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Mineralogy and the Behavior of Heavy Metals at Different Depths in Tailing Impoundment of the Samsanjeil mine  

Kim, Heong-Jung (Department of Geology, Kyungpook National University)
Kim, Yeong-Kyoo (Department of Geology, Kyungpook National University)
Choo, Chang-Oh (Department of Geology, Kyungpook National University)
Publication Information
Journal of the Mineralogical Society of Korea / v.22, no.3, 2009 , pp. 229-240 More about this Journal
Abstract
In Gosung, the symptoms similar to itai-itai disease from neighboring residents of the Samsanjeil mine have been social issues. Therefore, various researches on the behavior of heavy metals of the tailings impoundment of 280,000 ton in the Samsanjeil mine are required. In this paper, mineralogical and geochemical studies on the tailings at different depths in the Samsanjeil mine were investigated and the factors on the behavior of heavy metals were also studied. At two sampling sites (NN and SN), samples were collected at different depths down to 1 m. At NN sites, pH values decreased with depth, while those at SN sites did not show significant changes. XRD analysis showed that the main minerals in the tailings were quartz, microcline, muscovite, and chlorite with minor amount of gypsum. There were no noticeable changes in the mineral composition with depth. At NN sites, the amount of calcite was negligible, and jarosite, which usually occurs at acid soil or acid mine drainage at pH lower than 4, was identified. However, the samples at SN site contained relatively high contents of calcite with pyrite. Therefore, calcite seemed to buffer the acid and control pH at SN site. The contents of heavy metals in tailings were in the order of Cu > As > Zn > Pb > Co > Cr > Ni > Cd. The heavy metal concentrations in the tailings were closely related with pH changes. The concentrations of Cd and Co were much lower at NN site at which pH values are low than those at SN sites. Contrary to that, Cr and As which exist as oxyanions showed higher concentrations at SN sites. This result showed that the behaviors of heavy metals in our study area were controlled by pH which is influenced by the contents of calcite.
Keywords
Samsanjeil mine; tailings; calcite; heavy metal; pH;
Citations & Related Records
Times Cited By KSCI : 7  (Citation Analysis)
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