Never happened. The land was federal land under the Treaty that ended the Mexican War, which was before Nevada ever became a state. When Nevada was admitted to the Union, it disclaimed any interest in federal lands within its borders.
Well what should those lands then be called? They aren’t Nevada, then. Somebody tell the map makers please!
One could spend their whole life studying how all this came to be, it is not as simple as what you state. Federal land except for specific purposes was supposed to be turned back to the states, all of the states as far as I know. There were many steps with different outcomes, but way back the theory was that the federal government only had claim on land for specific purposes.
I do not pretend to be an expert but I think to really understand all of this requires digging and I found this interesting video that leads one to many places (documents, congressional and state actions, etc.) seems to be a treasure map to learning more about all this...
http://okanoganrlc.wordpress.com/2014/01/15/ken-ivory-explains-the-history-of-flpma-pilt-and-srs/