30 CFR § 75.1310 Explosives and blasting equipment.
(a) Only permissible explosives, approved sheathed explosive units,
and permissible blasting units shall be taken or used underground.
(b) Black blasting powder, aluminum-cased detonators,
aluminum-alloy-cased detonators, detonators with aluminum leg wires, and
safety fuses shall not be taken or used underground.
(c) Explosives shall be fired only with a permissible blasting unit
used in a manner consistent with its approval. Blasting units approved by
MSHA that have approval labels specifying use with short-delay detonators
with delay periods between 25-500 milliseconds are accepted to fire
short-delay detonators up to 1,000 milliseconds, instantaneous detonators
and long period delay detonators for anthracite mines.
(d) Permissible explosives and sheathed explosive units shall not be
used underground when they are below the minimum product firing temperature
specified by the approval. Explosives previously approved which do not
specify a minimum firing temperature are permissible for use so long as the
present approval is maintained.
(e) Electric detonators shall be compatible with the blasting unit
and have sufficient strength to initiate the explosives being used.
