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EVALUATING PERFORMANCE OF COVER DESIGN FOR REMEDIAL OPTIONS ANALYSIS OF MINE CLOSURE, CANTUNG MINE, NWT
Kingston, S. and A. Hudson.
2018 Northern Latitudes Mining Reclamation Workshop, September 10-13, Whitehorse and Carcross, Yukon. 32 slides, 2018

The Cantung Mine site is located near the headwaters of the Flat River, ~300 km north of Watson Lake, just east of the Yukon border in the Northwest Territories (NWT). Tailings at the Cantung mine site are consistently classified as potentially acid generating with elevated metals content and are located in close proximity to the Flat River channel. All of the containment dams for the five tailings ponds are constructed of local glacial till and alluvial materials consisting of a mixture of silts, sands, and gravels, with occasional cobbles and boulders. The 1-3 m of glacial till cover over tailings ponds 1 and 2 (TP1/2) has been in place for ~40 years. The cover appears to prevent acid generation onset effectively, but the mechanism by which the cover is working is not well understood. Predictive geochemical modeling, cover design investigation, infiltration and seepage modeling, and oxygen ingress modeling has been completed as part of a remedial options analysis to evaluate the effectiveness of the TP1/2 cover. The goal is to provide an analog for use in closing the currently uncovered TP3/4/5. Silicate minerals in the cover might be the controlling factor in reactions taking place in the cover.
Slides: https://www.yukonminers.org/index.php/presentations/54-kingston-scott-evaluating-performance-of-cover-design-cantung/file
Longer abstract: https://www.yukonminers.org/index.php/abstracts-and-biographies/30-kingston-scott/file



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