(a) The commission, with the approval of the governor, may sell marl, sand, gravel, shell, and mudshell for not less than four cents a ton.
(b) The commission may require other terms and conditions for the sale of marl, sand, gravel, shell, and mudshell.
(c) Payment for sales shall be made to the commission.
(d) Marl, sand, gravel, shell, and mudshell may be removed without payment to the commission if removed from land or flats patented to a navigation district by the state for any use on the land or flats or on any adjoining land or flats for any purpose for which the land or flats may be used under the authority of the patent to the district, or if removed to provide access to a boat ramp under Section 31.141(c) of this code.