Optimized mine sequencing and deposition phasing for integrated mine closure planning (Okane Archive)

Removing Closure Liability Through Optimized MRS Construction

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Background

Okane’s integrated mine closure planning approach was implemented in a focused study that considered construction methodology and final landform design of two mine rock stockpiles (MRS), which indicated the potential for significant acid treatment costs as the mine progressed, possibly extending beyond the extractive life of mine (LOM).

Approach

A practical solution was developed to significantly reduce the potential for acid generation through progressive closure techniques and reduced lift heights for the operational stockpiles. These solutions were fully modelled and costed using a best-in-class mine planning package that could be fully integrated with the site’s LOM plan. The result was a practical, executable solution and an associated work plan aligning with the existing life of mine strategy.

Client Benefit

The proposed changes in the construction method for the stockpile led to quantifiable increases to the mine’s near-term operating costs. However, these costs were outweighed by the significant reduction in long-term water treatment costs that would have otherwise been realized.

Optimized mine sequencing and deposition phasing for integrated mine closure planning [Digital Image]. Okane Archives.

The net result of this study was proof that progressive reclamation is a real, tangible, and financially viable method of reducing both closure risk, cost, and associated liability for operating mines.