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TitleMineralogy and spectral reflectance of soils and tailings from historical gold mines, Nova Scotia
AuthorPercival, J B; White, H P; Goodwin, T A; Parsons, M B; Smith, P K
SourceGeochemistry: Exploration, Environment, Analysis 2013., https://doi.org/10.1144/geochem2011-071
Year2013
Alt SeriesEarth Sciences Sector, Contribution Series 20100499
PublisherThe Geological Society of London
Documentserial
Lang.English
Mediaon-line; digital
File formatpdf
ProvinceNova Scotia
NTS11F/04
AreaGoldboro; Isaacs Harbour; Seal Harbour; Seal Harbour Lake; Gold Brook Lake
Lat/Long WENS -62.0000 -61.5000 45.2500 45.0000
Subjectsmineralogy; environmental geology; tailings; gold; arsenic; infrared spectral analyses; mineralogical analyses; scanning electron microscope analyses; x-ray diffraction analyses; mines; mercury geochemistry; soil geochemistry; tills; Meguma Supergroup; spectral reflectance; Cambrian; Ordovician
Illustrationsphotomicrographs
ProgramEcosystems Risk Characterization, Environmental Geoscience
ProgramTools for environmental impacts and adaptation for metal mining, Environmental Geoscience
AbstractGold 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.
GEOSCAN ID288128