Argo Tunnel - Wikipedia
The Argo Tunnel is a 4.16-mile (6.69 km) mine drainage and access tunnel with its portal at Idaho Springs, Colorado, USA.It was originally called the Newhouse Tunnel after its primary investor, Salt Lake City mining magnate Newhouse, and appears by that name in many industry publications from the time period when it was constructed.The tunnel intersected nearly all the major gold mines ...
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