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The basic concept of retrieving gold via placer mining has not changed since antiquity. The rocks deposited behind the dredge (by the stacker) are called 'tailing piles.' The holes in the screen were intended to screen out rocks (e.g., 3/4 inch holes in the screen sent anything larger than 3/4 inch to the stacker). The material that is washed or sorted away is called tailings. The cylinder has many holes in it to allow undersized material (including gold) to fall into a sluice box. On large gold dredges, the buckets dump the material into a steel rotating cylinder (a specific type of trommel called 'the screen') that is sloped downward toward a rubber belt (the stacker) that carries away oversize material (rocks) and dumps the rocks behind the dredge.

The material is then sorted/sifted using water.

Small suction machines are currently marketed as 'gold dredges' to individuals seeking gold: just offshore from the beach of Nome, Alaska, for instance.Ī large gold dredge uses a mechanical method to excavate material (sand, gravel, dirt, etc.) using steel 'buckets' on a circular, continuous 'bucketline' at the front end of the dredge.

The original gold dredges were large, multi-story machines built in the first half of the 1900s. Gold Dredge, Klondike River, Canada, 1915 The Yankee Fork dredge near Bonanza City, Idaho, which operated into the 1950s.Ī gold dredge is a placer mining machine that extracts gold from sand, gravel, and dirt using water and mechanical methods. For the historic landmark in the United States, see Gold Dredge.

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