33 U.S.C. § 680

Examination of mines; reports

Said commission, or a committee therefrom, or officer of said corps assigned to duty under its orders, shall, whenever deemed necessary, visit said territory and all mines operating under the provisions of this chapter. A report of such examination shall be placed on file.

( Mar. 1, 1893, ch. 183, § 20 , 27 Stat. 510 .)