http://idl-bnc.idrc.ca:80/dspace/handle/10625/49271 2013-05-18T12:13:04Z http://idl-bnc.idrc.ca:80/dspace/handle/10625/49745 Title: Laboratory Evaluation of the Use of Alkaline Phosphate Wastes for the Control of Acidic Mine Drainage Authors: Hakkou, R; Benzaazoua, M; Bussière, B Abstract: Pyrrhotite tailings at the abandoned Kettara mine site in Morocco are producing acid mine drainage (AMD). We investigated the use of alkaline phosphate waste (APW) rock from a nearby operating open-pit phosphate mine to control the AMD. The neutralizing potential of the APW, using the Paktunc method, was estimated between 500 and 680 kg CaCO3/t. In laboratory column tests, the addition of 15 wt% APW to the coarse Kettara tailings produced leachates with significantly lower acidities and metal concentrations than unamended controls. The high calcium concentration in the flushed solutions indicates that calcite was responsible for the neutralization. Dolomite dissolution seems to be negligible and fluorapatite was stable under the testing conditions. It was also observed that when the treated solution comes in contact with unweathered Kettara coarse tailings, the pH becomes acidic, although the metal concentrations remain low. 2009-07-01T00:00:00Z http://idl-bnc.idrc.ca:80/dspace/handle/10625/49744 Title: Etude géophysique et hydrogéologique du site minier abandonné de Kettara (région de Marrakech, Maroc): contribution au projet de réhabilitation Authors: Lghoul, M; Kchikach, A; Hakkou, R; Zouhri, L; Guérin, R Abstract: Les rejets sulfurés de la mine abandonnée de Kettara, située à 30 km au Nord-Nord-Ouest de Marrakech, sont directement entreposés sur un substratum schisto-gréseux fracturé. D'une superficie d'environ 16 ha, ils constituent une réelle source de pollution pour l'écosystème local en particulier à cause du Drainage Minier Acide (DMA) vers les eaux de surface et de la nappe phréatique. Le projet de réhabilitation du site minier de Kettara prévoit dans l'un de ses axes de minimiser l'effet DMA par neutralisation à l'aide de dépôts stériles riches en carbonates issus de l'extraction des phosphates de la mine de Youssoufia voisine. Ces derniers seront utilisés à la fois comme amendement des rejets miniers acides et comme couverture évapo-transpirante (barrière capillaire). Notre étude a permis d'une part, de mieux appréhender la nature et la structure du parc à résidus et de son substratum et d'autre part, de caractériser l'impact de ces résidus sur la qualité des ressources en eau souterraine. Les résultats issus de cette étude vont contribuer à la réussite du projet de réhabilitation du site.; The sulphurated mine waste of the abandoned Kettara pyrrhotite mine, located approximately 30 km north-northwest of Marrakech, Morocco, has been deposited on a fractured schistous substratum. Over an area of about 16 ha, this mine waste threatens the local ecosystem with pollution, particularly due to the infiltration of acid mine drainage (AMD) via surface waters towards the groundwater. As part of the rehabilitation project at the Kettara mine, it is proposed to minimize the effect of AMD by neutralization using fine sterile carbonate-rich deposits that are by-products of phosphate extraction in the neighbouring Youssoufia mine. These by-products are used both as amendement for the acidic mine waste and as a capillary barrier to allow evapotranspiration. On the one hand, our study has allowed a better understanding of the structure of the tailings pond and of the substratum, and on the other hand, it has made it possible to characterize the impact of the mine waste on groundwater quality. The results of this study will contribute to the success of the site rehabilitation project. Description: Abstract and keywords provided in French and English 2012-01-01T00:00:00Z