Reclaiming Value by Identifying Risks

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Background

A gold mine located in Ontario consistently produces 250,000 ounces of gold annually, significantly contributing to the local economy. In addition to its valuable output, the mine will also produce low-value rock for storage in mine rock storage areas (MRSAs). While MRSAs may pose certain environmental risks, Okane was engaged by the client as a proactive approach to mitigate these risks.

Approach

Okane developed a reclamation and closure plan guided by a Failure Modes and Effects Analysis (FMEA), resulting in a commitment to conduct cover system and revegetation trials on pilot-scale MRSs. The revegetation trial was designed in collaboration with local Indigenous communities. Four cover system amendments and nine vegetation prescriptions were assessed in a randomized complete block experiment.

Client Benefit

Preliminary results indicate strong survivability of tree seedlings and clear treatment effects for erosion control. The risk-based approach will guide focused studies that contribute directly to closure planning and offer a structured framework to demonstrate alignment with stakeholder expectations.

Revegetation cover trial [Digital Image]. Okane Archives.

A lot of mines talk about what they are going to do in closure without ever proving it will work. We are happy to see this project is proving the concept with input from communities to make sure it will actually work as promised.