I took my girlfriend for a visit 7 or 8 years ago. At that point the town had been almost completely razed. Without explanation to an uninitiated viewer, curbs and fire hydrants bizarrely poked out from a field of weeds that had grown over much of the town's streets, the houses behind them long bulldozed and abandoned. The strangest thing to me, though, was the juxtaposition of the newly-constructed Locust Ridge Wind Farm high on a neighboring mountain, its enormous windmills plainly visible from the rubble on the hill in town, all offering a stark and beautiful reminder that even after the apocalypse things can get better.
Some of the mined uranium was found to have a lower concentration of uranium-235 than expected, as if it had already been in a reactor. When geologists investigated they also found products typical of a reactor. They concluded that the deposit had been in a reactor: a natural nuclear fission reactor, around 1.8 to 1.7 billion years BP – in the Paleoproterozoic Era during Precambrian times. At that time the natural uranium had a concentration of about 3% 235U, and could have reached criticality with natural water as neutron moderator allowed by the special geometry of the deposit.
It sputtered on and off for hundreds of thousands of years:
There were still homes on the edges, which I was surprised to see. Good to read the article to understand why they were still there. I imagine they're happy that the 'attraction' has been shut down.
I personally found the wiki article interesting from beginning to end.