Last summer I was helping teach a geology field camp near Dillon. On our way back to the Birch Creek Outdoor Education Center each day, after long hours in the August sun spent identifying and mapping incredible exposures of rock, we would drive past a few crumbling cabins beneath an unweathered cliff face footed by large piles of scree. This was once the town of Farlin – a long-abandoned copper mining camp at the base of the Pioneer Mountains. Shortly after the dawn of the 20th century, it was home to hundreds of men, women, and children. Inextricable from the experience of Montana, ghost towns like this one now dot the landscape they once extracted.