U.S. EPA Contaminated Site Cleanup Information (CLU-IN)

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U.S. EPA Technology Innovation and Field Services Division

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Canada's Oil Sands Innovation Alliance, Report No. 1777450, 91 pp, 2017

The use of pit lakes for long-term containment of tailings and mine waste is recognized as best practice by the mine closure community in many jurisdictions and in global guidance documents. Various sectors of the mining industry consider water-capped, in-pit mine waste disposal to be a best practice in terms of geotechnical stability, geochemical stability, and protection of regional aquifers (either by directing contaminated groundwater to the pit or by engineering a preferential pathway around the pit to minimize contact with mine waste). Presented in this report are 12 examples of successful pit lakes (6 of which were used to sequester tailings and/or mine wastes), 16 examples of pit lakes that are being extensively managed toward success (14 of which were used to sequester tailings and/or mine wastes), and 5 unsuccessful pit lakes (all of which were used to sequester tailings and/or mine wastes). https://www.cosia.ca/sites/default/files/attachments/Literature%20Review%20of%20Global%20Pit%20Lakes_0.pdf See also 29 illustrating slides from the 2018 British Columbia MEND Metal Leaching/Acid Rock Drainage Workshop: http://bc-mlard.ca/files/presentations/2018-8-VANDENBERG-MCCULLOUGH-review-pit-lake-case-studies.pdf.

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