This chapter, referred to in text, was in the original “this Act”, meaning Pub. L. 91–173,
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