Neb. Rev. Stat. § 57-104: Neb. Rev. Stat. § 57-104

It shall be the duty of the persons prospecting for coal, any mineral, ore, crude oil, or gas, carefully to preserve specimens from each stratum through which the shafts are sunk, or borings are made; and to deposit the same, properly labeled, in care of the proper department of the state for the future use of the commonwealth.