7 CCR 1101-9-6-9 - Misfires

(A) The blaster shall provide proper safeguards for excluding all unauthorized persons from the danger zone if a misfire is found.

(B) No other work shall be performed except what is necessary to remove the hazard of the misfire and only those employees necessary to perform the work shall remain in the danger zone.

(C) Explosives shall not be extracted from a hole that has misfired unless it is impossible or hazardous to detonate any unexploded explosive materials by insertion of an additional primer.

(D) If there are any misfires while using fuse detonators and safety fuse, all employees shall remain away from the charge for at least one hour. Misfires shall be handled under the direction of the person in charge of the blasting. All fuses shall be carefully traced and a search made for the unexploded charges.

(E) When electric detonators have been used, workers shall not return to the blast area for at least 30 minutes unless the manufacturer recommends additional time before returning to the blast area. All wires shall be carefully traced and a search made for unexploded charges.

(F) When a completely non-electric initiation system, other than safety fuse, has been used, all employees shall remain away from the blast area for at least 15 minutes. All shock tubes shall be traced and a search made for unexploded charges.

(G) When electronic detonators have been used, workers shall not return to the blast area for at least 30 minutes unless the manufacturer recommends additional time before returning to the blast area.

(H) If explosives are suspected of burning in a hole, all persons in the endangered area shall move to a safe location and no one shall return to the hole for at least one hour after evidence of combustion ceases.

(I) No drilling, digging or picking shall be permitted until all missed holes have been detonated or the blaster in charge has approved that work can proceed.

(J) Explosive materials recovered from misfires shall not be reused and shall be disposed of in the manner recommended by the manufacturer.

Notes

7 CCR 1101-9-6-9

38 CR 03, February 10, 2015, effective 3/10/2015 41 CR 21, November 10, 2018, effective 12/1/2018 42 CR 06, March 25, 2019, effective 5/1/2019