Author:
Adu-Wusu Celestina,Yanful Ernest K
Abstract
Three engineered test covers were installed at the Whistle Mine test site, near Capreol, Ontario, and monitored over 4 years. Each cover was a two-layer system consisting of a 0.90 m noncompacted gravelly sand overlying a barrier layer and a 6.10 m waste rock platform. The barriers consisted of a 92% sand – 8% bentonite mixture, a sandy silt, and a geosynthetic clay liner (GCL). A control plot (waste rock without cover) was also monitored. Water percolation through the covers was 61% for the sandy silt cover, 24% for the sand–bentonite mixture, 12% for the GCL, and 58% for the control. Post-monitoring excavation and examination of the test plots indicated that defects in the placement of the barrier layers, coupled with freeze–thaw effects, likely contributed to the unexpected high water percolation values observed. The results suggest that lapses in construction of soil barriers, such as lack of proper installation and quality control, can compromise cover effectiveness.Key words: mine waste, remediation, soil covers, post closure, investigations, water balance.
Publisher
Canadian Science Publishing
Subject
Civil and Structural Engineering,Geotechnical Engineering and Engineering Geology
Cited by
17 articles.
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