Section 663 - Designation and marking of coal pillars Every owner, operator, lessor, lessee, or general contractor, engaged in the mining of anthracite coal, or any president, director, general manager, superintendent, or other person in charge of, or having supervision over, any anthracite coal mine or mining operation in this Commonwealth, shall be, and is hereby, required:
(a) To designate, within a period of six months from the passage of this act, and to keep designated by number, each and every pillar of anthracite coal beneath the surface still remaining in place at the time this act goes into effect and all pillars thereafter created, the number of each pillar to be placed in a conspicuous position with white paint or some other equally durable and visible substance; and (b) to designate, or cause to be designated, by numerals of convenient and legible size, upon all mine maps or plans mentioned in section two of this act, with the space on each map or plan designating any pillar of coal, the number of such pillar.1921, May 27, P.L. 1198, § 3.