Summary

• The Ontario government intended to move radioactive waste from the shore of Lake Nipissing to a former mine site outside Sudbury, Ont.
• A lack of consultation around the new location led to strong local opposition, and delayed the remediation project conducted by Nipissing First Nation.
• The waste has now been moved to a disposal site outside Sarnia, Ont., and Aamjiwnaang First Nation, where emissions from the industrial area known as Chemical Valley have affected local air quality.

For decades, radioactive waste sat near the shore of Lake Nipissing. It looked like an innocuous pile of gravel in what was otherwise a stretch of forest. People began using it to backfill lots, fill spaces under decks and build fire pits. In the 1970s and ’80s, Nipissing First Nation began using it to build roads. 

It wasn’t normal gravel, though. It was mine tailings, containing the metal niobium, left there when the Nova Beaucage mine shuttered in 1956 after just seven months of operation. 

“The company just walked away and left it with no remediation at all,” Geneviève Couchie, business operations manager at Nipissing First Nation, said. Couchie led a project to clean up the tailings, which first started in 2019. After being interrupted by COVID-19 shutdowns, the remediation resumed in spring 2024 and lasted almost two years.

In the meantime, Couchie told The Narwhal, she fielded concerns about groundwater and lake contamination from residents living close to the site or to a nearby property owned by Ontario’s Ministry of Transportation that also stored the low-level radioactive tailings. Couchie said she struggled to get satisfactory answers from government agencies.

“The workers wore hazmat suits, and I remember saying from the beginning, ‘How can I tell people they have nothing to worry about when these guys are in full on suits?’ They’re literally 20 feet from someone’s window,” Couchie said. The majority of the workers remediating the site were from the nation, and dressed in protective gear so as not to carry radioactive dust home on their clothes. 

“We just wanted to see this material moved off [Nipissing First Nation] lands,” Geneviève Couchie, business operations manager at Nipissing First Nation, said. But the remediation was first interrupted by the COVID-19 pandemic and then by the Ontario government’s attempt to relocate the waste without consulting the community meant to receive it. Photos: Supplied by Nipissing First Nation.

The plan was to load the waste into trucks to be transported to a tailings management area at Agnew Lake, in Sudbury District. It is the decommissioned site of a former mine, near the Township of Nairn and Hyman, and about 150 kilometres from Nipissing First Nation. The nation first had to excavate nearly 50,000 metric tonnes of the radioactive material — enough to build the Statue of Liberty, twice.

But the project faced another unexpected delay. The province had attempted to relocate the waste without consulting the Nairn community, sparking public outcry. Locals organized public meetings to raise awareness and ultimately stop the transfer. 

Eventually, in July 2025 — after nearly a year of advocacy in Nairn, and delay for Nipissing First Nation — the province capitulated, finding another place for the waste to go. This was welcome news for Nipissing First Nation, which is now hoping to transform the scarred land into a lakeside green space for the community to enjoy after years of worry.

“We just wanted to see this material moved off [Nipissing First Nation] lands, and so it was an unexpected disappointment that things were delayed like they were,” Couchie said. “We were pleased that they did end up finding another disposal site.”

“But,” Couchie said, it was “eye opening as well, that there was only one other facility in Ontario that was prepared to accept this.”

That facility is close to another Indigenous community — Aamjiwnaang First Nation, in the Sarnia region, where emissions from refineries and petrochemical plants have earned the area the moniker “Chemical Valley.” 

Sarnia facility accepting radioactive waste from Nipissing

The new destination for the radioactive tailings is Clean Harbors, a hazardous waste facility in Corunna, Ont. — 645 kilometres from its original dumping ground. It’s close to both Aamjiwnaang and Sarnia, which have experienced persistent air quality issues related to nearby industry.

Clean Harbors is the only government-licensed hazardous waste management complex in Ontario, and is “uniquely positioned,” its website reads, to offer safe disposal of naturally occurring radioactive material like the niobium tailings. 

But the facility’s history is dotted with dust-ups over environmental safety. In 2013, neighbours of the Clean Harbors site won a civil lawsuit over the impact of the waste facility’s emissions on their health and daily lives.

In 2019 the company was fined $100,000 for discharging contaminated smoke after a filter cloth soaked with coolant, oils and metal particles caught fire.

When the province conducted a study on environmental stressors in the Sarnia area in 2023, it found that while the majority of the 870 reports from residents about industrial pollution were related to petrochemical industries and refineries, a significant minority — 219 — were “related to the waste incineration facility in the area (Clean Harbors).”

And in 2025, the Ministry of Environment fined Clean Harbors $100,000 for failing to comply with an equipment requirement for monitoring the excavation of a waste-holding basin. 

Clean Harbors did not respond to The Narwhal’s questions about these claims and findings.

In a section of their 2025 annual report on legal, environmental and regulatory compliance risks, Clean Harbors asserted: “We are now, and may in the future be, a defendant in lawsuits brought by parties alleging environmental damage, personal injury and/or property damage, which may result in our payment of significant amounts.”

