30 CFR § 57.22233 - Actions at 0.5 percent methane (I-C mines).
---
identifier: "/us/cfr/t30/s57.22233"
source: "ecfr"
legal_status: "authoritative_unofficial"
title: "30 CFR § 57.22233 - Actions at 0.5 percent methane (I-C mines)."
title_number: 30
title_name: "Mineral Resources"
section_number: "57.22233"
section_name: "Actions at 0.5 percent methane (I-C 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"
---
# 57.22233 Actions at 0.5 percent methane (I-C mines).
If methane reaches 0.5 percent in the mine atmosphere, ventilation changes shall be made to reduce the level of methane. Until methane is reduced to less than 0.5 percent, no other work shall be permitted in affected areas.
[52 FR 24941, July 1, 1987; 52 FR 27903, July 24, 1987]