At any mine where one of the two openings as required herein, is a slope and is used as a traveling way, it shall not have a greater angle of descent than twenty degrees (20o) and may be of any depth.
Okla. Stat. tit. 45, § 510
Angle of traveled slope
R.L.1910, § 3965.
Official source: Oklahoma Legislature. Reproduced from public-domain Oklahoma statutes; confirm against the official source for the current text. Not legal advice.