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     · Dredging picked up in Cambodia after Indonesia abruptly banned sand exports in 2007. Prior to the ban, more than 275,000 tons of sand were being exported every month from Indonesia's Riau Islands, according to the Global Witness report, and two islands — Nipah and Sebaik — nearly vanished because of extensive dredging. The Indonesian government had .

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     · Rapid urbanization has created a world obsessed with concrete. Between 2011 and 2013, China used more concrete than the US did in the entire 20th century. But we're beginning to run out of a key ...

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  • Asia's hunger for sand takes a toll on endangered species ...

     · But sand dredging campaigns in the middle Yangtze Basin have expanded rapidly since the early 2000s, when such activities were banned on sections of the lower Yangtze. "Sand mining has significantly lowered the water level, especially in winter," says Lai Xijun, an environmental hydrologist at the Nanjing Institute of Geography and Limnology in China. .

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  • Is Cambodia Dredging its Rivers to Death?

     · Dredging picked up in Cambodia after Indonesia abruptly banned sand exports in 2007. Prior to the ban, more than 275,000 tons of sand were being exported every month from Indonesia's Riau Islands, according to the Global Witness report, and two islands — Nipah and Sebaik — nearly vanished because of extensive dredging. The Indonesian government had to go back and fill in Nipah in order .

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    Our factory is the first professional manufacturer which develops and produces sanddigging machinery, sand making machinery, dredging machinery and mineral processing machinery in China. It mainly produces kinds of sand dredgers, cutter suction dredgers, jet sand dredgers, chain bucket dredgers, sand washing machines, gold mining machines, iron extraction machines, PE pipelines, HDPE float ...

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    Dredging refers to the underwater excavation of silt, soil and sand. The process of dredging comprises of these below mentioned steps: Underwater Dredging: This is done by deploying back hoe dredgers / grab dredgers / cutter suction dredgers and Trailer suction dredgers; Transporting the dredged material: This is done by following methods: Slurry dredged material is transported through ...

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     · In 1991, when sand dredging began in the lake, approximately 4,000 porpoises lived in the Yangtze system, including Poyang and Dongting lakes. A 2006 study estimated about 1,800, and a 2012 study estimated about 1,100 remaining. Unregulated fishing and 20 billion tonnes of waste discharged into the Yangtze system every year contribute to the decline. Most of the sand dredged from the .

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