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Gold Mining Mining Machine Names Ncv Coal Calculation

Sep 01, 2017 From the perspective of the mining economy and energy management, Epstein et al. (2011) discussed the external costs of the life cycle of coal, including the stage of coal mining. Zheng et al. (2008) constructed a full cost system consisting of resource cost, security cost, environmental cost, development cost and production cost. Qian (2010) proposed that the scientific mining primarily.

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