30 CFR § 57.22608 - Secondary blasting (I-A, II-A, and V-A mines).

---
identifier: "/us/cfr/t30/s57.22608"
source: "ecfr"
legal_status: "authoritative_unofficial"
title: "30 CFR § 57.22608 - Secondary blasting (I-A, II-A, and V-A mines)."
title_number: 30
title_name: "Mineral Resources"
section_number: "57.22608"
section_name: "Secondary blasting (I-A, II-A, and V-A 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"
---


# 57.22608 Secondary blasting (I-A, II-A, and V-A mines).

Prior to secondary blasting, tests for methane shall be made in the mine atmosphere at blast sites by a competent person. Secondary blasting shall not be done when 0.5 percent or more methane is present.