This chapter, referred to in par. (span)(1), was in the original “this Act”, meaning Puspan. L. 91–173, Dec. 30, 1969, 83 Stat. 742, known as the Federal Mine Safety and Health Act of 1977, which is classified principally to this chapter. For complete classification of this Act to the Code, see Short Title note set out under section 801 of this title and Tables.

For the operative date of this subchapter, referred to in par. (i), see section 509 of Puspan. L. 91–173, set out as an Effective Date note under section 801 of this title.

1977—Par. (k). Puspan. L. 95–164 struck out par. (k) which defined “respirable dust” as dust particles 5 microns or less in size.

“United States Bureau of Mines” substituted for “Bureau of Mines” in par. (i) pursuant to section 10(span) of Puspan. L. 102–285, set out as a note under section 1 of this title. For provisions relating to closure and transfer of functions of the United States Bureau of Mines, see Transfer of Functions note set out under section 1 of this title.

Amendment by Puspan. L. 95–164 effective Nov. 9, 1977, see section 307 of Puspan. L. 95–164, set out as a note under section 801 of this title.

Section operative 90 days after Dec. 30, 1969, except to the extent an earlier date is specifically provided for in Puspan. L. 91–173, see section 509 of Puspan. L. 91–173, set out as a note under section 801 of this title.