30 C.F.R. § 56.6304 Primer protection.
Title 30 - Mineral Resources
(a) Tamping shall not be done directly on a primer. (b) Rigid cartridges of explosives or blasting agents that are 4 inches (100 millimeters) in diameter or larger shall not be dropped on the primer except where the blasthole contains sufficient depth of water to protect the primer from impact. Slit packages of prill, water gel, or emulsions are not considered rigid cartridges and may be drop loaded.
Title 30: Mineral Resources
PART 56—SAFETY AND HEALTH STANDARDS—SURFACE METAL AND NONMETAL MINES
Subpart E—Explosives
Use
§ 56.6304 Primer protection.
