It's not easy to get here but it's definitely worth it. I organised a tour from Rancagua which went to the town once a week. There are also apparently tours you can do from Santiago.

It's an incredible place to be in, with everything abandoned. There’s an old theatre that is empty but for the memories of the nights that the workers would spend here to find relief from the loneliness of their lives. Dormitory buildings have corridors of doors that are never opened or closed and hide an emptiness behind them. The wide and steep staircases between the buildings lead to nowhere.