Where minerals have been found and the evidence is of such a character that a person of ordinary prudence would be justified in the further expenditure of his labor and means, with a reasonable prospect of success, in developing a valuable mine, the requirements...
Oil-shale Lands: Hearings Before the Committee on Public Lands and Surveys ... - 92. lappuse
autors: United States. Congress. Senate. Committee on Public Lands and Surveys - 1931 - 351 lapas