The Oued Mellègue: Mining activity,stream sediments and dispersion of base metals in natural environments,North-western Tunisia |
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Authors: | A Mlayah E Ferreira da Silva F Rocha Ch Ben Hamza A Charef F Noronha |
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Institution: | 1. Centre de Recherche et de la Technologie des Eaux, BP 273 Soliman 2080, Tunisia;2. GEOBIOTEC-Dep. Geociências, Univ. Aveiro, 3810-193 Aveiro, Portugal;3. Faculté des Sciences de Bizerte, Tunisia;4. Dep. Geologia e Centro de Geologia da Universidade do Porto, Faculdade de Ciências, 4169-007 Porto, Portugal |
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Abstract: | In the Northwest of Tunisia, mining works have occurred in an area of vital water reserves and resources (Oued Mellègue and Oued Mejerda), which represent nearly 81% of total potential of water in the region. Demographic growth, insufficient drinkable water, agriculture and industrial plants are factors responsible for the strong demand of this resource. Water supply is done by an interconnected battery of dams built on the major watercourses, the first of which, the Mellègue dam, was erected in the 1960s. Nowadays, most of the mines are closed for almost two decades although one is still active: (Jerissa for Fe). It is important to emphasise the fact that there are millions of cubic metres of abandoned tailings, mainly from Pb–Zn–Ba mines, which are not surveyed, representing a serious threat to the environment. |
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Keywords: | Mining Tailings Trace metals Oued Mellè gue Principal Component Analysis Stream contamination |
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