§ 33.83. Pillars along property lines.

 (a)  The owners, operators or superintendents of adjoining mine properties shall leave a pillar of material in each bed, seam or vein worked by them, along the line of adjoining property. This pillar shall be wide enough to provide a sufficient barrier, when taken in connection with the pillar to be left by the adjoining property, to insure the safety of the employes of either mine should the other one be abandoned and allowed to fill with water.

 (b)  The width of the pillar to be left shall be determined by the engineers of the adjoining property and the mine in question, together with a representative of the Department. In the event of failure to agree, a decision by the representative of the Department shall be final and binding on both parties. This pillar shall not be pierced or mined into at any point without permission.

 (c)  Two surveys of the face of the workings along the pillar shall be made, which shall be in close agreement. Certified copies of the duplicate surveys shall be filed with the owners, operators, or superintendents of the adjoining mines, and with the Department. If no mining operations are contemplated or are in progress on the adjoining property, the owner, operator or superintendent is not required to file a copy of the survey with the persons in legal possession of the adjoining property, and mining operations may be carried right up to the boundary of the adjoining property.