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Mineralogical Changes Caused by the Weathering of Tailings Deposited on the Riverside of the Nakdong River, Bonghwa, Korea  

Kim, Min-Jung (Department of Geology, Kyungpook National University)
Kim, Yeong-Kyoo (Department of Geology, Kyungpook National University)
Park, Hyoung-Sim (Department of Geology, Kyungpook National University)
Jeon, Sang-Ho (Department of Geology, Kyungpook National University)
Publication Information
Journal of the Mineralogical Society of Korea / v.21, no.4, 2008 , pp. 331-339 More about this Journal
Abstract
In the upstream of Nakdong river in Bonghwa-gun, Gyeongsangbuk-do, certain areas of riverside were found to be covered by weathered mine tailings which were assumed to be migrated and deposited by flood. This study was conducted to investigate the formation and characteristics of the secondary minerals from tailings and related leaching behavior of heavy metals in the severely weathered tailing deposits by river waters. Quartz, feldspar, micas, chlorite, hornblende, talc, pyroxene (johannsenite), pyrite, and calcite were identified as primary minerals by XRD. Kaolinite can be formed by the weathering of tailings, but considering the short period of weathering time, kaolinite in the deposits is considered to be from unweathered tailings or moved from soils. The secondary minerals such as goethite, gypsum, basanite, and jarosite were also identified. The formation of the secondary minerals was affected by the species of primary minerals and pH conditions. The weathering of pyrite produced sulfate minerals such as gypsum, basanite, jarosite, and also goethite. Mn oxide was also identified by SEM, coated on the primary minerals such as quartz. This Mn oxide was poorly crystalline and thought to be the weathering product of johannsenite (Mn-pyroxene). The Fe and Mn oxides are the main minerals determining the brown/red and black colors of weathered tailings. EDS results showed that those oxides contain high concentrations of Pb, Zn, and As, indicating that, in the river, the formation of Fe and Mn oxides can control the behavior and leaching of heavy metals by co-precipitation or adsorption.
Keywords
tailings; weathering; secondary minerals; heavy metals; goethite; Mn oxide;
Citations & Related Records
Times Cited By KSCI : 3  (Citation Analysis)
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