Expertise in the Closure of Mining and Metallurgical Facilities

Mine closure Capability statement Expertise in the closure of mining and metallurgical facilities

Closure of a mining or metallurgical facility is a multi-faceted and often complex undertaking that requires a diversified set of expertise. SNC-Lavalin brings together what it takes: the necessary diversified expertise as well as extensive, worldwide experience in the design, implementation, and monitoring of closure plans for facilities of all sizes, including some of the largest of their kind in the world. Our team offers innovative, state of the art, and robust closure solutions to comply with very stringent legislations and to meet society expectations for a more sustainable mining industry. Right from project inception, designing for closure is intrinsic to our approach. We design tailings management facilities and waste rock piles to optimize progressive rehabilitation during the life of mine and to facilitate closure at the end of operations.

Closure planning Closure execution Post closure

›› Setting objectives, planning ›› Progressive rehabilitation ›› Post-closure water management and treatment ›› Studies, designs, cost estimating ›› Closure of tailings management facilities and waste rock piles ›› Post-closure performance monitoring ›› Liner and cover design (groundwater, surface water, ›› Liner and cover installation ›› Design of water treatment plants geotechnical, subsidence, vegetation) ›› Infrastructure decommissioning ›› Identification and analysis of alternative end uses ›› Soil decontamination ›› Slope stability analysis ›› Environmental inspections ›› Permitting ›› Management of demolition debris ›› Stakeholder engagement ›› Rehabilitation and revegetation programs IN THE LAST 10 YEARS ALONE, SNC-LAVALIN HAS PREPARED AND / OR IMPLEMENTED OVER mine closure plans 25AROUND THE WORLD Recent selected projects Reclamation of Aldermac Orphan Mine Site, Canada

Client: Ministry of Natural Resources and Wildlife of Quebec Highlights of services provided Services: SS, FS, EPCM ›› Final closure concept involved excavation of large spill areas, ›› Reclamation of a former Cu-Zn mine which had discharged installation of an impervious cover over a large tailings mound, ~1.5 Mt of acid-generating mine tailings over 76 hectares, from and construction / raising of dams with granular cover to create an 1932 to 1943. Surrounding rivers and lakes over 10 km downstream elevated water table over the remaining tailings of the site were contaminated by metal leaching from tailings ›› Used state-of-the-art ecological engineering practices for revegetation, ›› SNC-Lavalin was present at all stages of the project, from including creation of natural habitats such as small ponds and wetlands conceptual and detailed engineering to construction management ›› Achieved successful reclamation of a major environmental liability and supervision. that had impacted surrounding watercourses over decades. Conceptual Closure Plans of 4 Large Copper Mining / Smelting Complexes, Chile

Client: Corporación Nacional del Cobre de Chile (Codelco) Highlights of services provided Services: CS ›› The four plans were prepared in 13-months, an outstanding ›› Preparation of conceptual closure plans for three of achievement considering the size of these operations the world’s largest copper mines (El Teniente, Andina, ›› Closure plans were rapidly approved by the regulatory body Chuquicamata / Radomiro Tomic) and the Ventanas copper (SERNAGEOMIN) without major observations smelter. These closure plans were the very first ever prepared for these operations following the enactment of a new ›› Codelco expressed its high satisfaction: “… the final product of this regulation on mine closure in Chile in 2007 study is truly a benchmark within Codelco, and particularly at the El Teniente Division, thanks to the high quality of professionals who ›› Key challenge: numerous and diverse environmental issues participated in its execution and to the team work we could achieve related to facilities that had operated for over a century together with SNC-Lavalin, a factor we consider was the key to meet (El Teniente and Chuquicamata). successfully this atypical challenge”. Reclamation of the Normétal Mine Site, Canada

Client: Xstrata Zinc Highlights of services provided Services: EPCM ›› Project was awarded the 2009 SNC-Lavalin Award of Excellence ›› Reclamation of a former Cu-Zn mine site, including a mill, for Outstanding Achievement in Environment underground mine, and 3 tailings ponds, that had operated ›› Implemented an innovative rehabilitation program isolating acid- for 40 years generating tailings from oxygen to prevent further contamination ›› Rehabilitation included profiling of tailings impoundments, of surface run-off installation of an impervious cover over mining residues ›› Eliminated a major environmental and public health risk for local to prevent water infiltration, and revegetation communities that had been exposed to reactive tailings dust for ›› Mandate was executed over 3 years, followed by a 5 year many years. monitoring program.

Year Country Project Client Services

2018* Canada Poirier Mine Closed Site Long-Term Maintenance Standard BHP Billiton Study

2017 Canada Caber Mine Closure Plan Glencore - Matagami Mine CS

2016 Canada Consolidation of the Vaudreuil Alumina Plant Closure Costs Rio Tinto Aluminum PFS

2015 Canada Management of the Meadowbank Mine Closure Study Agnico Eagle Mines PFS

2013 Burkina Faso Update of the Mana Mine Closure Plan SEMAFO PFS

2012 Dominican Rep. Conceptual Closure Plan Xstrata Nickel SS

2012 Canada Reclamation of Aldermac Orphan Mine Site Ministry of Natural Resources of Quebec SS, FS, EPCM

2012 Canada Bracemac-Mcleod Mine Closure Plan Xstrata Zinc PFS

2011 New Caledonia Conceptual Closure of the Goro Nickel Pilot Plant Vale New Caledonia SS

2011 Canada Blind River Refinery Preliminary Decommissioning Plan Update Cameco PFS

2009 Chile Conceptual Closure Plans of El Teniente, Andina & Chuquicamata/R Tomic Mines & Ventanas Smelter Codelco CS x 4

2008 Canada Gaspé Mine Reclamation Closure Plan and Phase 1 Xstrata Copper FS, EPCM

2008 Canada Final implementation of the Heath Steele Mine Closure Plan Xstrata Zinc EPCM

CS: Conceptual Study / SS: Scoping Study / PFS: Pre-feasibility Study / E: Engineering / P: Procurement / CM: Construction Management * Estimated completion date