British Columbian taxpayers footed the bill for the report on Mount Polley Investigation on the Tailings Pond Breach
Executive Summary (Page 3 of 642)
New Gold completed this Tailings Alternative Assessment (TAA) for the Blackwater Gold Project (Project) in response to a request from the British Columbia (BC) Environment Assessment Office (EAO; March 19, 2015) that ALL MININGS PROPONENTS consider the implentation of Best Available Technology (BAT) and Best Available Practices (BAP) identified by the Mount Polley Independent Investigation Review Panel (the Panel).
In a letter dated June 3, 2015, the Canadian Environmental Assessment Agency requested that environmental effects, as defined in section 5 of the Canadian Environmental Assessment Act, 2012, be included as factors to be considered in the assessment of the preferred option.
• Step 1 – Identified initial candidate alternatives utilizing three tailings management technologies (thickened slurry, paste, and filtered ‘dry stack’ over a wide area of potential sites (23 candidates identified).
• Step 2 – Conducted a pre-screening assessment (fatal-flaw analysis) to eliminate any candidate that did not meet certain minimum criteria for the Project (10 candidates eliminated; 13 remained).
• Step 3 – Conducted a high level risk assessment (HLRA) to identify the lowest risk candidates for each of the tailings technologies, and eliminate the higher risk candidates from further consideration.
• Step 4 – Conducted a multiple accounts analysis (MAA) to identify BAT for the Blackwater Project (3 candidates eliminated; 1 selected candidate).
• Step 5 – Assessed the selected BAT candidate using a Failure Modes Effects Assessment (FMEA) to determine BAP including additional practices beyond those described in the Application/EIS that could further improve the physical safety of the impoundment.
• Step 6 – assessment of the impacts to Aboriginal rights and interests.
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Google Search: Mount Polley BAT BAP
The University of Western Australia
BAT or BAP? A review of some dramatic changes in tailings management in the recent past and potential changes in the future 43 Pages
Andy Fourie School of Civil, Environmental & Mining Engineering
Mount Polley, British Columbia, Canada
Itabirito, Minas Gerais, Brazil tailings pond
Cananea, Sonora, Mexico Tailings Pond
Dan River Steam Station Tailings Pond
Contrast 'conventional' tailings with thicker tailings
Provide examples; what worked, what perhaps did not work so well
The use of filtered tailings