---
kind: "section"
citation: "30 C.F.R. § 57.22239"
title: "30"
number: "57.22239"
heading: "Actions at 2.0 percent methane (IV mines)."
url: "https://uscodex.org/cfr/30/57.22239"
---

# §57.22239. Actions at 2.0 percent methane (IV mines).


If methane reaches 2.0 percent in the mine atmosphere, all persons other than competent persons necessary to make ventilation changes shall be withdrawn from the mine until methane is reduced to less than 0.5 percent. MSHA shall be notified immediately.


## Notes

### Amendments

[52 FR 24941, July 1, 1987, as amended at 52 FR 41397, Oct. 27, 1987; 60 FR 33723, June 29, 1995]

### Authority

Authority: 30 U.S.C. 811.

### Source

Source: 52 FR 24941, July 1, 1987, unless otherwise noted.

### Authority

Authority: 30 U.S.C. 811.

### Source

Source: 50 FR 4082, Jan. 29, 1985, unless otherwise noted.

### Amendments

[52 FR 24941, July 1, 1987, as amended at 52 FR 41397, Oct. 27, 1987; 60 FR 33723, June 29, 1995]