Section 48
SEC. 48. No lode or placer mining claim shall be recorded unless the declaration of location be accompanied by an affidavit made by the applicant or some person on his behalf cognizant of the facts that the legal notices required by this Act for a lode or a placer claim have been posted upon the claim, that in the case of a lode claim mineral has been found in place therein, or in the case of a placer claim the ground thereby embraced is valuable for placer mining purposes, and that the ground applied for is unoccupied for mining purposes by any other person.