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Geochemistry of surface waters in the vicinity of open pit mines at the Cay Cham deposit, Thai Nguyen province, northern Vietnam |
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| Authors: | Pham Tich Xuan Nguyen Van Pho O L Gas’kova S B Bortnikova |
| Institution: | 1. Geological Institute, Vietnamese Academy of Science and Technology, Hanoi, Vietnam 2. Sobolev Institute of Geology and Mineralogy, Siberian Branch, Russian Academy of Sciences, pr. akademika Koptyuga 3, Novosibirsk, 630090, Russia 3. Trofimuk Institute of Petroleum Geology and Geophysics, pr. akademika Koptyuga 3, Novosibirsk, 630090, Russia |
| Abstract: | This study provides an assessment of the environmental impact of open pit mining operations at the Cay Cham titanomagnetite-ilmenite deposit (northern Vietnam). The results of surface water sampling indicate the formation of acid mine drainage and contamination of adjacent areas by heavy metals (Cu, Zn, Ni, and Mn). The acid mine drainage is produced by oxidation leaching of sulfide minerals associated with primary mineralization owing to the low neutralization potential of the natural waters in the humid environment of tropical rainforest. The study showed that alternating dry and wet seasons typical of this climatic region promote the generation of stored acidity leading to a sharp decrease in pH of drainage water during the wet season and result in the negative impacts of this mine on both flowing and stagnant surface waters. |
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