shandong energy zao mining group zhongxing construction an engineering co., ltd. is a large state-owned enterprise under the province, which is a large comprehensive construction enterprise integrating mine construction, construction, mechanical and electrical equipment installation, geological exploration, prefabricated steel structures, municipal public works, commercial concrete, etc.
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shandong tianan mining group co., ltd. shandong tianan mining group co., ltd. is a private enterprise mainly engaged in coal, petroleum storage and transportation, chemical industry, real estate, and metal exploration. the coal industry was established in yangzhuang coal mine in 1978 and was reorganized into datong mining co., ltd. in december 2002.
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