(a) Each operator of a mine shall maintain a copy of each
investigation report required to be prepared under §50.11 at the mine office closest to the mine for five years after the
concurrence.
(b) Each operator shall maintain a copy of each report submitted
under §50.20 or §50.30 at the mine
office closest to the mine for five years after submission. Upon request by
the Mine Safety and Health Administration, an operator shall make a copy of
any report submitted under §50.20 or §50.30 available to MSHA for inspection or copying.
[42 FR 65535, Dec. 30, 1977, as amended at 43 FR 12318, Mar. 24, 1978]
