Begun in 1893, the Argo Tunnel extends approximately five miles toward Central City at an average depth of 1,800 feet.
It was designed by local mining entrepreneur Sam Newhouse to transport ores from area gold mines. The Argo Mill dates from 1913. The hillside location of the sprawling complex’s interconnected structures is clearly visible from I-70. Primarily constructed with a steel frame surfaced with corrugated iron panels, portions of the mill rise to a height of nearly seven stories. The operation closed after a mine disaster in 1943, and the mill has been operated as a museum/tourist attraction since the late 1970s. The property is associated with the Mining Industry in Colorado. Multiple Property Submission.