The post-minig context at Decazeville-Firmi concession (Aveyron, France) : analysis of impacts resulting from the cessation of pumping at the central shaft. Survey of various scenarios related to the water level of the Pit lake in the Grande Decouverte

Abstract : Within the frame of the Survey related to the cessation of mine workings in Decazeville-Firmi concession, various impacts resulting from the cessation of pumping at the Central Shaft were assessed. Mainly these impacts are related to groundwater behaviour in the abandoned underground coalmines, hydrochemistry of waters discharged to the environment, ground stability concerns and coal gas emanations. This analysis allowed the choice of the most appropriate elevation of the pit lake level in the Grande Découverte, with the necessity to continue the pumping. Two main objectives were reached. The elected elevation is high enough to result in a permanent chemical stratification, which allows the pumping of the superficial waters and its discharge to natural watercourses without any treatment. The elected elevation is low enough to avoid any problem of inflow of water or ground stability at some particular places which might have been threatened by the rising of the piezometric level of the mining aquifer. Lastly, the elected elevation of the pit lake allows a quality scenery design around the pit lake.
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  • HAL Id : ineris-00972519, version 1
  • INERIS : PU-2005-243

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Roger Cojean, Nicolas Franco, Jean-Claude Lazarewicz, Agnès Blachere, Dorothée Lefort, et al.. The post-minig context at Decazeville-Firmi concession (Aveyron, France) : analysis of impacts resulting from the cessation of pumping at the central shaft. Survey of various scenarios related to the water level of the Pit lake in the Grande Decouverte. Symposium Post mining 2005, Nov 2005, Nancy, France. pp.NC. ⟨ineris-00972519⟩

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