30 CFR § 57.22235 - Actions at 1.0 percent methane (I-C, II-A, II-B, and IV mines).

---
identifier: "/us/cfr/t30/s57.22235"
source: "ecfr"
legal_status: "authoritative_unofficial"
title: "30 CFR § 57.22235 - Actions at 1.0 percent methane (I-C, II-A, II-B, and IV mines)."
title_number: 30
title_name: "Mineral Resources"
section_number: "57.22235"
section_name: "Actions at 1.0 percent methane (I-C, II-A, II-B, and IV mines)."
chapter_name: "MINE SAFETY AND HEALTH ADMINISTRATION, DEPARTMENT OF LABOR"
subchapter_number: "K"
subchapter_name: "METAL AND NONMETAL MINE SAFETY AND HEALTH"
part_number: "57"
part_name: "SAFETY AND HEALTH STANDARDS—UNDERGROUND METAL AND NONMETAL 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."
regulatory_source: "50 FR 4082, Jan. 29, 1985, unless otherwise noted."
cfr_part: "57"
---


# 57.22235 Actions at 1.0 percent methane (I-C, II-A, II-B, and IV mines).

(a) If methane reaches 1.0 percent in the mine atmosphere, all persons other than competent persons necessary to make ventilation changes shall be withdrawn from affected areas until methane is reduced to less than 0.5 percent.

(b) If methane reaches 1.0 percent at a work place and there has been a failure of the main ventilation system, all persons shall be withdrawn from the mine.