Innovative Erosion Solutions: Concrete Canvas® GCCM* at Work in Eagle Gold Mine

In May 2019, Concrete Canvas® (CC) GCCM* was installed as an erosion control Iiner for two spillways. The firstconnects 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%

The onsite contractor, JDS Energy and Mining Inc installed the material at a rate of 750 – 850m² per day in temperatures of 15°C. BCG valued the hydraulic design advice provided by Concrete Canvas Ltd and the client is satisfied that the spillways were installed to meet the program