delivered the opinion of the Court.
Thе Virginia-Colorado Development Corporation brought this suit to obtain a mandatory injunction against the Secretary of the Interior requiring him to vacatе certain adverse proceedings and his decision declaring certain placer claims of the plaintiff to be void. Motion to dismiss the bill of complaint was denied and, on defendant’s refusal to plead further, plaintiff obtained a decree which the Court of Appeals affirmed. 63 App. D. C. 47; 69 F. (2d) 123. This Court granted a writ of certiorari,
*643 The bill alleged that in June, 1917, under § 2324 of the Revised Statutes (30 U. S. C. 28), рlaintiff located certain off shale placer claims on mineral lands of the United States in Colorado ,and thereupon became the owner of the claims and entitled to their exclusive possession; that from that time until, and including, the year ending July 1, 1930, the annual assessment work required by the statute was performed on each of the claims; that during the year ending July 1, 1931, the assessment work was not performed and had not been resumed before September 4, 1931, or sincе, but that plaintiff then intended to resume work, and had made arrangements for that resumption which would have been had but for the action of defendant; that plaintiff had not abandoned, or intended to abandon, any of the claims and that no charge to that effect had been made; that about September 4, 1931, adverse proceedings were initiated by the Department of the Interior, through the General Land Office, with the filing of a “ challenge ” to plaintiff’s title and right of possession and by “ posting such challenge on the said claims ”; that the challenge was based on the sole ground that plaintiff had not performed the annual assessment work and that “ the United States resumed possession of said land.”
Plaintiff further alleged that there had been “ no relocation of any of the claims by any person since plaintiff’s failure to perform the annual assessment work, and that there had been no application by anyone to lease any of the claims from the United States.” Plaintiff recited the answer he had made to the challenge, in substance, that notwithstanding his failure to perform the described work, he had the right to retain possеssion of the claims and to resume work thereon “ at any time prior to a valid subsequent location of said claims”; but that the Commissioner of the General Land Office had held that the claims were null and void, and his ruling had been af *644 firmed by the Secretary of the Interior whose decision had been promulgated declаring that the United States had taken possession for its own purposes, thus in effect decreeing a forfeiture.
Plaintiff then set forth the provisions of the Mineral Leasing Act of February 25, 1920, which authorized the Secretary of the Interior to execute leases of mineral lands, but contained an exception as to valid claims existing on the date of the passage of the Act “ and thereafter maintained in compliance with the laws under which initiated, which claims may be perfected under such laws, including discovery.” 1
1. The character and extent of the right which plaintiff acquired by virtue of its location of the mining claims, in 1917, are wеll established. Restating the rule declared by many decisions, we said in
Wilbur
v.
Krushnic, 280
U. S. 306, 316, that such a location, perfected under the law, “has the effect of a grant by the United States of the right of present and exclusive possession. The claim is property in the fullest sense of that term.” It is alienable, inheritable, and taxable. Sеe
Forbes
v.
Gracey,
There was authority in the Secretary of the Interior, by appropriate proceedings, to determine that a claim was invalid for lack of discovery, fraud, or other defect, or that it was subject to cancellation by reason of abandonment.
Cameron
v.
United States,
2. The Leasing Act of 1920 inaugurated a new policy. Instead of the аcquisition of rights by location, the Act provided for leases. But by express provision, the Act saved existing valid claims “ thereafter maintained in compliance with the laws under which initiated, which claims may be perfected under such laws.” § 37. 2 What then was the status of plaintiff’s claims under this exception? They were originally vаlid claims. No question is raised to the contrary. There is no suggestion of *646 lack of discovery, fraud or other defect. There is no ground for a charge of abandonment. The allegations of the bill, admitted by the motion to dismiss, dispose of any such contention. Plaintiff had lost no rights by failure to do the annual assessment work; that failure gave the government no ground of forfeiture. Wilbur v. Krushnic, supra.
How could the valid claims of plaintiff be “ thereafter maintained in compliance with the laws under whiсh initiated”? Manifestly, by a resumption of work. Plaintiff was entitled to resume, and the bill alleged that plaintiff had made arrangements for resumption, and that work would have been resumed if the Department of the Interior had not intervened. Plaintiff’s rights after resumption would have been as if “ no default had occurred.” Belk v. Meagher, supra. Such a resumption would have been an act “ not in derogation but in affirmance of the original location,” and thereby the claim would have been “ maintained.” As we said in Wilbur v. Krushnic, supra, p. 318, “Such resumption does not restore a lost estate . . .; it preserves an existing estate.”
In this view, plaintiff came directly within the exception. The Government invokes the new policy of the Leasing Act abolishing the practice of locаtion. But the saving provision of § 37 is a part of the policy of the Act. Its terms explicitly declare the will of Congress as to valid existing claims, with full understanding of the status оf such claims under the prior law.
The Government refers to the reservation in the opinion in Wilbur v. Krushnic, supra, as to the maintenance of a claim by a resumption of work “ unless ,at least some form of challenge on behalf оf the United States to the valid existence of the claim has intervened.” But that was a reservation, not a decision, and it does not aid the Government in its cоntention here. To be effective, the *647 “ challenge ” to the “ valid existence ” of ,a claim must have some proper basis. No such basis is shown.
We think that the Department’s chаllenge, its adverse proceedings, and the decision set forth in the bill went beyond the authority conferred by law. The decree is
Affirmed.
Notes
Section 37 of the Act of Fеbruary 25, 1920, c. 85, 41 Stat. 437, 451 (30 U. S. C. 193) is as follows:
“Sec. 37. That the deposits of coal, phosphate, sodium, oil, oil shale, and gas, herein referred to, in lands valuable for such minerals, including lands and deposits described in the joint resolution entitled ‘ Joint resolution authorizing the Secretary of the Interior to permit the continuation of coal mining operations on certain lands in Wyoming/ approved August 1, 1912 (Thirty-seventh Statutes at Large, p. 1346), shall be subject to disposition only in the form and manner provided in this Act, except as to valid claims existent at date of the passage of this Act and thereafter maintained in compliance with the laws under which initiated, which claims may be perfected under such •laws, including discovery.”
See Note 1.