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TitleEnvironmental geoscience investigations surrounding the former Aldermac mine, Abitibi, Quebec: interpreting geochemical records of metal contamination in near-shore lake sediments 30 and 70 years after mining
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AuthorAlpay, S; McNeil, R J; Hinton, M J; Grenier, A
SourceGeological Survey of Canada, Open File 8393, 2019, 43 pages, https://doi.org/10.4095/315351 (Open Access)
Year2019
PublisherNatural Resources Canada
Documentopen file
Lang.English
Mediaon-line; digital
RelatedThis publication is related to the following publications
File formatreadme
File formatpdf (Adobe® Reader®); rtf; xlsx (Microsoft® Excel®); docx (Microsoft® Word®)
ProvinceQuebec
NTS32D/03; 32D/06
AreaRouyn-Noranda; Lac Dasserat; Lac Arnoux; Lac Desvaux; Lac Berthemet; Rivière Kanasula; Rivière Arnoux
Lat/Long WENS -79.5000 -79.2250 48.3167 48.1667
Subjectsenvironmental geology; geochemistry; hydrogeology; Nature and Environment; Science and Technology; environmental analysis; environmental impacts; mining; mines; mine waste products; acid mine drainage; lake sediment geochemistry; lake sediment cores; pollutants; metals; core samples; grab samples; bulk samples; geochemical analyses; organic carbon; mass spectrometer analysis; colorimetric analyses; sampling techniques; sample preparation; Aldermac Mine; Abitibi Greenstone Belt; environmental impact assessment; anthropogenic sources; lacustrine nearshore sediments; contaminated sites; datasets; archived samples; re-sampling; loss-on-ignition (LOI)
Illustrationslocation maps; photographs; schematic diagrams; tables; geoscientific sketch maps; geochemical plots; bar graphs
ProgramMetal Mining: northern baselines, Environmental Geoscience
Released2019 10 03
Abstract(Summary)
This Geological Survey of Canada (GSC) Open File report presents geochemical datasets from near-shore lake sediments, collected in 1971-72 and 2012, located downstream of the abandoned Aldermac metal mine (Cu-Zn-Ag-Au), 25 km west of Rouyn-Noranda, Quebec. A subset of 25 lake sediment samples, retrieved during a large-scale survey in 1971-72, overlaps geographically with recent investigations of the environmental consequences of metal mining. The archived samples were re-analysed by modern analytical methods. In 2012, these sampling stations were revisited to collect recent sediments, analysed by the same analytical methods. This study evaluates elemental concentrations and their spatial distributions in 1971-72 and 40 years later. Evidence of acid mine drainage persists seven decades after mining operations ended. Although bulk sediment geochemical data can provide qualitative insights into regional distributions for reconnaissance, cautions are advisable when comparing quantitative data from different times, using different sampling techniques, sample treatments, and analytical methods.
Summary(Plain Language Summary, not published)
This Geological Survey of Canada (GSC) Open File report presents comparative geochemical datasets of bulk near-shore lake sediments, collected in 1972 and re-sampled in 2013. A subset of 25 samples, retrieved during a large-scale GSC survey in 1971-72, overlaps geographically with recent investigations of the environmental consequences of historical metal mining in the Lac Dasserat study. Sediment samples from the 1971-72 survey were retrieved from GSC archives and re-analysed by ICP-MS after both aqua-regia and multi-acid dissolutions. In 2013, the identical 25 sampling stations were revisited to collect recent sediments, which were analysed by the same modern methods, to take advantage of an opportunity to evaluate elemental concentrations and spatial distributions after 41 years. The sites are located in the drainage basin downstream of the abandoned Aldermac metal mine near Rouyn-Noranda, Quebec.
GEOSCAN ID315351