The openings of all mines not declared by the operator, to be inactive, permanently closed, or abandoned for less than 90 days shall be adequately fenced or posted with conspicuous signs prohibiting the entrance of unauthorized persons.