New Jersey Administrative Code
Title 12 - LABOR AND WORKFORCE DEVELOPMENT
Chapter 190 - EXPLOSIVES
Subchapter 7 - USE OF EXPLOSIVES
Section 12:190-7.20 - Misfires
Current through Register Vol. 56, No. 18, September 16, 2024
(a) When a misfire is discovered, the blaster shall provide proper safeguards and notify his employer.
(b) No work shall be done except that necessary to remove the hazard of the misfire and only those employees necessary to do the work shall remain in the blast area.
(c) When broken wires, faulty connections or short circuits are determined to be the cause of a misfire, proper repairs shall be made and the charge refired, provided the burden has not been dangerously weakened.
(d) When the blast hole cannot be refired, the stemming may be removed from the misfired blast hole by the use of compressed air, water, or other suitable means. A new priming charge may be added, the hole restemmed, and fired providing there is no danger of fly-rock or other hazards. The use of the drill to remove stemming shall be prohibited.
(e) When unfired explosives are found in a muck pile all loading work shall be stopped. The pieces of explosives and broken rock shall be carefully removed by hand until the unfired hole is exposed. If there is no danger of fly-rock from the weakened burdens, the blaster may reprime the hole and fire. If there is a danger of fly-rock, the unfired explosives in the hole shall be washed out with water.
(f) If conditions preclude the procedure described in (e) above, the blaster in charge shall safeguard the area and notify the appropriate officials of the Division of Public Safety and Occupational Safety and Health. All work in the blast area shall cease pending a joint investigation by the blaster and the appropriate officials of the Division of Public Safety and Occupational Safety and Health.
