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Drainage of old goaf water by Long-distance directional drilling and water quantity calculation method
Chen Zixin1, Zhao Baofeng2, 3, Zhao Junjie1
1. Jinfeng Coal Mine of Ningxia Coal Industry Co., Ltd., National Energy Group, Yinchuan 750011, China; 2. Xi 'an Research Institute ( Group ) Co., Ltd., Xi 'an 710054, China; 3. Shaanxi Provincial Key Laboratory of Coal Mine Water Disaster Prevention and Control Technology, Xi 'an 710177, China


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