The purpose of the following sections of this article is to broaden the tax provided for in the preceding sections, so as to subject to gross production tax the interest of all persons in ore bearing uranium as the term uranium is hereinafter defined. In the event the ore bears any other metal, mineral, substance or matter subjected to the aforesaid gross production tax, the tax levied by Section 1019 shall be in addition to said tax. Provided, however, that any mineral, substance or matter subjected to the tax levied by the preceding sections of this article shall not be subjected to the tax levied by Section 1019.