43 U.S. Code § 909 - Forfeiture of grant on failure to make deposit
If any railroad corporation required by law to pay the costs of surveying, selecting, or conveying any lands granted to such corporation, or for its use and benefit, by any Act of Congress, shall, for ninety days from notice or demand by the Secretary of the Interior, as provided by section 908 of this title, neglect or refuse to deposit an amount sufficient to meet the expense of surveying, selecting, and conveying the unsurveyed lands granted to such company, or for its use and benefit, by any Act of Congress, and designated in the notice or demand by the Secretary of the Interior, as aforesaid, the rights, title, and interests of such company, and all those claiming by, through, or under it, in and to the unsurveyed lands designated in the notice of the Secretary, as aforesaid, shall cease and forfeit to the United States; and the Secretary of the Interior shall notify the Attorney General, who shall at once commence proceedings to declare the forfeiture and to restore the lands forfeited to the public domain.
Source(June 25, 1910, ch. 406, § 2,36 Stat. 834.)