 They pray therefore that they may be decreed its possession and ownership in accordance with their rights.In the trial, the plaintiff produced evidence showing that on June 17, 1880, one Thomas Carroll, a citizen of the United States, while searching, on behalf of himself and the plaintiff, also a citizen, for valuable deposits of mineral, discovered, on vacant unoccupied land of the public domain of the United States in the Pioneer mining district mentioned, the outcrop of a vein or lode of quartz and other rock bearing gold and silver in valuable and paying quantities; that by an agreement between him and the plaintiff, pursuant to which the explorations were prosecuted, all lodes and veins discovered by him were to be located, one-fifth in his name and four-fifths in the name of the plaintiff; that on the day of his discovery, Carroll designated the vein or lode as the "Hawk Lode," and posted at the point of discovery a plain sign, or notice in writing, as follows