| Titre | Arsenic speciation in mine tailings and co-existing pore water, Lower Seal Harbour Gold District, Nova Scotia, Canada |
| Auteur | Daniels, C; Parsons, M; Jamieson, H; Hall, G |
| Source | Proceedings of the 9th International Conference on Acid Rock Drainage; 2012 p. 1-12 |
| Année | 2012 |
| Séries alt. | Secteur des sciences de la Terre, Contribution externe 20110327 |
| Réunion | 9th International Conference on Acid Rock Drainage; Ottawa; CA; mai 20 - 26, 2012 |
| Document | livre |
| Lang. | anglais |
| Media | CD-ROM; numérique |
| Formats | pdf |
| Province | Nouvelle-Écosse |
| SNRC | 11F/04 |
| Lat/Long OENS | -62.0000 -61.5000 45.2500 45.0000 |
| Sujets | exploitation minière; or; activités minières; résidus; analyses des résidus; géochimie des résidus; arsenic; géochimie de l'arsenic; arsénopyrite; fluides des pores; géométrie des pores; échantillons
d'eau interstitielle; effets sur l'environnement; etudes de l'environnement; résidus miniers; dangers pour la santé; géologie de l'environnement; géochimie; Paléozoïque; Ordovicien; Cambrien |
| Illustrations | location maps; plots; micrographs |
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| Programme | Gestionnaire de programme, Géoscience de l'environnement |
| Résumé | (disponible en anglais seulement)
Environmental impacts from historical mining and milling of lode gold deposits in Nova Scotia include elevated arsenic (As) concentrations within the tailings
and in downstream receiving environments. The Lower Seal Harbour Gold District (LSH) operated from 1904 to the mid-1940s and produced approximately 395,000 tonnes of tailings. This study examined As speciation in tailings and associated pore waters
to better understand the processes that control the mobility of As from these mine wastes.
Within LSH, three geographically and geochemically distinct sample locations were chosen to collect tailings and pore waters, including (1) sub-aerially
exposed tailings; (2) shallowly submerged tailings; and, (3) tailings that are present in the intertidal zone of Seal Harbour, 2 km downstream of the milling operations at LSH.
Arsenic is present in the tailings at Sites 1, 2 and 3 at maximum
concentrations of 9,200, 12,000 and 1,040 mg/kg, respectively. Elevated concentrations of As corresponded to arsenopyrite-bearing sections of the tailings cores, or intervals with abundant As-bearing secondary phases. Pore water analyses indicate
high concentrations of As and pH values from 6.2 to 8.0.
Results from this study have helped to clarify the environmental risks associated with these historical mine wastes, and will support better informed land-management decisions. |
| GEOSCAN ID | 289702 |
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