Oilsands waste is collected in sprawling toxic ponds. To clean them up, oil companies plan to pour water on them

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Oilsands waste is collected in sprawling toxic ponds. To clean them up, oil companies plan to pour water on them


FORT MCMURRAY, ALTA.—The toxic waste of the Canadian oilpatch has been quietly spreading in the boreal forest since bitumen mining began here in the 1960s.

The yogurt-like mix of clay, water, toxic acids, metals and leftover bitumen has sprawled in artificial ponds to cover an area twice the size of the city of Vancouver.

More than one trillion litres of the goop, called tailings, fill these man-made waste lakes that can be seen from space. An equivalent amount of water would take five days to tumble over Niagara Falls.

The contaminated tailings ponds attract and kill migrating birds. They emit methane and other greenhouse gases.

Despite years of public promises from officials that the tailings ponds would shrink and go away, they are growing. And in the meantime, troubling gaps are opening in the oversight system meant to ensure the oilpatch cleans up its mess. Alberta has collected only $1 billion from companies to help remediate tailings — a problem that is now estimated to cost about 100 times that.

Decades and billions have been spent on research and still there is no sure solution to a problem that is getting attention beyond Alberta. In August, the Commission for Environmental Cooperation — a NAFTA organization composed of officials from the U.S., Mexico and Canada — announced it would investigate and produce a report on tailings ponds and the threat they pose to surrounding groundwater and rivers.

Syncrude’s research includes the oil industry’s first full-size water-capped tailings pond, Base Mine Lake, near Fort McMurray, Alta. The pit was filled in 2013.
Syncrude’s research includes the oil industry’s first full-size water-capped tailings pond, Base Mine Lake, near Fort McMurray, Alta. The pit was filled in 2013.  (Codie McLachlan / StarMetro Edmonton)

While the world watches, the mining companies operating here have been allowed by regulators to pursue a clean-up technique called water capping.

It’s supposed to work like this: put the tailings into a mined-out pit, then cover it with fresh water from a nearby river or reservoir. The idea, according to oil producer Syncrude, is that the tailings will settle to the bottom and over time the lake will turn into a healthy ecosystem supporting fish, animals and aquatic plants.

“It’s biologically and chemically an impossible fantasy,” said David Schindler, a former University of Alberta professor and renowned freshwater scientist and officer of the Order of Canada.

Other scientists say the water-capped ponds may become effective in storing tailings even if they do not one day support aquatic life, though it will take years to be sure.

What is clear is that the technique is unproven, and by conditionally approving industry plans that include it, Alberta officials are signalling they still have no idea how they’re going to clean up the waste of the oilpatch.

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The Alberta Energy Regulator (AER) “can approve tailings management plans that rely on unproven technologies,” the agency said. Water capping “requires more research, assessment and policy direction.”

The ponds, meanwhile, are polluting the air and leaking out the bottom, possibly reaching surrounding groundwater and the nearby Athabasca River.

“One day, because of the environmental impacts, my people will become environmental refugees,” said Athabasca Chipewyan First Nation Chief Allan Adam.

“The ponds have just grown and grown for five decades,” said Jodi McNeill, policy analyst for environmental think tank Pembina Institute. “If we just continue kicking the can down the road, we could be leaving a legacy of at least tens of billions in cleanup costs … to future generations.”

Syncrude — which operates two bitumen mines in the oilsands and has nine tailings ponds — has been studying water capping since the 1980s, and says on its website that decades of company research shows it will work. That research includes the industry’s first full-size water-capped tailings pond, Base Mine Lake, which was filled in 2013.

A Syncrude report about Base Mine Lake, one of two obtained by the Star, shows that after its first year, 2014, the lake was toxic and inhospitable to most aquatic life. Schindler says the report shows high levels of methane in the overlying freshwater as well as oxygen levels that no fish and few invertebrates could tolerate. The levels of ammonia were toxic to most aquatic life and the dark water severely limiting to photosynthesis.

After reading the other report — detailing improving conditions in the lake two years later, in 2016 — another freshwater scientist, Neil Hutchinson, said the cap may not be deep enough to prevent wind gusts from stirring up and resuspending solids from the tailings waste about 10 metres below the surface.

“It’s a promising approach. It’s far from proven,” he said. “It might (end up becoming) a safe way to store tailings, but the jury is out on whether you’re going to end up with a nice self-sustaining system.”

Slicks of bitumen can occasionally float to the surface, the reports show.

Schindler calls Syncrude’s claim that the water-capped waste lakes will become healthy ecosystems “hubristic,” and the regulator “gullible” for approving several companies’ plans “without evidence that even one … can be restored as claimed.”

