(a) Where misfires occur with electric detonators, the person firing the shots shall disconnect his firing cable from the source of power and short circuit it by reshunting the ends of the cable. No person shall return to the shot until five minutes has elapsed from the misfire, and the firing cable must not be left behind anyone returning to the face.
(b) If a defect in the firing cable or connections is found, another attempt may be made to fire the shot or shots, exercising such cautions as covered in Section 25-9-134, subsection (f), subdivision (5).
(c) If the misfire is definite, explosives shall be removed by drilling and firing the bore hole for a separate charge at least two feet away from and parallel to the misfired charge, or by washing the stemming and the charge from the bore hole with water or by inserting and firing a new primer after the stemming has been washed out.
(d) A very careful search of the working place, and if necessary, of the coal after it reaches the tipple, shall be made after blasting a misfired hole, to recover any undetonated explosive.
(e) The handling of a misfired shot shall be under the direct supervision of the mine foreman, his assistant, or any competent person designated by the mine foreman or his assistant.
(f) If fuses and caps are used for blasting on the surface, misfires may not be approached by anyone until six hours have elapsed, and handling of the misfire must be done with due care and under direction of a supervisor or other competent person.
Last modified: May 3, 2021