GEOSCAN, résultats de la recherche


TitreEnvironmental indices of metal mining effects downstream of the Aldermac site, Abitibi, Quebec
AuteurMilne, L A; Alpay, S; Dixon, D G; Grapentine, L C; Grenier, A; McNeil, R; Norwood, W P; White, H P
SourceMines and the Environment Symposium 2011, abstracts volume; 2011.
Séries alt.Secteur des sciences de la Terre, Contribution externe 20110210
RéunionMines and the Environment Symposium 2011; Rouyn-Noranda; CA; 2011
SNRC32D/06; 32D/11
Lat/Long OENS-79.5000 -79.2250 48.3167 48.1736
Sujetstélédétection; analyses géochimiques; géochimie des éléments en trace; revalorisation de l'emplacement de la mine; résidus miniers; exhaure des mines acides; sédiments de fond; eaux de surface; Mine Aldermac ; géologie de l'environnement
ProgrammeEcosystems Risk Characterization, Géoscience de l'environnement
Résumé(disponible en anglais seulement)
Environmental sustainability of mining activities necessitates identification of key indicators of contamination and recovery. The former Aldermac mine in north-western Quebec exploited massive sulphide lenses from 1932-1943 that produced Cu, Zn, Au and Ag, generating acid mine drainage downstream. A multi-disciplinary approach that includes ecotoxicology, benthic community analysis, aquatic chemistry, geochemistry and remote sensing was launched June 2010 in the receiving waters of the Lac Dasserat watershed.
In September 2011, trace element distributions and aquatic toxicity studies were initiated using lake water and sediments from multiple sites. A three-dimensional bioassessment will be achieved by measures of bioavailability and toxicity of water-borne and sediment-bound metals from contaminant gradients across lake transects (spatial), sediment cores (historical) and over a number of seasons and years (temporal).
The overall goal of the Lac Dasserat study is to assess recovery of aquatic ecosystem components from adverse effects of exposure to acid mine drainage. Specific objectives are to develop: (1) performance measurement indices to evaluate remediation or restoration of mine sites; (2) tools to distinguish between multiple contaminant sources in receiving aquatic systems for practical use in environmental risk assessment; and (3) ecotoxicological approaches for assessing metal mixtures and their cumulative effects in natural waters.