The owner, lessee, or operator of every coal mine shall provide and maintain airways of sufficient dimensions, and in no case shall the area of the aircourse be less than 25 square feet in mines operated in any underground system.
Mont. Code Ann. § 50-73-304
Owner to provide and maintain airways
Known as the Montana Coal Mining Code
The act spans §§ 50–50 (43 sections).
En
Official source: Montana Code Annotated (Montana Legislature). Reproduced from public-domain Montana statutes; confirm against the official source for the current text. Not legal advice.