Short drive out to the Kofa NWR to check out this old 1910s gold mine in the heart of the Castle Dome Mountains. You have to hike about a mile from where the road is gated closed. The cabin is in great shape and is open to visitors. A logbook is absolutely full of names, though we didn't see anybody all day, it appears to be visited a couple of times a week (at a minimum) during the cool weather seasons.
There are a series of mine tunnels that seem to follow the same fault line sliced up the mountain, climbing several hundred feet. Lots of ruins, relics, and artifacts. A really neat site out in the middle of nowhere, and in reasonably good condition for being over 100 years old.