Pick a mine or remote ghost town on a map, drive to it, see a "no trespassing" sign, drive to the next one!
A lot of the mining and historical sites are private property, owned either by private parties or by large corporations wanting to hold onto potential future mining assets. It takes time to explore them and to develop contacts and permissions. Nevada is a "stand your ground" state... don't get yourself shot!
For a long time I've been exploring Nevada, looking for enough sites to make a dedicated trips worthwhile for small groups of photographers. The exploration itself has been quite an adventure: lots of maps, lots of miles. Did a fair amount of four-wheeling in early July, fixed some flat tires, got stuck overnight in some deep spring mud before getting towed out by a hunter at dawn... fun times!