A new wave of innovation is reshaping how the mining industry approaches waste. CBC News, Canada, reported that researchers in Sudbury, northern Ontario, are developing a bacteria-based technology called bioleaching, which uses naturally occurring microbes to extract valuable metals such as nickel, cobalt, and copper from old mine tailings.
Led by MIRARCO Mining Innovation, the team recently opened a pilot facility in October 2025 to scale up this process, aiming to transform mining waste into a source of critical minerals while cutting emissions, reducing environmental risks, and unlocking billions of dollars in untapped resources.
Sudbury Moves Toward Commercial Bioleaching
Sudbury has a long history of mining, leaving behind massive piles of tailings—the leftover rock and sediment from ore extraction. These materials still hold billions of dollars’ worth of metals, but until now, recovering them was difficult, energy-intensive, and expensive. The bioleaching technology changes that. By using bacteria that naturally digest minerals, scientists can release metals from waste rock without relying on harsh chemicals or high temperatures.
According to Nadia Mykytczuk, CEO of MIRARCO, the new pilot facility represents a shift toward sustainable mining. She precisely mentioned that,
In Sudbury alone, the tailings contain $8 billion to $10 billion worth of nickel. With this facility, we are shaping a new era of mining innovation—one that focuses on clean technology, critical minerals, and preparing the workforce of tomorrow.
The facility connects research, industry, and community partners, creating a hub for applied research in bioleaching and bioprocessing.
Before moving to the new facility, MIRARCO operated within Laurentian University, and the long-standing partnership continues. The pilot center allows researchers to handle larger samples of mine waste and test how bioleaching works at a scale closer to industrial operations. This is essential for proving that the process can be commercially viable in Canada.
Bioleaching Breakthrough: Turning Tailings into Critical Minerals
- The process starts by grinding the mine tailings and mixing them with a nutrient-rich liquid. Scientists then introduce specialized bacteria into the mixture.
- These microbes feed on the minerals, producing chemical reactions that dissolve metals into the liquid.
- The resulting slurry moves through a series of reactors, where the process continues, and metals are eventually collected in a liquid form.
Early experiments are promising. Scientists at MIRARCO have noted that the process can recover 98–99 percent of nickel from the tested tailings. The value surpasses traditional methods that often leave large amounts of valuable minerals behind.
In separate research, scientists are growing and refining the bacteria. Different microbes target specific minerals. Some thrive in acidic conditions, ideal for breaking down sulfide tailings, while others focus on iron oxides or silicate rocks.
This flexibility allows scientists to extract not only common metals like nickel and copper but also rare earth elements and lithium, which are critical for batteries and renewable energy technology.
Environmental and Carbon Benefits
Traditional metal extraction uses energy-intensive methods, including high-temperature processing, chemical treatments, and heavy machinery. This approach produces substantial carbon emissions and generates more waste. Bioleaching operates at ambient temperature and pressure, reducing energy use by an estimated 30–40 percent.
It also tackles the challenge of storing mining waste. Canada produces around 650 million tons of mine tailings every year. Much of this material sits in ponds behind dams, which can be unstable and pose long-term environmental risks.
Significantly, tailings may generate acid or release metals into the environment, and dam failures can have serious consequences. The 2014 Mount Polley mine tailings dam failure incident in British Columbia is a stark reminder of these dangers.
By turning tailings into a source of metals, bioleaching reduces the volume of waste requiring storage, cutting both environmental risk and the legacy costs of old mining sites.
Overcoming Challenges
While promising, the technology is not without hurdles. Processing tailings can be costly, and the bacteria require careful monitoring and specific growth conditions. Scaling up from pilot operations to full commercial production will also need investment in infrastructure and specialized equipment.
Environmental experts, such as MiningWatch Canada, note that tailings can behave unpredictably. They may chemically react over time or shift physically, posing stability concerns. Effective containment and monitoring are critical to ensure the process remains safe at larger scales.
Despite these challenges, researchers are optimistic. Early pilot studies indicate that the bacterial method could recover 65–80 percent of minerals left behind by conventional processing. This is a significant improvement that makes further investment worthwhile.
Fueling Canada’s Clean Energy Future
The technology comes at a crucial time. Global demand for critical minerals is rising as electric vehicles, wind turbines, and solar panels become more widespread. Canada has identified 31 minerals essential for the energy transition, but many are currently imported from regions with supply risks. Bioleaching offers a way to unlock domestic resources while reducing dependence on imports.
The process could provide materials for electric vehicle batteries, grid infrastructure, and industrial applications. Lithium and cobalt can power EVs, rare earth elements like neodymium and dysprosium support wind turbines and other clean energy systems, and copper and nickel are essential for electrical grids.
By recovering these from tailings, Canada could strengthen its supply chains while reducing environmental impact.
By 2040, the IEA expects the value of North America’s energy minerals to grow to around USD 30 billion for mining and USD 14 billion for refining. Mining growth will mainly come from copper in the United States and Mexico, and from lithium and nickel in Canada.
For refining, the region could make up about 4% of the global market, led by copper and lithium refining in the United States and copper and nickel refining in Canada.
Moving Toward Commercial Deployment
MIRARCO aims to transition from pilot testing to full-scale operations in the next two to three years. Globally, bioleaching is already in use at around 30 mining sites, but Canada has yet to deploy it commercially. The pilot facility in Sudbury is helping bridge that gap by testing continuous processing and demonstrating commercial viability.
Government support is also playing a key role. CBC further highlighted that funding through Canada’s Clean Technology Program and provincial innovation grants is helping advance research and development. The technology aligns with national goals to position Canada as a global leader in sustainable critical minerals production by 2030.
Overall, industry analysts predict bioextraction could become commercially viable within three to five years for specific minerals, with broader adoption following as operational experience grows.
