Known worldwide as the "Richest Hill on Earth," Butte, Montana, lured immigrants from every part of the world to sweat in the copper mines that powered America in its Gilded Age. Dozens of writers celebrated this "wide-open town" with impassioned novels of the rugged souls who braved the western frontier at the edge of the Continental Divide. They wrote of the opulence of success and the agony of broken dreams. They catalogued the clash between labor...