So why do these people know its granted exclusive ownership?
http://www.publicland.org/
Mining Law of 1872
PLF Position Statement [2010-18] posted: September 11, 2010
The Public Lands Foundation (PLF) advocates the reform of the 1872 Mining Law to eliminate some of the exclusive ownership and use rights that are granted to mining claimants, to substitute some mechanism other than patenting to provide appropriate tenure for mine development, to obtain fair return of royalties to the public and to reclaim the land to the extent possible so that other uses may be made of the land, and to provide that future proposed mining operations be subject to the same environmental and land use planning considerations as are required for other uses of .... Read PLF Position Statement 2010-18