Innovative Suboxic Design for a Mined Rock Stockpile (MRS)

Okane led the modelling, design, and performance monitoring of a mine rock stockpile (MRS) for suboxic conditions. The goal was to improve source term control and water quality concerning selenium, sulfate, nitrate, and other contaminants of interest (COIs).

Okane’s approach integrated modelling, design, and performance monitoring in an iterative process to produce an oxygen-limiting landform design (i.e., suboxic design). Significant enhancements and model development created a fully integrated model connecting hydrology, oxygen conditions, material properties, MRS structure, and climate to predict final seepage water quality. As mining progresses, the design and construction of suboxic landforms for COI management will continue, demonstrating true adaptive management for the site.

Source term control of COIs in an MRS is an innovative practice, showcasing a significant commitment to minimizing water quality impact in the region for both regulators and stakeholders. It is considered a proactive approach compared to constructing water treatment plants or passively treating water as water quality issues arose. This approach also reduces the risk of poor water quality and associated closure treatment costs.