Argo Tunnel, Mining adit in Idaho Springs, US
The Argo Tunnel extends 4.16 miles through the Rocky Mountains, connecting multiple gold mines between Idaho Springs and Central City through a drainage system.
Construction of the Argo Tunnel began in September 1893 and continued until November 1910, creating a passage that intersected major gold deposits in Colorado.
The tunnel represents the determination of Colorado miners who engineered this extensive underground network during the regional mining expansion of the 19th century.
Visitors can access the Argo Tunnel site at 2517 Riverside Drive in Idaho Springs, where guided tours explain the mining processes and drainage systems.
The tunnel features a precise half-percent grade throughout its entire length, enabling natural water drainage from the connected mine network.
Location: Idaho Springs
Part of: Argo Tunnel and Mill
GPS coordinates: 39.74360,-105.50777
Latest update: March 4, 2025 18:37
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