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Stability Assesment Underway for New Use of Open Pit Mine

Northwestern Spain, Europe


Client Orvana Minerals of Canada
Industries Mining
Services Geotechnical Engineering, Groundwater/Hydrogeology, Surface Water/Sediments, Tailings Management, – soil and rock mechanics, soil rock and mining engineering

Assignment
Production at the El Valle-Boinas mining site, within the Rio Narcea Gold Belt, had largely been done by open pit methods prior to switching to underground in 2004. The original tailings storage facility (TSF) had also been closed. <

When Orvana Minerals acquired the mine in 2009, the intent was to develop the underground deposit adjacent to the closed pits. To minimise environmental impact, the closed El Valle pit was proposed for permanent storage of the waste (tailings) from the plant processing the ore from the new underground works. Two significant slope failures had already occurred post-closure, along with extensive erosion of the lower slopes. As part of the permitting process, regulators required that the stability of the pit slopes be assessed and remedial measures be implemented to ensure the TSF operates safely.

Our Role
A multidisciplinary Golder team from Spain, UK, France and Ireland have investigated geotechnical and hydrogeological conditions. Their work has resulted in an updated geotechnical model and design assessment to attain the necessary safety factor on the pit walls. The solution was to cut back the slope angle of the pit wall, along with improving the management of surface water and installing discrete slope support measures.

Associated Services

Geotechnical Engineering—Soil and Rock Mechanics/Soil, Rock, and Mining Engineering
Providing solutions to our clients’ ground engineering challenges around the world for 50 years – our team brings a wealth of...

Groundwater/Hydrogeology
Golder has one of the largest groups of water resources and contaminant hydrogeologists in the world; we have been solving the most...

Surface Water/Sediments
Our engineers and scientists use state-of-the-art tools and techniques to find solutions to hydrologic, hydraulic and water management...

Tailings Management
On a daily basis, Golder Associates works on mines around the world to design, build, operate or close mine waste management facilities,...

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