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A grab dredge. Dredging is the excavation of material from a water environment. Possible reasons for dredging include improving existing water features; reshaping land and water features to alter drainage, navigability, and commercial use; constructing dams, dikes, and other controls for streams and shorelines; and recovering valuable mineral deposits or marine life having commercial value.
Gold Dredge, Klondike River, Canada, 1915 The Yankee Fork dredge near Bonanza City, Idaho, which operated into the 1950s. A gold dredge is a placer mining machine that extracts gold from sand, gravel, and dirt using water and mechanical methods. The original gold dredges were large, multi-story machines built in the first half of the 1900s.
Amends the Water Resources Development Act of 1990 to add environmental remediation in the removal of dredged material under a navigation project; and (2) increase funding for the removal of contaminated sediments from navigable waters. Lists specified projects to be given priority in such sediment removal.
The Yuba Goldfields, also known as the Hammonton dredge field, is the largest gold dredge field in California. Located along the Yuba River approximately 6–12 miles (10–20 km) upstream of the town of Marysville , in Yuba County , the Hammonton dredge field was actively dredged for gold from 1904 [ 1 ] to 1968. [ 2 ]
Uncontaminated dredged material from the South Channel and the Great Ship Channel was to be disposed of in a dredged material ground yet to be built in the south east part of the bay, expected to cover an area of 7.68 km 2 (2.97 sq mi) (or approximately 0.39% of the bay area).
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A spoil tip (also called a boney pile, [1] culm bank, gob pile, waste tip [2] or bing) [3] is a pile built of accumulated spoil – waste material removed during mining. [4] Spoil tips are not formed of slag, but in some areas, such as England and Wales, they are referred to as slag heaps. In Scotland the word bing is used.
The tubes facilitate oyster reef development and create areas to dispose of new dredge material. [1] Geotextile tubes are also installed for land reclamation and temporarily installed during the dewatering phase of a dredging operation. If a geotextile tube is exposed to the elements, it can be vulnerable to bursting. [2]
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