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Historic photograph of the Treadwell mine buildings on the Douglas Island shore

Gold mine

Treadwell Mine Ruins

Ruins of the Douglas Island complex that was once the largest hard-rock gold mine in the world.

Reference 36

Mine status
Historic
Mine type
Hard-rock (lode) gold
Discovered year
1881
Operating years
1881–1922
Total production oz
3000000

The Treadwell complex on Douglas Island ran from 1881 to 1922 and produced more than 3 million troy ounces of gold; at its peak it was the largest hard-rock gold mine in the world, employing over 2,000 people. In 1917 the Treadwell, 700-Foot and Mexican mines, dug below Gastineau Channel, flooded and collapsed. Little remains beyond crumbling buildings and the glory hole; the Treadwell Historic Preservation and Restoration Society maintains trails with markers through the site. The Treadwell Ditch, which once carried the mine’s water, is now a long trail across the island.

Location

In pictures

Hiking · Cultural tours

Sources

Last updated 2026-11-09

Nearby within 25 miles

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