Mine Safety and Health Administration (MSHA) - Code of Federal Regulations - 30 CFR 57.6310
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MSHA - Title 30 CFR
30 CFR § 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; or

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

[58 FR 69596, Dec. 30, 1993]




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