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Heavy metal(loid) pollution in mine wastes of a Carlin-type gold mine in southwestern Guizhou, China and its environmental impacts 被引量:9

Heavy metal(loid) pollution in mine wastes of a Carlin-type gold mine in southwestern Guizhou, China and its environmental impacts
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摘要 Mercury pollution resulting from artisanal gold mining is a serious environmental problem in many developing countries. In this study, we analyzed heavy metal(loid) contamination in mine wastes from a Carlin-type gold mine in southwestern Guizhou, China. Highly elevated levels of As, Hg, Tl, Sb, and Cd—up to 5844, 28,29, 581 and 3.0 mg/kg, respectively—were observed in the mine wastes, but no significant accumulation of Cr, Ni, Cu,Zn, and Pb was found. The smelting process of gold ores had significant impacts on the enrichment of As, Tl, and Hg in the mine wastes. Due to the significant metal(loid)pollution in this gold mine, the ecological risks are classified as ‘‘very high.'' Hg and As are the major pollutants with a relative contribution of 55.9 % and 24.2 % to the risk index, respectively. Phytoremediation could be used to reduce heavy metal contamination and recycle the gold simultaneously. Hg–As–Tl pollution should be considered in gold extraction at Carlin-type gold mines. Mercury pollution resulting from artisanal gold mining is a serious environmental problem in many developing countries. In this study, we analyzed heavy metal(loid) contamination in mine wastes from a Carlin-type gold mine in southwestern Guizhou, China. Highly elevated levels of As, Hg, Tl, Sb, and Cd--up to 5844, 28, 29, 581 and 3.0 mg/kg, respectively--were observed in the mine wastes, but no significant accumulation of Cr, Ni, Cu, Zn, and Pb was found. The smelting process of gold ores had significant impacts on the enrichment of As, Tl, and Hg in the mine wastes. Due to the significant metal(loid) pollution in this gold mine, the ecological risks are classified as "very high." Hg and As are the major pollutants with a relative contribution of 55.9 % and 24.2 % to the risk index, respectively. Phytoremediation could be used to reduce heavy metal contamination and recycle the gold simultaneously. Hg-As-Tl pollution should be considered in gold extraction at Carlin-type gold mines.
出处 《Chinese Journal Of Geochemistry》 EI CAS CSCD 2015年第3期311-319,共9页 中国地球化学学报
基金 funded by the West Light Foundation of the Chinese Academy of Sciences the Social Development Project of Guizhou Province (2012–3044) the Natural Science Foundation of Guizhou Province (2009–2003) the National Natural Science Foundation of China (21007068 and 41373135)
关键词 卡林型金矿 重金属污染 废弃物污染 发展中国家 矿山废弃物 西南部 环境影响 贵州 Heavy metals Metalloid Potentialecological risk assessment Enrichment factor Mine waste Carlin-type gold mine
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