Neb. Rev. Stat. §§ 72-223
The condemnation proceedings provided in sections 72-213 to 72-222 shall not operate to deprive the State of Nebraska of any mineral rights in the lands taken for the special purposes authorized by said sections, and, except as to land acquired by the United States of America, when any such land shall cease to be used for the special purpose for which it was acquired, it shall revert to the State of Nebraska as educational land. On lands acquired in this manner by the Game and Parks Commission all mineral income shall accrue to the appropriate state school funds; Provided, that all mineral extraction and exploration shall be conducted in a manner to be approved by both the Board of Educational Lands and Funds and the Game and Parks Commission.
Neb. Rev. Stat. §§ 72-223