For the operative date of this chapter, referred to in subsec. (b), see section 509 of
Pub. L. 91–173, set out as an Effective Date note under section
801 of this title.
1977—Subsec. (b).
Pub. L. 95–164 inserted reference to mines other than coal mines.
Amendment by
Pub. L. 95–164 effective 120 days after Nov. 9, 1977, except as otherwise provided, see section 307 of
Pub. L. 95–164, set out as a note under section
801 of this title.