Environmental geoscience investigations surrounding the former Aldermac mine, Abitibi, Quebec : interpreting geochemical records of metal contamination in nearshore lake sediments 30 and 70 years after...: M183-2/8393E-PDF

"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, page iii.

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