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ng Wikipedia Mining WikipediaChinese20191028 ensp 0183 enspMining is the extraction of valuable minerals or other geological materials from the Earth usually from an ore body lode vein seam reef or placer deposit These deposits form a mineralized package that is of economic interest to the miner Ores recovered by mining include metals coal oil shale gemstones limestone chalk dimension History ensp 0183 ensp

Mining and dredging of sand and gravel have entrained major environmen tal effects and French Atlantic coasts or on the Belgian North Sea coast to supply artifi the trailer dredger a k a trailer suction hopper dredger has a dredging

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20141117 ensp 0183 enspThe Cutting of Sand Clay amp Rock Equipment By Dr ir Sape A Miedema The Cutting of Sand Clay amp Rock Equipment Lecture notes for the course OE4626 Dredging Processes for the MSc program Offshore amp Dredging A deep sea mining clamshell Seatools Figure 67 Examples of clamshell grab dredges

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Dredging is an excavation activity usually carried out underwater in shallow seas or freshwater This is often carried out with a trailing suction hopper dredge Beach nourishment mining sand offshore and placing on a beach to replace sand A bucket dredger is equipped with a bucket dredge which is a device that

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Mechanical Dredgers Mechanical Dredgers use a bucket clamshell or other mechanical means to scoop the material from the bottom If the material cannot be discharged close to the dredger then it must be stored for subsequent transport