have properly staked, posted notice on and located some claims, the burden rests on plaintiffs to establish which claims were properly located, which burden they had not met; and that plaintiffs failed to comply with the federal law in location of their 2,910 claims and the claims are invalid (11 IBLA at 88).
In attacking the findings against them on the location procedures of Zweifel, plaintiffs make no persuasive argument on the record. In proceedings where the validity of mining claims on Government land is at issue the Government bears the burden of establishing prima facie the invalidity of the claims and then the burden shifts to the claimant to prove that his claims are valid. See United States v. Zweifel, supra, 508 F.2d at 1157. Here there was Government proof that the area resource managers never saw any of the notices Zweifel posted, although they could have been there (Tr. 328-29; 346-48; 351-54; 454-57; 465-68). This, coupled with admissions from Zweifel (Tr. 215-22), made a prima facie case of invalidity.
Arguing that validity of the claims was established, plaintiffs point to proof that Zweifel used several men in locating the claims and that by use of Y stakes each claim would be staked, and flags and location notices were posted on each claim (Tr. 864, et.seq.). And they argue that in any event where a claim is challenged by the Government, compliance with State law is not required (Reply Brief for Appellants, 25-31).
We cannot agree. State requirements have been held by us to apply in such controversies between the Government and mining claimants. See United States v. Zweifel, supra, 508 F.2d at 1153-54. Those requirements included the marking of surface boundaries at each angle of the claim. While at one point Zweifel asserted he did this (Tr. 188), he later testified that he had not posted the four corners of each claim (Tr. 215-22). We are satisfied that the record as a whole amply sustains the findings that the claims were not properly located.
In sum, we agree with the district court’s view that the administrative findings of invalidity of the claims for lack of proper location are supported by substantial evidence.
Third, plaintiffs challenge the findings that they did not discover a valuable mineral in compliance with the mining laws. They argue that their claims in Piceance Creek Basin consist of valuable minerals— dawsonite, nachcolite, dolomite, ferroan; that the claims contain other alumina bearing compounds such as gibbsite, analcite and nordstrandite; that marketability is not required to be shown as to intrinsically valuable minerals such as gold, silver, alumina, uranium, etc.; and that it is sufficient as to them to show a general market, which was done for alumina (Reply Brief for Appellants, 12-16, 23).
The statute making mineral deposits in Government lands open to exploration and purchase refers only to “all valuable mineral deposits.” 30 U.S.C.A. § 22. In interpreting the mining laws the Secretary has used a “prudent-man test” formulated in Castle v. Womble, 19 L.D. 455, 457 (1894):
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 of the statute are met.
The Supreme Court has approved the test for some time. See United States v. Coleman, 390 U.S. 599, 602, 88 S.Ct. 1327, 20 L.Ed.2d 170, and cases there cited.
In the Coleman case the Court sustained a determination by the Secretary that quartzite deposits did not qualify under the statute because the stone could not be marketed at a profit. This refinement, the marketability test, was commended. And the Court said that “ . . . profitability is an important consideration in applying the prudent-man test . . . ” Ibid.
Plaintiffs argue that they have shown the presence of alumina, an intrinsically valúa