The Challenge: Deep-Level Mine Ventilation Overhaul

A major nickel-copper mine in Northern Ontario was facing persistent challenges with its deep-level ventilation system. At depths exceeding 1,200 meters, the existing infrastructure struggled to manage high concentrations of diesel particulate matter (DPM), nitrogen oxides (NOx), and radon gas. Airflow was inconsistent, leading to hazardous pockets of poor air quality and non-compliance with updated Canadian OHS standards for underground air contaminants.

The primary objectives were to design a system that could handle the extreme depth and heat, significantly reduce PM2.5 and DPM levels, and integrate seamlessly with the mine's existing shaft infrastructure without halting production for extended periods.

Our Engineered Solution

Quiventa's approach centered on a multi-stage, modular gas-scrubbing and filtration system, paired with a redesigned airflow network. The solution was not a one-size-fits-all retrofit but a custom-engineered integration.

• Modular High-Efficiency Particulate Air (HEPA) & Chemical Scrubber Units: We deployed compact, stackable filtration modules at key junctions in the ventilation circuit. These units used a combination of electrostatic precipitation and activated carbon chemical scrubbing to target both particulate and gaseous contaminants.
• AI-Driven Airflow Management: A network of sensors was installed to monitor air quality in real-time. This data feeds into a central AI system that dynamically adjusts fan speeds and damper positions to optimize airflow distribution and energy use, eliminating stagnant zones.
• Heat Recovery Ventilation (HRV): To combat the geothermal heat at depth, we incorporated an HRV system that pre-cools incoming fresh air using the exhaust stream, reducing the load on primary cooling systems and improving overall efficiency.

Implementation & Process

The project was executed in three carefully planned phases to minimize operational disruption. Phase 1 involved detailed laser scanning of the existing shafts and drifts to create a precise digital twin for simulation. Phase 2 saw the off-site fabrication and testing of the modular scrubber units. The final phase was a coordinated installation during scheduled maintenance windows over six weeks.

Our on-site team worked closely with the mine's engineering staff, conducting daily briefings and safety audits. The modular design allowed for components to be transported underground in sections and assembled in place, avoiding the need for large-scale excavation or modifications to the mine shaft.

Measurable Results & Impact

The new system's performance exceeded both the client's expectations and regulatory requirements. Post-installation monitoring over a 90-day period provided conclusive data.

• Air Quality: A 94% reduction in average PM2.5 concentrations and an 88% reduction in NOx levels. Radon gas levels were brought well below the regulatory action limit.
• Compliance & Safety: The mine achieved full compliance with Canada's OHS Code Part 5 (Hazardous Substances) and Part 6 (Ventilation). Worker exposure reports related to respiratory irritants dropped by over 70%.
• Operational Efficiency: The AI-driven system reduced overall ventilation energy consumption by an estimated 18%, while the HRV component contributed to a 12% saving in cooling costs.
• System Reliability: The modular design has proven highly reliable, with individual scrubber units capable of being serviced or replaced without shutting down the entire ventilation circuit.