This session will explore the challenges associated with the reclamation of mining sites that began operations at a time when the design criteria did not meet current environmental standards. It will also examine the problems related to the lack of historical information and aging infrastructure. Using case studies, the focus will be on integrating innovative strategies to reconcile the constraints inherited from the past with the current regulatory requirements.
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Mines
Mine reclamation of older sites: Today’s Requirements
Tuesday, November 17, 2026
9:30 a.m.
Welcome Address
Conference details
Historical mining sites constitute an industrial, environmental and territorial legacy whose reclamation requires approaches tailored to their long history. Designed and operated at a time when standards, waste management practices and stakeholder expectations differed significantly from current requirements, these sites present unique challenges. Reclamation therefore requires understanding, documenting and managing a complex legacy.
This presentation will draw on the example of Matagami, in Québec, to examine the issues associated with the closure and reclamation of a historical mining site. The analysis will focus in particular on reconstructing operational history, managing documentary gaps, evaluating residual risks and addressing aging infrastructure whose design may not meet current standards.
The presentation will also address the evolution of regulatory frameworks and environmental expectations, which can alter closure criteria over a site’s lifespan. These changes can increase uncertainty regarding closure plans, the scope of work, costs, financial guarantees, schedules and long-term monitoring obligations. They thus raise a central question for investment planning: how to manage the financial and technical risk associated with shifting government targets and standards?
Through the case of Matagami, emphasis will be placed on an integrated approach based on adaptive management, technological innovation, progressive site knowledge and dialogue with authorities and communities.