29.F Drilling and Loading.
29.F.01 All drill holes must be sufficiently large enough to freely allow for the insertion of the explosives.
Don't try this at home.
29.F.02 Drilling must not be done in an area already blasted until remaining "bootlegs" are examined for unexploded charges and the total area has been examined to make sure that there are no unexploded charges remaining.
- Never insert a drill, pick, or bar into bootlegs even if examination fails to disclose explosives.
- When misfires have occurred and drilling must be done in an area where undetonated holes may exist, holes must not be drilled where there is danger of intersecting a misfired hole.
- All drilling necessary to neutralize misfires must be done under the supervision of a competent person who has a working knowledge of the explosive materials involved and is familiar with the conditions under which the misfired holes were drilled, loaded, primed, and initiated, and is familiar with the drilling equipment capabilities that will be used during the neutralization.
29.F.03 Drilling and loading operations must not be carried on in the same area. Drilling must be separated from loaded holes by at least the depth of the loaded hole but in no case less than 50 ft (15.2 m).
29.F.04 Persons must not be allowed to deepen drill holes that have contained explosives or blasting agents.
29.F.05 Holes must not be drilled so that they disturb or intersect a loaded hole.
29.F.06 See Section 18.H for earth drilling requirements.
29.F.07 The loading or loaded area must be kept free of any equipment, operations, or persons not essential to loading; no vehicle traffic must be permitted over loaded holes; the blast site must be guarded or barricaded and posted with danger signs to restrict unauthorized entry.
29.F.08 Holes must not be loaded except those to be fired in the next round of blasting; after loading, all remaining explosive materials and detonators must be immediately returned to an authorized magazine; explosive materials or loaded holes must not be left unattended at the blast site at any time.
29.F.09 Loading of sprung or jet-pierced holes must be prohibited until it is established that the hole has cooled sufficiently to allow loading.
29.F.10 Explosives must not be loaded or used underground in the presence of combustible gases or combustible dusts unless the conditions of use have been thoroughly identified and accepted, in writing, as safe by a competent person qualified by a thorough knowledge of the factors to be evaluated or by the written permission of the authority having jurisdiction where an authority exercises jurisdiction.
29.F.11 Cartridges must be primed only in the number required for a single round of blasting.
29.F.12 Detonators must not be inserted in explosive materials which do not have a cap well without first making a hole in the cartridge with a non-sparking punch of proper size, or the appropriate pointed handle of a cap crimper.
29.F.13 Cartridges must be seated by even steady pressure only.
29.F.14 Tamping must be done with wood rods without exposed metal parts. Non- sparking metal connectors may be used for joint poles. An approved plastic tamping pole may also be used.
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29-8. When is it permissible to load blasting holes?
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