Copper King Mansion

William A. Clark began building his Butte mansion in 1884, as copper was transforming the city and intensifying competition among the men known as the Copper Kings. The three-story, thirty-room house was completed four years later at a cost reported at about $260,000. Its scale and imported materials made it a statement of private wealth on a hillside above a city whose prosperity depended on miners, smelters, and industrial labor.

Clark’s fortune came from more than one source. He was involved in mining and smelting, but also invested in electric power, newspapers, railroads, and other enterprises. His mansion’s rich interior—described in preservation records through its plasterwork, stained glass, and ornate rooms—expressed the reach of that wealth. The contrast between the residence and the working neighborhoods below it reflects Butte’s sharp economic divisions during the copper boom.