Miss. Code § 59-9-29
Any county port authority or county development commission created under the provisions of this chapter is hereby vested with full jurisdiction and control of any and all lands lying within or adjacent to any river, bay or natural lake, which are below the mean high tide mark, and which lands lie within or adjacent to any port or harbor within the jurisdiction of such county port authority or county development commission. Any such county port authority or county development commission is hereby authorized to reclaim any and all such lands by filling, dredging, or other means, to utilize, lease, sell, or dispose of same for the development and operation of the port to the same extent it is now or may hereafter be authorized to utilize its other facilities. Any such county port authority or county development commission, pursuant to resolutions adopted by the port commission and the governing body of the municipality in which the port of entry is located, may exercise joint and concurrent jurisdiction of any such lands described in such resolutions within the jurisdiction of the port commission of the port of entry, and outside of the corporate limits of such municipality, and may exercise the above powers jointly with such port commission as to such lands.
Under any such state-owned lands, if any, hereinabove turned over to the county port authority or county development commission, all oil, gas and other mineral rights are hereby reserved unto the State of Mississippi.
Miss. Code § 59-9-29