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• W2278086670 abstract "RESUME Les residus miniers produits par le concentrateur sont generalement entreposes dans des parcs a residus, en surface. Les mineraux sulfureux qu’ils contiennent parfois (pyrite, pyrrhotite, arsenopyrite, etc.) peuvent reagir avec l’oxygene de l’air et l’eau pour former du drainage minier acide (DMA), caracterise par un pH faible, une conductivite electrique elevee, et d’importantes concentrations en sulfates et en metaux lourds. Les methodes de restauration applicables a la fermeture des sites visent a limiter l’acces de l’eau ou de l’oxygene aux residus reactifs. En climat humide, on peut limiter le mouvement de l’oxygene vers les residus avec des couvertures en eau, des couvertures a effets de barriere capillaire (CEBC) ou encore en utilisant la methode de la nappe surelevee. Chacune de ces techniques necessite une etude particuliere pour etre adaptee et optimisee pour le site etudie.Les travaux de restauration devraient etre bien planifies avant la fermeture du site et mis en place des la fin des operations ou rapidement apres. Les parcs a residus longtemps exposes aux intemperies sont souvent deja partiellement oxydes lorsque les travaux de restauration debutent. Des lors, le choix de la methode de recouvrement necessite de prendre en compte le passif de contamination, en particulier lorsque le pH de l’eau interstitielle est suffisamment bas pour permettre aux ions ferriques en solution d’oxyder de facon indirecte les mineraux sulfureux.La presente etude se concentre sur l’evaluation de techniques de restauration appliquees a deux parcs a residus miniers partiellement oxydes. Pour le site Manitou, pres de Val d’Or, la methode de restauration retenue consiste a installer sur les residus reactifs une couverture de residus legerement alcalins et non generateurs d’acide, couplee a une remontee de la nappe. Pour le site Selbaie, situe au nord de La Sarre, au Quebec, le parc a residus a ete partiellement restaure au moyen d’une couverture monocouche de moraine (till) de 1 a 2 metres d’epaisseur. Ces residus reactifs ont aussi ete partiellement oxydes et l’eau d’exhaure est acide et contaminee et doit etre traitee a la chaux avant d’etre retournee dans l’environnement.----------ABSTRACT Mine tailings, produced during ore treatment, are usually stored at surface disposal sites. The iron sulfides (pyrite, pyrrhotite, arsenopyrite, etc.) that the tailings may contain can react with oxygen and water to generate acid mine drainage (AMD). The resulting acidic effluent is generally characterized by high concentrations of dissolved metals and sulfates, a low pH and a high electrical conductivity. Reclamation methods at mine closure mainly tend to inhibit access of water or oxygen to the sulfide minerals. In humid climates, oxygen access can be decreased using water covers, covers with capillary barrier effects, or an elevated water table. Each technique needs to be adapted for the specific site conditions so that the design can be optimized.Reclamation work should be planned well ahead of the site closure and implemented near the end of operation or shortly thereafter to maximize efficiency. Old tailings sites that have been left exposed for some time typically include tailings that have been altered before the reclamation work starts. In such cases, the selected reclamation technique must take into account the contamination history of the site, especially when the pH of the leachate is low enough to maintain ferric ions in solution, which can then indirectly oxidize iron sulphide minerals.This study focuses on the evaluation of the efficiency of several reclamation methods applied to two partially oxidized tailings impoundments. At the Manitou mine site, located near Val-d'Or, Quebec, the adopted reclamation method consists of adding a layer of slightly alkaline (non acid generating) tailings onto the surface, together with an elevated water table. For the Selbaie mine site, located north of La Sarre, Quebec, the impoundment has already been covered by a 1 m to 2 m thick monolayer cover made of till. The reactive tailings have also been partially oxidized and the discharge water is acidic and contaminated, and has to be lime-treated.Reactive tailings and cover material (till) samples were collected in situ in 2007 from both disposal sites. Non acid-generating tailings were provided by the Goldex mine. These materials have been characterized in the laboratory to define their hydrogeological and geochemical properties (water retention curves, saturated hydraulic conductivity, oxygen diffusion and consumption parameters, mineralogical compositions, total C and S contents, etc.)." @default.
• W2278086670 created "2016-06-24" @default.
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• W2278086670 date "2011-09-01" @default.
• W2278086670 modified "2023-09-27" @default.
• W2278086670 title "Étude expérimentale et numérique du comportement hydro-géochimique de recouvrements placés sur des résidus sulfureux partiellement oxydés" @default.
• W2278086670 hasPublicationYear "2011" @default.
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