30 CFR § 57.6310 - Misfire waiting period.

---
identifier: "/us/cfr/t30/s57.6310"
source: "ecfr"
legal_status: "authoritative_unofficial"
title: "30 CFR § 57.6310 - Misfire waiting period."
title_number: 30
title_name: "Mineral Resources"
section_number: "57.6310"
section_name: "Misfire waiting period."
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"
---


# 57.6310 Misfire waiting period.

When a misfire is suspected, persons shall not enter the blast area—

(a) For 30 minutes if safety fuse and blasting caps are used;

(b) For 15 minutes if any other type detonators are used; or

(c) For 30 minutes if electronic detonators are used, or for the manufacturer-recommended time, whichever is longer.

[61 FR 36801, July 12, 1996, as amended at 85 FR 2027, Jan. 14, 2020]