Section 57.6604 - Precautions during stormsDuring the approach and progress of an electrical storm-
(a) Surface blasting operations shall be suspended and persons withdrawn from the blast area or to a safe location; or(b) Underground electronic or electrical blasting operations that are capable of being initiated by lightning shall be suspended and all persons withdrawn from the blast area or to a safe location.61 FR 36801, July 12, 1996, as amended at 85 FR 2027 , Jan. 14, 2020