(a) Where misfires occur with electric detonators, a waiting period of at least five
minutes shall elapse before anyone returns to the shot. After such failure, the blasting cable shall be disconnected from the source of
power and the battery ends short-circuited before electric connections are examined.
(b) Explosives shall be removed by firing 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 borehole with water, or by inserting and firing a new primer after the stemming
has been washed out.
(c) A 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
(d) The handling of a misfired shot shall be under the direct supervision of the mine
foreman or a certified person designated by him.
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