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After 50 years of coal mining, Huaibei Mine, located at 50km southeast of Xuzhou City in East China, has grown to a middle-size city of 600,000 people from a small village of 2000 farmers. The Zhahe Valley, with 400km 2 of a built-up area and more than 100km 2 of subsided peri-urban wetland at the city center, is surrounded by eight exhausted old mines and communities. In cooperation...
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