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TitreFactors affecting methylmercury levels in surficial tailings from historical Nova Scotia gold mines
AuteurWinch, S; Fortin, D; Lean, D R S; Parsons, M
SourceGeomicrobiology Journal vol. 25, 2008 p. 112-129, https://doi.org/10.1080/01490450801934979
Année2008
Séries alt.Secteur des sciences de la Terre, Contribution externe 20080357
ÉditeurInforma UK Limited
Documentpublication en série
Lang.anglais
DOIhttps://doi.org/10.1080/01490450801934979
Mediapapier; en ligne; numérique
Formatspdf
ProvinceNouvelle-Écosse
SNRC11D/11; 11F/04
Lat/Long OENS-63.2042 -63.1919 44.7400 44.7319
Lat/Long OENS-61.5792 -61.6417 45.2083 45.1583
Sujetsrésidus; élimination des résidus; analyses des résidus; géochimie des résidus; or; mercure; bactéries; analyse environnementales; etudes de l'environnement; contamination des métaux lourds; méthodes d'exploitation minière; historique de l'exploitation minière; géochimie des eaux lacustres; géochimie de l'eau de cours d'eau; analyses de l'eau; géochimie de l'eau; géologie de l'environnement; géochimie; hydrogéologie
Illustrationsgeochemical profiles; location maps
ProgrammeEnvironnement et santé
Résumé(disponible en anglais seulement)
Large quantities of Hg remain in tailings dumps from historical Nova Scotian gold mines. Depth profiles of total Hg (HgT) and methylmercury (MeHg) were compared with geochemical and microbiological variables, to identify factors influencing MeHg levels in tailings. HgT and MeHg were highly variable in tailings (0.2 - 73.5 µmol kg-1 and < dl-56.4 nmol kg-1, respectively), and were influenced by a complex set of in situ factors. Elevated MeHg was linked with > 5 µmol kg-1 HgT, organic matter, hydrology, abundance and activity of sulfate reducing bacteria, and demethylation processes. Methylmercury levels in tailings from a wet, bog-like site appeared to undergo seasonal fluctuations, with higher concentrations measured in September and October, and lower concentrations in May. Evaluations of amalgamation tailings should examine MeHg and HgT transport out of low-lying, saturated tailings dumps after snowmelt and major rainfall events, and should take into account the possibility of seasonal variation in MeHg levels in northern regions.
GEOSCAN ID225742