Nearby First Nations don’t want water capping. A consultant to Mikisew Cree First Nation says approving more water-capped lakes is “risky” and “irresponsible,” while the Fort McKay First Nation has called the idea a “major concern” that has “never been endorsed” by its community.

Syncrude spokesperson Will Gibson said “the water quality is improving” and the tailings are “consolidating,” adding that the company has spent $3 billion developing technologies to treat tailings. “We are confident this technology will prove to be successful.”


Oil companies are required to return the lands they develop to a natural state. But in August, after a bankrupt company simply left the province without decommissioning and cleaning up 4,000 wells, pipelines and other facilities, the CEO of the Alberta Energy Regulator took the unusual step of publicly addressing a “gap in the system” — an admission that showed the regulator is struggling to police the oilpatch. The CEO said that the incident has prompted the AER to look at ways to fix both the AER’s processes and its governing legislation.

The AER publicly says the province is protected from abandonment of tailings ponds because Suncor, Imperial, Syncrude, CNRL and other companies are required to put money into a fund called the Mine Financial Security Program. The fund has collected more than $1 billion from companies.

The cost to clean up the oilsands mining operations facilities? An estimated $130 billion, according to internal AER calculations revealed in a recent joint investigation by the Star, Global News and National Observer. That’s $100 billion more than the public had been told before. The tailings ponds make up the largest but unknown portion of this AER estimate.

To put this staggering amount into perspective, cleaning up after the 2013 Calgary flood cost $6 billion, and recovery from the Fort McMurray fire, $9 billion.

Dan Stuckless, industry relations manager with the Mikisew Cree First Nation. He says drying tailings has an advantage over water capping.
Dan Stuckless, industry relations manager with the Mikisew Cree First Nation. He says drying tailings has an advantage over water capping.  (Codie McLachlan)

If there were just a bucket of tailings in your kitchen, you could put the waste in the oven and dry it out in a few hours. Industrial-size amounts can be dried using centrifuges and additives. Drying tailings makes them easier to contain and less likely to contaminate the landscape.

“At least it doesn’t flow … We know it’s there. It’s a salty piece of dirt or junk,” said Dan Stuckless, industry relations manager with the Mikisew Cree First Nation, located downstream of the oilsands along the Athabasca River.

Companies have also treated tailings with gypsum or polymers, which speed up the water separation process. Canadian Natural Resources Ltd. is researching a way to eliminate the need for tailings ponds altogether.

Syncrude uses a $1.9-billion centrifuge, though it uses a lot of electricity. Wapisiw Lookout is a former tailings pond that Suncor dried out with a water-separating polymer and covered with soil, trees and native grasses in 2010, transforming it into a 220-hectare watershed that supports wildlife, including the occasional bear.

At one point, the AER ordered companies to solidify and bury the waste, an expensive process. Industry didn’t expect it would be so difficult to remove the water from the clay and other components of tailings, said Suncor spokesperson Sneh Seetal.

Industry didn’t comply. The government backed off.

Water capping is relatively cheap. During a 2012 hearing into a proposed oilsands expansion, a Syncrude company lawyer suggested it would cost less money and energy and require less land disturbance than centrifuging and another method called thin-lift drying.

Since 2016, four companies have told the AER they intend to use water capping despite the fact that the regulator hasn’t approved the technology. Though the regulator required the companies to submit plans for alternatives in case water capping fails, only one, Suncor, submitted a plan the regulator found sufficient. The companies have proposed a total of eight water-capped lakes that would store tailings.

Tailings are a yogurt-like mix of clay, water, toxic acids, metals and leftover bitumen that are kept in artificial ponds. They've sprawled to the point that they cover an area twice the size of Vancouver.
Tailings are a yogurt-like mix of clay, water, toxic acids, metals and leftover bitumen that are kept in artificial ponds. They’ve sprawled to the point that they cover an area twice the size of Vancouver.  (Todd Korol)

The regulator has issued conditional approvals requiring companies to research the technology further and allowing extra time — in some cases, years — to come up with alternatives. For example, Imperial Oil’s Kearl mine must present its alternative by 2027.

While AER waits, the waste is increasing, projected to reach 1.5 trillion litres by late 2030. The volume won’t begin to shrink until 2037, according to company filings and the Pembina Institute.

In 2009, embarrassed by international media coverage when 1,600 ducks died after landing on a Syncrude tailings pond — leading to an Alberta-record $3-million fine — provincial officials introduced the directive requiring companies to dry out and bury tailings. A government spokesperson said Albertans will have “certainty on … when and how (tailings ponds) are going to be closed … This has teeth.” Two premiers have since told Albertans the ponds would soon disappear from the landscape.

