MSHA - Code of Federal Regulations - 30 CFR 57.6133
Skip to content
MSHA - Title 30 CFR
30 CFR § 57.6133
Powder chests.
(a) Powder chests (day boxes) shall be--
(1) Structurally sound, weather-resistant, equipped with a lid or cover, and with only nonsparking material on the inside;
(2) Posted with the appropriate United States Department of Transportation placards or other appropriate warning signs that indicate the contents and are visible from each approach;
(3) Located out of the blast area once loading has been completed;
(4) Locked or attended when containing explosive material; and
(5) Emptied at the end of each shift with the contents returned to a magazine or other storage facility, or attended.
(b) Detonators shall be kept in chests separate from explosives or blasting agents, unless separated by 4-inches of hardwood or equivalent, or a laminated partition. When a laminated partition is used, operators must follow the provisions of the Institute of Makers of Explosives (IME) Safety Library Publication No. 22, ``Recommendations for the Safe Transportation of Detonators in a Vehicle with other Explosive Materials,'' (May 1993), and the ``Generic Loading Guide for the IME-22 Container,'' (October 1993). This incorporation by reference has been approved by the Director of the Federal Register in accordance with 5 U.S.C. 552(a) and 1 CFR part 51. Copies are available at MSHA, 1100 Wilson Boulevard Room 2436, Arlington, Virginia 22209-3939, and at all Metal and Nonmetal Mine Safety and Health district offices, or available for inspection at the Office of the Federal Register, 800 North Capitol Street, NW., 7th Floor, suite 700, Washington, DC.