30 U.S. Code § 823a - Principal office in District of Columbia; proceedings held elsewhere
The principal office of the Commission shall be in the District of Columbia. Whenever the Commission deems that convenience of the public or the parties may be promoted, or delay or expense may be minimized, it may hold hearings or conduct other proceedings at any other place.
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.