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Industry
Civil Infrastructure
Challenge:
In May 2019, Eagle Gold Mine needed a reliable erosion control solution for two spillways in a remote, highly regulated northern Yukon site, where extreme seasonal temperatures and logistical constraints made traditional concreting methods impractical.
Achievement:
Concrete Canvas® was installed across 140 meters of steep emergency spillway and 500 meters of main spillway at Eagle Gold Mine, achieving rapid daily installation rates of up to 850m² in challenging northern Yukon conditions, while meeting stringent engineering specifications and regulatory standards.
Product Used:
Concrete Canvas®
Location: Eagle Gold Mine, Yukon, Canada
Project Type: Product Supply & Installation
Product Used: Concrete Canvas® CC8™ CC13™ Bulk Rolls
Project
In May 2019, Concrete Canvas® (CC) GCCM* was installed as an erosion control liner for two spillways. The first connects the heap leach pad to an events pond and the second, an emergency spillway for the events pond.
The spillways formed part of the Eagle Gold Mine operated by Victoria Gold, located in northern Yukon, approximately 200km from the Alaskan Border.The local area is subjected to seasonal variance of 20° to -30°C.
Alternatives to Concrete Canvas that were considered included poured concrete with an applied coating. This was discounted due to concerns about the logistical requirements and installation rates.
The spillways were designed to convey any overtopped heap leachate in the case of extreme weather events. The spillway would only likely experience any flow in the case of a 200-year storm event. The site is heavily monitored by the Canadian mining regulator and Ministry of Mining.
The main spillway is approximately 500m in length with profile sections of 5-8m at 7-15%. CC8™ was used for fall sections of 7.5% and CC13™ was used where the fall of the section increased to 15%.
Concrete Canvas® (CC) is a Geosynthetic Cementitious Composite Mat (GCCM), a factory-produced material combining cement within geosynthetic layers that hardens when hydrated for erosion control and weed suppression.
Summary
The emergency spillway is approximately 140m in length of varying width at 50% gradient and lined exclusively with CC13™ as per the specification of the engineering consultant, BGC Engineering.
The main spillway was installed as per standard CC channel lining detail; hydrated overlaps, Soudal 250XF bead, SS screws at 200mm centers, 100-150mm overlap with a 1.3m anchor trench (0.75 x 3) along either crest with ground pins. It was calculated that the main spillway did not require intermediate fixings.
The emergency spillway had Gripple rock anchors at fixings of no less than 1.8m centers along it’s main section. At the 90° corner, anchor centers were no less than 0.5m apart.
The onsite contractor, JDS Energy along withMining Inc and Titan Environmental installed the material at arate of 750 – 850m² per day in temperatures of 15°C. The area can reach lows of -30° in winter.
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