30 CFR § 56.6306
Loading, blasting, and security.
(a) When explosive materials or initiating systems are brought to
the blast site, the blast site shall be attended; barricaded and posted
with warning signs, such as ``Danger,'' ``Explosives,'' or ``Keep
Out;'' or flagged against unauthorized entry.
(b) Vehicles and equipment shall not be driven over explosive
material or initiating systems in a manner which could contact the
material or systems, or create other hazards.
(c) Once loading begins, the only activities permitted within the
blast site shall be those activities directly related to the blasting
operation and the activities of surveying, stemming, sampling of
geology, and reopening of holes, provided that reasonable care is
exercised. Haulage activity is permitted near the base of a highwall
being loaded or awaiting firing, provided no other haulage access
(d) Loading and blasting shall be conducted in a manner designed to
facilitate a continuous process, with the blast fired as soon as
possible following the completion of loading. If blasting a loaded
round may be delayed for more than 72 hours, the operator shall notify
the appropriate MSHA district office.
(e) In electric blasting prior to connecting to the power source,
and in nonelectric blasting prior to attaching an initiating device,
all persons shall leave the blast area except persons in a blasting
shelter or other location that protects them from concussion (shock
wave), flying material, and gases.
(f) Before firing a blast--
(1) Ample warning shall be given to allow all persons to be
(2) Clear exit routes shall be provided for persons firing the
(3) All access routes to the blast area shall be guarded or
barricaded to prevent the passage of persons or vehicles.
(g) Work shall not resume in the blast area until a post-blast
examination addressing potential blast-related hazards has been
conducted by a person with the ability and experience to perform the