(a) Approved explosives and sheathed explosive units shall be subject
to periodic audits by MSHA for the purpose of determining conformity with the
technical requirements upon which the approval was based. Any approved
explosive or sheathed explosive unit which is to be audited shall be selected
by MSHA and be representative of those distributed for use in mines. The
approval-holder may obtain any final report resulting from such audit.
(b) No more than once a year, except for cause, the approval-holder,
at MSHA's request, shall make one case of explosives or 25 sheathed explosive
units available at no cost to MSHA for an audit. The approval-holder may
observe any tests conducted during this audit.
(c) An approved explosive or sheathed explosive unit shall be subject
to audit for cause at any time MSHA believes that it is not in compliance
with the technical requirements upon which the approval was based.
(d) Explosives approved under regulations in effect prior to January
17, 1989, shall conform to the provisions on field samples set out in those
regulations (See 30 CFR Part 15, 1987 Edition).