30 CFR § 57.22106 - Dust containing volatile matter (I-C mines).

---
identifier: "/us/cfr/t30/s57.22106"
source: "ecfr"
legal_status: "authoritative_unofficial"
title: "30 CFR § 57.22106 - Dust containing volatile matter (I-C mines)."
title_number: 30
title_name: "Mineral Resources"
section_number: "57.22106"
section_name: "Dust containing volatile matter (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"
---


# 57.22106 Dust containing volatile matter (I-C mines).

Dust containing volatile matter shall not be allowed to accumulate on the surfaces of enclosures, facilities, or equipment used in surface milling in amounts that, if suspended in air, would become an explosive mixture. An explosive mixture of dust containing volatile matter is 0.02 ounce or more per cubic foot of air.