>>1634626i'd recommend looking into Richard Proenneke. lived in his Alaskan log cabin for almost 30 years, theres some books about him.
the big problem with learning about modern mountain men is that (for obvious reasons) they rarely highlight their own existence. lots of the time the only way anyone finds out about them is when they either get arrested or die (like Mcandless). there are plenty of pretty modern mountain men that have broken the law. i shouldnt even have to tell you about Kaczynski . theres Christopher Thomas Knight, who lived in the Maine wilderness for 27 years and survived by looting cabins, but thats not really living off the land. Claude Dallas and Troy Knapp both became wild men after running from the police,both surviving by hunting and trapping on private property. there were quite a lot of mountain men at the turn of the 20th century, if you can consider that somewhat modern. Mansel Carter was a gold prospector that lived in the middle of nowhere, Arizona for most of his life. Montague Stevens was a one-armed englishman who made a living hunting bears in the american west. my knowledge on the mountain men of the american west is admittedly pretty sparse, but firsthand information about these kinds of people are pretty hard to come by.