Adit
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An adit or stulm is a horizontal or nearly horizontal passage to an underground mine. Miners can use adits for access, drainage, ventilation, and extracting minerals at the lowest convenient level. Ad
Gated entrance of an abandoned adit near Medford, Oregon, United States
Queen Louise adit, Zabrze, Poland
Horse adit in the abandoned lead mine, Nenthead, County Durham, UK
Two Brothers Adit, a small surviving mine entrance at the site of Eylesbarrow mine, Dartmoor, Devon
Sutro Tunnel
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The Sutro Tunnel is a drainage tunnel connected to the Comstock Lode in Northern Nevada. It begins at Dayton, Nevada, and connects 3.88 miles Northwest to the Savage mine in Virginia City, Nevada. The
Adit
…the Great County Adit in Cornwall, a 40-mile-long (64 km) network of adits that used to drain the whole Gwennap mining area, and the 3.9 miles (6.3 km) Sutro Tunnel at the Comstock Lode in Virginia City, Nevada. A side benefit of driving such extensive adits is that previously unknown ore-bodies can be discovered…
The entrance to the Sutro Tunnel in the late 1800s
Nevada Lawmakers visiting the Sutro Tunnel to see the work that the Friends of Sutro Tunnel have done to preserve and restore this significant part of Nevada's history.