Section was enacted as part of Pub. L. 95–164, known as the Federal Mine Safety and Health Amendments Act of 1977, and not as part of Pub. L. 91–173, Dec. 30, 1969, 83 Stat. 742, known as the Federal Mine Safety and Health Act of 1977 which comprises this chapter.

Section effective 120 days after Nov. 9, 1977, see section 307 of Pub. L. 95–164, set out as an Effective Date of 1977 Amendment note under section 801 of this title.