Aamjiwnaang First Nation Chief Janelle Nahmabin told The Narwhal she had not received any information about the niobium waste that was trucked to Clean Harbors nearly a year ago. Other environmental groups The Narwhal reached out to, including Climate Action Sarnia-Lambton, had not heard of this waste transfer, either.

“The plan now has been executed in a very different way,” said Brennain Lloyd, project coordinator at Northwatch, a northeastern Ontario environmental advocacy group. “It’s moving the waste into the territory of another First Nation that is already heavily impacted by all of the industrial activities.”

When the province conducted a study on environmental stressors in the Sarnia area in 2023, it found that while the majority of the reports from residents about industrial pollution were related to petrochemical industries and refineries, a significant minority were related to the waste incineration facility Clean Harbors. Photo: Carlos Osorio / The Narwhal

‘Under a real nuclear shadow’: radioactive waste in northern Ontario

The company behind the Nova Beaucage mine was looking for much-desired uranium in the early days of the Cold War. 

It found trace amounts of it on a small island in Lake Nipissing, along with niobium, a naturally occurring mineral used to strengthen and lighten steel, which is useful when building electronics, cars, bridges and pipelines. After excavating, the company barged the ore across the lake to a mill they established on shore, on Nipissing First Nation territory.

“In northeastern Ontario, we live under a real nuclear shadow,” Lloyd said.

Nipissing First Nation residents were concerned about potential groundwater and lake contamination from the former Nova Beaucage mill site and the nearby property owned by Ontario’s Ministry of Transportation, which also stored the low-level radioactive tailings. Photo: Leah Borts-Kuperman / The Narwhal

In a letter to the federal Impact Assessment Agency in February 2026, the Anishinabek Nation cited the Nova Beaucage tailings as an example of the legacy of contamination that First Nations have been disproportionately impacted by due to poor government diligence. The letter puts the “toxic cocktail from Sarnia chemical valley” near Aamjiwnaang First Nation in the same category.

It was written in response to the proposal by the federally mandated Nuclear Waste Management Organization to store radioactive waste from nuclear power plants outside Ignace, Ont., a northern township between Thunder Bay and the Manitoba border. This waste has been temporarily stored in safe, but impermanent, containers for decades and finding a permanent solution has become an increasingly pressing issue — one that has only grown as Ontario ramps up nuclear power generation with small modular reactors in Bowmanville and a proposed full-scale nuclear facility in Port Hope. 

From First Nations in the Ignace area to those along the Ottawa River, concerned by leaks from a nuclear laboratory in 2024, communities have been pressing for better consultation when big radioactive waste decisions are made. The case of the Township of Nairn and Hyman illustrates why.

In June 2024, a Nairn and Hyman town councillor happened upon the planned dumping site for the niobium waste while out riding an all-terrain vehicle, or ATV, said Belinda Ketchabaw, the chief administrative officer of the township of less than 500 people. According to the township’s website, the councillor saw roadwork being done to facilitate the transportation of material the Ministry of Mines later told residents was naturally occurring radioactive material. Before that, residents say they had no idea about the relocation plan.

“We were aware that [the Agnew Lake] site was within our township. It’s been there for many, many years,” Ketchabaw told The Narwhal. “What we weren’t aware of is that the cover over the existing tailing site had depleted, through either people going across it on ATVs, or just rainwater eroding the cover.”

The Agnew Lake site already needed remediation, after uranium mining and milling operations ceased there in 1983. Tests from 2023 by the Ministry of Mines found uranium, radium, arsenic and more at the site. In a letter sent to the federal nuclear safety commission in the months after the councillor’s discovery, the township argued the arrival of niobium waste introduced “additional risks to an already precarious situation.” 

The province’s idea, according to an undated letter from the Ministry of Transportation, was for the niobium gravel to help provide an additional, less radioactive groundcover for the existing materials.

Nipissing First Nation had to excavate nearly 50,000 metric tonnes of the radioactive material from this site — enough to build the Statue of Liberty, twice. Photo: Supplied by Nipissing First Nation

“I guess what they were trying to do is, for lack of a better word, kill two birds with one stone,” Ketchabaw said. She made it her personal mission to get answers about the waste disposal that she said were not provided by the province — although the Transportation Ministry letter, uploaded to the Nipissing First Nation website, says the site was identified by the Ministry of Mines as a potential disposal location in 2016. This same letter explained that studies done by the ministry in 2012 determined the potential “risks of the tailings to human health were low.”

Ontario’s Ministry of Energy and Mines did not respond to The Narwhal’s questions, including around its protocol for informing communities about plans to store radioactive waste nearby.

“Ministries that are doing this type of work have to have advanced and meaningful consultation with municipalities, First Nations and residents,” Ketchabaw said. Agnew Lake is a source of drinking water for the Nairn and Hyman communities. She said they were given no assurances the environment and health of the community would be protected with this disposal.

“We weren’t consulted at all in this project. We came upon it by mistake,” Ketchabaw said. “It really felt like they were hiding this, like they were just kind of trying to sneak it in the back door.”

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