52 Pa. Stat. § 70-224
The mine foreman or his assistant shall visit and examine every working place in the mine each working shift while the men of such place are or should be at work, and shall direct and see that each and every working place is properly secured by props, timber, roof bolts or such other practical devices as may serve to secure the safety of the workmen, and that safety in all respects is assured by having all loose coal or rock pulled down or secured, and that no person shall be permitted to work in an unsafe place, unless it be for the purpose of making it secure, and a report of said examination shall be recorded in a book kept at the colliery for that purpose, and signed by the person making the same. All such reports shall be made and signed at the end of each shift and countersigned within a period of one week by the mine foreman; providing, however, if the mine is idle forty-eight hours or more, the mine foreman, assistant mine foreman or mine examiner shall examine every working place and the adjoining places the day before operations are resumed; and all such entries shall be made and signed in ink in a manner similar to that heretofore described.
52 P.S. § 70-224