Code of Federal Regulations Title 43. Public Lands:  Interior § 43.3871.2 Statement of claim

(a) The adverse claim must fully set forth the nature and extent of the interference or conflict;  whether the adverse party claims as a purchaser for valuable consideration or as a locator. If the former, a certified copy of the original location, the original conveyance, a duly certified copy thereof, or an abstract of title from the office of the proper recorder should be furnished, or if the transaction was a merely verbal one he will narrate the circumstances attending the purchase, the date thereof, and the amount paid, which facts should be supported by the statement of one or more witnesses, if any were present at the time, and if he claims as a locator he must file a duly certified copy of the location from the office of the proper recorder.

(b) In order that the “boundaries” and “extent” of the claim may be shown, it will be incumbent upon the adverse claimant to file a plat showing his entire claim, its relative situation or position with the one against which he claims, and the extent of the conflict:  Provided, however, That if the application for patent describes the claim by legal subdivisions, the adverse claimant, if also claiming by legal subdivisions, may describe his adverse claim in the same manner without further survey or plat. If the claim is not described by legal subdivisions it will generally be more satisfactory if the plat thereof is made from an actual survey by a mineral surveyor and its correctness officially certified thereon by him.