GEOSCAN, résultats de la recherche


TitreGeoenvironmental characteristics of Canadian critical metal deposits / Caractéristiques géoenvironnementales de gisements métalliques critiques au Canada
TéléchargerTéléchargement (publication entière)
AuteurParsons, M
SourcePublic presentations: Environmental Geoscience Program, current status of research projects, May 2017; par Jacob, N; Ahad, J; Gammon, P; Rivard, C; Kao, H; White, D; Parsons, M; Galloway, J; Commission géologique du Canada, Présentation scientifique 70, 2017 p. 89-110, (Accès ouvert)
ÉditeurRessources naturelles Canada
Documentpublication en série
Mediaen ligne; numérique
Référence reliéeCette publication est contenue dans Jacob, N; Ahad, J; Gammon, P; Rivard, C; Kao, H; White, D; Parsons, M; Galloway, J; (2017). Public presentations: Environmental Geoscience Program, current status of research projects, May 2017, Commission géologique du Canada, Présentation scientifique no. 70
Formatspptx; pdf
ProvinceCanada; Colombie-Britannique; Alberta; Saskatchewan; Manitoba; Ontario; Québec; Nouveau-Brunswick; Nouvelle-Écosse; Île-du-Prince-Édouard; Terre-Neuve-et-Labrador; Territoires du Nord-Ouest; Yukon; Nunavut
SNRC1; 2; 3; 10; 11; 12; 13; 14; 15; 16; 20; 21; 22; 23; 24; 25; 26; 27; 28; 29; 30; 31; 32; 33; 34; 35; 36; 37; 38; 39; 40; 41; 42; 43; 44; 45; 46; 47; 48; 49; 52; 53; 54; 55; 56; 57; 58; 59; 62; 63; 64; 65; 66; 67; 68; 69; 72; 73; 74; 75; 76; 77; 78; 79; 82; 83; 84; 85; 86; 87; 88; 89; 92; 93; 94; 95; 96; 97; 98; 99; 102; 103; 104; 105; 106; 107; 114O; 114P; 115; 116; 117; 120; 340; 560
Lat/Long OENS-141.0000 -50.0000 90.0000 41.7500
Sujetsetudes de l'environnement; effets sur l'environnement; gisements minéraux; carbonatites; métaux; terres rares; niobium; exploitation minière; résidus; résidus miniers; eau souterraine; eaux de surface; qualité de l'eau; métaux en trace; uranium; thorium; radionucléïdes; radium; plomb; limnologie; analyses géochimiques; analyses spectrométriques; puits d'eau; alcalinité; fluor; oxygène; planification; atténuation; norme relative à l'environnement; gestion de l'environnement; géologie de l'environnement; géologie économique; géochimie; minéralogie; hydrogéologie; Santé et sécurité
Illustrationsphotographs; location maps; aerial photographs; satellite images; graphs; geoscientific sketch maps; profiles; flow diagrams; photomicrographs
ProgrammeGéosciences environnementales, Gestion du programme
Diffusé2017 09 14
Résumé(disponible en anglais seulement)
The extraction and processing of critical metals such as niobium (Nb) and the rare earth elements (REEs) has led to environmental degradation in some parts of the world, but there are few published studies of these environmental impacts and related risks to human health. Recent studies in Quebec by the Geological Survey of Canada (GSC) are providing new geoscience knowledge on the geoenvironmental characteristics of Nb and REE deposits. This knowledge should help to reduce the environmental risks of future development of these important resources.
In FY 2016-2017, GSC scientists collected samples of mine waste, surface water and groundwater at the abandoned St. Lawrence Columbium mine in Oka, Quebec to better understand the distribution, transport, and fate of metals and radionuclides at this former Nb mine. A gamma-ray spectrometer was used to measure the radiation emitted by decay of naturally occurring uranium (U) and thorium (Th) in the mine waste, and a TerraSpec Halo spectrometer was used to identify specific minerals. Seasonal variations in water quality were measured using instruments installed in groundwater wells, data loggers installed in two flooded pits, and water samplers deployed from a Zodiac in July and October 2016 and from the ice surface in February 2017.
Analyses show that mine site surface waters are weakly alkaline and contain low concentrations of fluorine (F), Nb, REEs, U, Th, radium-226, radium-228 and lead-210. The concentrations of these elements are higher in groundwater and in low-oxygen water deeper than 30 m in one of the open pits. This suggests that potentially hazardous elements in the local bedrock and mine waste are relatively immobile in well-oxygenated surface water but may be transported in deeper groundwater. Information from this project will be shared with the Municipality of Oka to help with long-term management of the mine site. The results will also help industry to improve environmental predictions for future Nb- and REE-mines and regulators to develop new environmental guidelines.