Mineral assemblage of sulfide-bearing waste ores and its environmental implication in Dongguashan Cu-Au Mine, Tongling, Anhui Province

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Journal of Nanjing University(Natural Sciences) ›› 2013, Vol. 49 ›› Issue (6) : 689.

LI Juan, LU Jian-Jun*, LU Xian-Cai, LIU Huan, ZHU Xiang-yu, OUYANG Bing-jie

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Abandoned mine-waste dump pose potential environmental hazards. The oxidation of sulfide is the main contributor to the acidification and heavy metal pollution in mine tailings. Therefore, determining which minerals are present , the origin and distribution as well as the cause of formation of the waste ores, understanding the chemical heterogeneity provide evidences for which minerals (control the acidification of water and which soluble minerals contain metals that could be released. Our studies were focused on the mineralogy and geochemistry for six samples originated from the mine-waste dump of the Shizishan sulfide mine in Tongling, Anhui. We carried out XRD, SEM-EDS and TEM analysis to determine the component of the minerals present in the altering waste ores and the morphological features of minerals surface and their element heterogeneity. The major authigenic minerals identified are represented by pyrite, sphalerite and quartz, the secondary minerals are represented by illite, albite, goethite, limonite, hematite and jarosite. Secondary highly complex Fe-minerals are generated from microbial activity. Under different environment and during exposure or storage, pyrite was oxidized to varies of morphological features and sorts (the sulphates minerals and the oxides and hydroxides minerals) of secondary minerals. This process plays a large role in the environmentally damaging phenomenon known as acid mine drainage and releasing of heavy metal As ions.

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LI Juan, LU Jian-Jun*, LU Xian-Cai, LIU Huan, ZHU Xiang-yu, OUYANG Bing-jie. Mineral assemblage of sulfide-bearing waste ores and its environmental implication in Dongguashan Cu-Au Mine, Tongling, Anhui Province[J]. Journal of Nanjing University(Natural Sciences), 2013, 49(6): 689

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