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Coal quality characteristics and evaluation of coal seam in Ningdong coalfield Yinxing No.1 Mine
Li Yonglu1, Mu Caixia 2, Hai Lianfu 3, Wei Xiangcheng 3, Tao Rui 3, Li Xuejun 3
1. Ningxia Yinxing Coal Industry Corporation Ltd., Lingwu 751400, China; 2. Ningxia Hui Autonomous Re gion Geological and Mineral Exploration Institute, Yinchuan 750021, China; 3. Mineral and Geological Survey Institute of Ningxia Hui Autonomous Region, Yinchuan 750021, China


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