73 Pa. Stat. § 155
The department shall determine the amount of explosives that may be stored or placed in magazines and shall issue a license to the person applying therefor, as hereinafter provided, such license to stipulate the maximum amount of explosives permitted.
Whenever any person fails, for thirty days, to pay the annual license fee hereinafter provided, after the same becomes due or otherwise violates any of the provisions of this act, the Secretary of Labor and Industry may cancel such license. Whenever a license is cancelled for any cause, the Secretary of Labor and Industry, or his duly authorized representative shall notify, in writing, the person to whom such license is issued of the fact of such cancellation, and shall in said notice direct the removal of all explosives stored in said magazine within a reasonable time limit, but not to exceed ten days from the giving of said notice. Failure to so remove the explosives stored in said magazine within the time specified in said notice shall constitute a violation of this act.
73 P.S. § 155