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TitreMineralogy and spectral reflectance of soils and tailings from historical gold mines, Nova Scotia
AuteurPercival, J B; White, H P; Goodwin, T A; Parsons, M B; Smith, P K
SourceGeochemistry: Exploration, Environment, Analysis vol. 14, no. 1, 2013 p. 3-16,
Séries alt.Secteur des sciences de la Terre, Contribution externe 20100499
ÉditeurGeological Society of London
Documentpublication en série
Mediaen ligne; numérique
Lat/Long OENS -62.0000 -61.5000 45.2500 45.0000
Sujetsrésidus; or; arsenic; analyses à l'infrarouge; analyses minéralogiques; analyses au microscope électronique à balayage; analyses par diffraction des rayons x; mines; géochimie du mercure; géochimie du sol; tills; Supergroupe de Meguma ; minéralogie; géologie de l'environnement; Cambrien; Ordovicien
ProgrammeEcosystems Risk Characterization, Géosciencess de l'environnement
ProgrammeOutils d'adaptation et d'impacts sur l'environnement pour les mines de métaux, Géosciences environnementales
Diffusé2013 08 22
Résumé(disponible en anglais seulement)
Gold was mined in 64 districts in southern Nova Scotia between 1861 and the early 1940s, followed by limited, intermittent production up to the present. There is extensive dispersion of arsenic- and mercury-bearing mine tailings in the receiving environment downstream from many of these sites. Elevated mercury concentrations, highest near old stamp mill foundations, occur because of the mercury amalgamation process used to extract gold until the 1940s. Arsenic, on the other hand, occurs naturally in arsenopyrite, which is associated with the gold-bearing quartz veins and host rocks. Tailings are composed of fine sand- to silt-sized quartz, feldspar, illite and chlorite, and represent the primary rock-forming minerals in the metasedimentary host rocks of the Cambro-Ordovician Meguma Supergroup. Carbonate and sulphide minerals occur in minor to trace amounts, along with secondary minerals such as scorodite (FeAsO4·2H2O). The extent of tailings dispersal can be mapped through hyperspectral remote sensing methods, as these major mineral components provide an identifiable spectral signature through visible, near infrared and short-wave infrared regions. This paper examines the mineralogy of soils, tills and tailings in the Upper and Lower Seal Harbour gold district of Nova Scotia. Ground truthing of space-borne hyperspectral data demonstrates the potential for remote mapping of the spatial extent of these historical mine wastes.