MSHA - Code of Federal Regulations - 30 CFR 56.6130
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MSHA - Title 30 CFR
30 CFR § 56.6130
Explosive material storage facilities.

(a) Detonators and explosives shall be stored in magazines.
(b) Packaged blasting agents shall be stored in a magazine or other facility which is ventilated to prevent dampness and excessive heating, weather-resistant, and locked or attended. Drop trailers do not have to be ventilated if they are currently licensed by the Federal, State, or local authorities for over-the-road use. Facilities other than magazines used to store blasting agents shall contain only blasting agents.
(c) Bulk blasting agents shall be stored in weather-resistant bins or tanks which are locked, attended, or otherwise inaccessible to unauthorized entry.
(d) Facilities, bins or tanks shall be 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.
[58 FR 31908, June 7, 1993; 58 FR 69596, Dec. 30, 1993]
NOTE: At 58 FR 69596, December 30, 1993, the effective date of the first sentence in §56.6130(b) is stayed until January 31, 1993.