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Explosive materials shall be stacked in piles not less than 25 feet from the nearest holes being loaded and so spaced and distributed as to prevent propagation of an explosion between any two piles in the event of a premature detonation in any portion of the blast area.
The explosive materials containers, if any, shall be opened at the pile and carried up to the hole one case or unit at a time for immediate loading, or placed at a loading station not less than 6 feet from the hole, except that not more than 100 pounds of explosive materials shall be allowed at the loading station at any one time.
When drilling and loading are being performed simultaneously in the same area, the two operations shall be separated as widely as practicable and in no case shall drilling be conducted closer to a loaded hole than a distance equal to the deepest blast hole in the area.
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