Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Environmental Contamination and Sequential Extraction of Trace Elements from Mine Wastes Around Various Metalliferous Mines in Korea
This study has focused on the environmental problems of toxic trace elements from mine wastes including tailings around various abandoned metalliferous mines in Korea. 48 mine wastes were sampled in and around 38 abandoned mines classified as 3 groups (Au-Ag, base metal and other mines) with 5 types by their ore minerals and mineralization. Wide ranges of pH values were found in the wastes derived from the weathering process of parent rocks; relatively low pH due to the oxidation of sulfide minerals (mainly pyrite) and high pH related to the interaction with carbonate minerals (mainly calcite) or to absence of sulfide minerals. Based on the 0.1N HCl extraction analysis, elevated levels of Cd, Cu, Pb and Zn were found in a few mine wastes, especially for type 2 (Au-Ag mine mineralized by a hydrothermal vein type with sulfide minerals), and some wastes from types 4 (skarn type) and 5 (others) contained over the guidelines (action level) of Cd and/or Cu under the Soil Environment Preservation Act in Korea. In addition, extremely high concentrations of the metals were also found in the mine wastes extracted by aqua regia compared to soils from uncontaminated natural areas. This was also confirmed by the results of sequential extractions performed on representative samples, which showed high proportions of the metals in exchangeable fractions of the acidic mine wastes. Thus, it can be expected that trace elements in the mine wastes may be dispersed both downstream and downs-lope through water and wind. Eventually they may pose a potential health risk to residents in the vicinity of the mine. Therefore, it is necessary to control the mine wastes with a proper method for their reclamation such as neutralization of the mine wastes using pulverized limestone.
Environmental Contamination and Sequential Extraction of Trace Elements from Mine Wastes Around Various Metalliferous Mines in Korea
This study has focused on the environmental problems of toxic trace elements from mine wastes including tailings around various abandoned metalliferous mines in Korea. 48 mine wastes were sampled in and around 38 abandoned mines classified as 3 groups (Au-Ag, base metal and other mines) with 5 types by their ore minerals and mineralization. Wide ranges of pH values were found in the wastes derived from the weathering process of parent rocks; relatively low pH due to the oxidation of sulfide minerals (mainly pyrite) and high pH related to the interaction with carbonate minerals (mainly calcite) or to absence of sulfide minerals. Based on the 0.1N HCl extraction analysis, elevated levels of Cd, Cu, Pb and Zn were found in a few mine wastes, especially for type 2 (Au-Ag mine mineralized by a hydrothermal vein type with sulfide minerals), and some wastes from types 4 (skarn type) and 5 (others) contained over the guidelines (action level) of Cd and/or Cu under the Soil Environment Preservation Act in Korea. In addition, extremely high concentrations of the metals were also found in the mine wastes extracted by aqua regia compared to soils from uncontaminated natural areas. This was also confirmed by the results of sequential extractions performed on representative samples, which showed high proportions of the metals in exchangeable fractions of the acidic mine wastes. Thus, it can be expected that trace elements in the mine wastes may be dispersed both downstream and downs-lope through water and wind. Eventually they may pose a potential health risk to residents in the vicinity of the mine. Therefore, it is necessary to control the mine wastes with a proper method for their reclamation such as neutralization of the mine wastes using pulverized limestone.
Environmental Contamination and Sequential Extraction of Trace Elements from Mine Wastes Around Various Metalliferous Mines in Korea
Jung, Myung Chae (Autor:in) / Ahn, Joo Sung (Autor:in) / Chon, Hyo-Taek (Autor:in)
Geosystem Engineering ; 4 ; 50-60
01.06.2001
11 pages
Aufsatz (Zeitschrift)
Elektronische Ressource
Unbekannt
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