If any person or persons shall wilfully remove, disturb, deface or in any way injuriously interfere with any monument, the joint commission of the states of Pennsylvania and Ohio, or the joint commission of Pennsylvania and West Virginia may deem necessary to the proper marking of the boundary line, and shall have placed thereon or adjacent thereto as index monuments, said person or persons shall pay a fine of not less than five hundred dollars, and be imprisoned not less than one, or more than six months, or both, at the discretion of the court.