Okla. Stat. tit. 68 § 1021
The gross production tax levied by the preceding section shall be reported to and collected by the Tax Commission at the same time and in the same manner as is now provided by law for the collection of gross production tax on ore. Upon being collected the taxes shall be apportioned precisely like taxes collected under Sections 1001-1016 of this Code. On ores sold at the time of production, the tax thereon shall be paid by the producer, who is hereby authorized to deduct in making settlement with the producer and/or royalty owner the amount of tax so paid; provided, that in the event ore on which such tax becomes due is not sold at the time of production, but is retained by the producer, the tax on such ore not so sold shall be paid by the producer for himself, including the tax due on royalty ore not sold; provided, further, that in settlement with the royalty owner, such producer shall have the right to deduct the amount of tax so paid on royalty ore, or to deduct therefrom royalty ore equivalent in value at the time such tax becomes due with the amount of tax paid.
Okla. Stat. tit. 68, § 1021