Forum B – Environmental Consequences and Classification of Tailings Dams (½ day)
Date: Sunday, Oct. 15, 2017
, 1 pm – 4:30 pm
CDA’s Environmental Consequence Classification Working Group has been revising guidance for classification of mining dam failure consequence. The group presented an overview of the proposed variables and classification scheme, implementation, scope of effort, and approach to deriving a single classification at the 2016 CDA conference in Halifax.
The 2017 Forum will demonstrate the proposed approach, using two beta-test examples: (1) Kam Kotia, a closed mine located in northeastern Ontario with high-sulfide tailings considered to be the worst abandoned mine site within the Province; and (2) Mount Polley Mine where a subsurface failure beneath the perimeter embankment resulted in tailings release[2,3].
Participants are invited to seek clarification and to provide feedback on the proposed approach, which will help refine the next iteration of the classification guidance.
 C.D. Hamblin and M.G. Kord. The Rehabilitation of Ontario’s Kam Kotia Mine: an Abandoned Acid Generating Tailings Site. http://pdf.library.laurentian.ca/medb/conf/Sudbury03/AbandonedSites/65.pdf
 Morgenstern NR, Vick SG, Van Zyl D (2015) Report on Mount Polley Tailings Storage Facility Breach: Independent Expert Engineering Investigation and Review Panel, Victoria (BC), Canada: Province of British Columbia report.
 Nikl, L, Wernick, B, Van Geest, J, Hughes, C, McMahen, K and Anglin, CD (2016) Mount Polley Mine Embankment Breach: Overview of Aquatic Impacts and Rehabilitation. In: Proceedings Tailings and Mine Waste 2016, Keystone, Colorado, USA. October 2-5, 2016.