Northern Ontario's Biomining Revolution: Transforming Mine Waste into Critical Minerals

In the heart of Sudbury, Ontario, a quiet revolution is underway at Laurentian University's MIRARCO Mining Innovation centre. Researchers are harnessing the power of bacteria to extract valuable critical minerals from decades-old mine tailings, addressing both Canada's urgent need for battery metals and the lingering environmental legacy of hard-rock mining. This bacteria-powered technology, known as bioleaching, promises to turn environmental liabilities into economic assets, positioning Northern Ontario as a leader in sustainable mining innovation.

Sudbury's mining history spans over a century, producing vast quantities of nickel, copper, and other metals essential for modern industry. However, this prosperity came at a cost: massive tailings ponds containing pyrrhotite—a reactive iron sulfide mineral that generates acid and releases heavy metals when exposed to air and water. These sites pose ongoing risks, from dam failures to water contamination. Now, Laurentian scientists are pioneering scalable solutions using naturally occurring microbes to dissolve and recover these hidden treasures.

Sudbury's Mining Legacy and the Tailings Challenge

Sudbury Basin, one of the world's richest mining districts, has generated an estimated 80-100 million tonnes of pyrrhotite-rich tailings bearing 0.8% nickel—potentially $8-10 billion in untapped value. Traditional processing discards pyrrhotite as waste because it's uneconomical to extract low concentrations of nickel, cobalt, and copper. Stored in ponds, these tailings require perpetual management, costing billions annually across Canada.

Laurentian University's researchers, through MIRARCO, are flipping the script. Their work aligns with federal priorities under the Critical Minerals Research, Development and Demonstration program, funded by Natural Resources Canada with $5 million for the new facility. This initiative not only targets Sudbury's waste but also emerging challenges like rare earth elements from other Northern Ontario deposits.

Demystifying Bioleaching: How Bacteria Unlock Minerals

Bioleaching, or biomining, is a hydrometallurgical process where microorganisms—primarily acidophilic bacteria like Acidithiobacillus ferrooxidans—oxidize sulfide minerals. Here's how it works step-by-step:

• Preparation: Tailings are ground and mixed into a slurry with water or nutrient solutions.
• Inoculation: Specialized bacteria are introduced. These extremophiles thrive in acidic conditions, producing sulfuric acid and ferric iron that attack mineral lattices.
• Leaching: In continuous-flow bioreactors, microbes feed on sulfides, releasing metals into solution. For pyrrhotite, this yields high recoveries: up to 98-99% nickel.
• Separation: Pregnant leach solution (PLS) is filtered; metals precipitated via pH adjustment or solvent extraction.
• Waste Neutralization: Leftover solids are detoxified, suitable for backfill or construction.

Unlike energy-intensive roasting or smelting, bioleaching operates at ambient temperatures, slashing energy use by 80-90% and emissions accordingly. For oxide or silicate ores, bacteria produce organic ligands for targeted extraction of lithium or rare earths.Learn more about MIRARCO's biotech approaches.

MIRARCO's State-of-the-Art Pilot Facility

Opened in October 2025, the 10,000-square-foot facility in Azilda, west of Sudbury, marks a milestone for Laurentian University. Previously lab-constrained, researchers now test ton-scale batches in continuous reactors, simulating industrial conditions. Funded by NRCan's $5M grant plus Vale's $875K commitment, it houses genomics labs for real-time microbial monitoring—ensuring optimal consortia for specific wastes.

Capabilities include pre-processing large waste samples, multi-stage leaching, and metal recovery. Genomics tools track bacterial populations, outperforming pH-based controls for reliability. The site, near active mines, facilitates partnerships and de-risks tech transfer.

Spotlight on Laurentian Researchers Driving the Innovation

Dr. Nadia Mykytczuk, MIRARCO's President and CEO, leads with expertise in extremophile genomics. A Northern Ontario Business Award winner, she emphasizes scaling: "We need larger spaces to get technologies into industry hands."

Senior scientist Emmanuel Ngoma oversees reactor ops: "We recover 98-99% nickel continuously—ready for bigger systems." Zach Diloreto, research associate, cultures mineral-specific microbes, exploring REE bioleaching from spodumene.

Recent collaborator Dr. Vasu Appanna, Laurentian biochemist, heads gallium tests for Volta Metals, achieving 75% recovery—vital for semiconductors. These faculty mentor students in biotech-mining interdisciplinary programs.

Pyrrhotite Tailings: BacTech and Vale's Zero-Waste Push

Sudbury's pyrrhotite tailings are priority one. BacTech Environmental's BACOX® process, piloted here, oxidizes sulfides to recover Ni, Co, Cu while neutralizing acidity. Their patent-pending Zero Tailings™ flowsheet valorizes iron as pigment, eliminating ponds.

Vale, Sudbury's major producer, funds tests. Genomics optimize mixed cultures, targeting 30 global bioleach sites' lessons for Canadian firsts. Benefits: $10B recovery, reduced liabilities.

Gallium and REEs: Volta Metals' Cutting-Edge Tests

February 2026 saw Volta Metals launch lab-scale bioleaching at Laurentian's Biomine lab on their Sturgeon Falls (Springer) deposit. Dr. Appanna's team hit 75% gallium and 56-100% REE recoveries using non-invasive reagents—key for chips amid supply crunches.Volta's study details.

This expands bioleaching beyond sulfides, eyeing Northern Ontario's REE potential.

Environmental Remediation and Economic Wins

Bioleaching detoxifies tailings, preventing acid mine drainage (AMD)—a $5B+ Canadian issue. Repurposed solids cut dam needs; metals fuel EVs, reducing virgin mining.

• Energy savings: Ambient vs. 1000°C smelting.
• Water use: Closed-loop recycling.
• Jobs: Biotech skilled roles in mining regions.

Sudbury's $8-10B prize could revitalize economy, create HQP via Laurentian training.

Indigenous Partnerships and Community Impact

MIRARCO's MOU with Wahnapitae First Nation's Taighwenini Technical Services Corp. (TTSC) commercializes tech, trains youth in microbiology and process control. Joint projects reclaim legacy sites, sharing revenues—model for reconciliation in resource sectors.

Laurentian integrates Indigenous knowledge, fostering inclusive innovation.

Higher Education's Role: Training Tomorrow's Biomining Experts

Laurentian's Goodman School of Mines and biotech programs produce graduates for this nexus. The facility offers hands-on PhD/Postdoc training, attracting global talent. Alumna like Mykytczuk exemplify career paths from lab to leadership.

Canada's 64% postsecondary attainment milestone amplifies such hubs.Canada's postsecondary trends.

Scaling Up: Path to Commercialization and Global Leadership

Next: 48,000 sq ft Centre for Mine Waste Biotechnology ($38M, groundbreaking 2026). Full-scale ops in 2-3 years, per Mykytczuk. Pilots prove economics; industry adoption imminent.

Canada lags ~30 global sites but Sudbury's ecosystem—Vale, Glencore, startups—positions it frontrunner. Aligns with federal strategy for critical minerals security.

Photo by Brett Jordan on Unsplash

Broader Implications for Canadian Research and Innovation

This breakthrough elevates Laurentian as biotech-mining hub, inspiring programs nationwide. From Nunavut REEs to Alberta shales, bioleaching diversifies supply chains. For higher ed, it underscores interdisciplinary research's value—blending microbio, geology, engineering.

As demand surges for net-zero tech, Northern Ontario's bacteria could power Canada's green future, training next-gen researchers along the way.