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Dredging can be done to recover materials of commercial value; these may be high value minerals or sediments such as sand and gravel that are used by the construction industry. [ 2 ] Dredging is a four-part process: loosening the material, bringing the material to the surface (together extraction), transportation and disposal.
In the late 1960s and through today, dredging has returned as a popular form of gold mining. Advances in technology allow a small dredge to be carried by a single person to a remote location and profitably process gravel banks on streams that previously were inaccessible to the giant dredges of the 1930s. [13]
A process known as elutriation is used, whereby flowing water separates the grains based on their size, shape, and density. Sand mining is a direct cause of erosion, and impacts the local wildlife. [6] Various animals depend on sandy beaches for nesting clutches, and mining has led to the near extinction of gharials (a species of crocodilian ...
Land dredging is also another method of land reclamation. It is the removal of sediments and debris from the bottom of a body of water. It is commonly used for maintaining reclaimed land masses as sedimentation, a natural process, fills channels and harbors.
A suction excavator, or vacuum excavator, is a construction vehicle that removes heavy debris or other materials from a hole on land using vacuuming. Suction excavators are meant to be less destructive than regular excavators . [ 1 ]
The company was founded in 1890 as the partnership of William A. Lydon & Fred C. Drews and was named Lydon & Drews dredging company. Early projects included the shoreline structures for the Chicago's Columbian Exposition. The company soon had satellite operations throughout the Great Lakes. It was renamed the Great Lakes Dredge and Dock Company ...
Weeks Marine is a marine construction and dredging contractor based in Cranford, NJ. [1] It was founded by Francis Weeks and his son Richard B. Weeks in 1919 as the Weeks Stevedoring Company . [ 2 ]
One or more, Dredging pumps to create an under pressure in order to suck the substance into the hopper; Transportation tubes to transport the substance from the pipes to the hopper; An overflow to discharge the redundant water overboard; Degassing installation to extract any possible gas from the substance in order to reduce damage and increase ...