The mineral documentary tax shall be a lien upon the interest leased, assigned, conveyed, reserved, excepted or transferred and the amount to be paid shall be determined as follows (provided that the minimum tax shall be one dollar), to-wit:
Upon the filing and recording of each instrument creating, assigning or transferring a leasehold (or interest therein or any portion thereof) or conveying, transferring, excepting or reserving a mineral or royalty interest as above described, the primary term of which shall expire ten (10) years or less from the date of the execution of the instrument, the tax shall be a sum equal to Three Cents (3¢) per mineral or royalty acre conveyed, leased, assigned, excepted, reserved or transferred therein.
Such tax shall be Six Cents (6¢) per mineral or royalty acre if the primary term of such interest shall expire more than ten (10) years and not exceeding twenty (20) years from the date of the execution of such instrument.
Such tax shall be Eight Cents (8¢) per mineral or royalty acre if the primary term of such interest shall extend more than twenty (20) years from the date of the execution of such instrument.