There is a legitimate argument that the federal government has no business owning 80% of Nevada.
The case law would seem to indicate that Congress was granted the power to act as it sees fit regarding these lands, and divestiture would be possible only by legislation.
Fascinating body of court decisions stretching back to
our treaties with Spain, France and Mexico govern land sovereignty, and I’ve wasted several hours looking at
court decisions.
I did find a nice article on the Property Clause of the Constitution on the Heritage website.
http://www.heritage.org/constitution/#!/articles/4/essays/126/property-clause
Another essay:
http://www.law.umaryland.edu/marshall/crsreports/crsdocuments/RL34267_12032007.pdf