But the ponds are growing, and they’re right along the migratory pathways for millions of birds that use the freshwater Peace-Athabasca delta for breeding or as a stopover as they move farther north to breed.

Every spring and fall the ducks, loons, herons, raptors, songbirds and other birds, some of them rare, congregate. Those seasons are stormy, sending the birds in a hurry to find a safe spot to land.

A mechanical falcon, used as a bird deterrent, on Base Mine Lake north of Fort McMurray.
A mechanical falcon, used as a bird deterrent, on Base Mine Lake north of Fort McMurray.  (Codie McLachlan)

Mining companies are required to place bird deterrents on and around their ponds. The result is eerie: near-constant booms of bird cannons, nightmarish shrieks of radar-activated mechanical falcons and faceless scarecrows perched above the surface.

The ruses don’t always work. Every year an estimated 200,000 birds land on the oilsands’ industrial water bodies, including tailings ponds, according to a 2013 report by the University of Alberta’s Oil Sands Bird Monitoring Program.

“It only takes a dime-size drop of oil to kill a bird,” said Sarah Hechtenthal, a wildlife biologist. A spot of bitumen is difficult to get out before it puts a hole in the waterproof shell of a bird’s feathers. “They’re so focused on the little spot of oil, they won’t eat, they won’t evade predators, they get so focused on preening.” The oil could trouble the bird’s ability to fly or stay warm. Oil from a bird’s feathers could also clog the little holes on the surface of its eggs.

The ponds also leak.

While companies are required to build dikes, wells and ditches to detect tailings, collect them and divert them back to their source, some appears to be trickling to groundwater.

“Seepage … may take decades to reach surface waters,” said an internal 2009 memo, written by an associate deputy minister at Environment Canada, adding that “in their environmental assessments, many oil sands companies acknowledge that this may occur.”

Findings from a 2014 study by Environment Canada researcher Richard Frank and a team of Canadian and British scientists indicated oilsands-tainted groundwater was likely reaching the Athabasca River, the government has said.

The Athabasca River seen from Fort McMurray. Alta. Nearby residents, including First Nations, worry that contaminants from tailings are seeping into the water.
The Athabasca River seen from Fort McMurray. Alta. Nearby residents, including First Nations, worry that contaminants from tailings are seeping into the water.  (Codie McLachlan)

Environment Canada called the study “seminal” but stopped its proactive inspections around this time. A spokesperson told the Star it is not clear this seepage is harmful to the environment, and there is no definitive way to differentiate between groundwater that has been tainted by industry waste water and groundwater that has been impacted by naturally occurring bitumen deposits.

“We used to eat fish all the time as an important staple,” said Cleo Desjarlais Reece, a member of Fort McMurray First Nation. “But nobody does that anymore.”

Trappers are afraid to eat the animals they catch, fearing that the wildlife may have drunk contaminated water. “Am I safe? Am I keeping my family safe by eating this?” said Jean L’Hommecourt of Fort McKay First Nation, located 54 kilometres north of Fort McMurray and surrounded by mining operations.

Tailings ponds are also a source of air pollutants: “Smog-forming volatile organic compounds, methane (a greenhouse gas) and benzene (a toxic, carcinogenic volatile organic compound) … accounting for more than 70 per cent of a facility’s total,” according to the 2009 memo to the federal environment minister.

There is “shockingly poor regulatory oversight and lack of ambition on tailings management progress in Alberta,” the Pembina Institute told the AER in a February letter.


Wood bison wander near Wood Bison Viewpoint north of Fort McMurray in September.
Wood bison wander near Wood Bison Viewpoint north of Fort McMurray in September.  (Codie McLachlan)

Base Mine Lake is about 50 metres deep, most of it tailings. The water ripples in the breeze. A herd of wood bison grazes nearby, a fence separating the animals from the waves lapping at the grassy shore. Mechanical falcons screech from platforms above the surface and the cannons boom. Steam rises from the Syncrude plant on the horizon.

Below the surface, there is low oxygen, high salinity and naphthenic acids — byproducts of oil production that are toxic to fish and may be harmful to mammals — as well as chloride “much above provincial guideline,” said Schindler after reviewing the company’s latest internal report.

Megan Thompson, a freshwater scientist working as a consultant to Indigenous groups in the region, also reviewed the Syncrude test-lake reports and also noted high salinity, harmful to some freshwater life and “persistently high concentration of naphthenic acids.”

While Schindler noted some water-quality improvements and areas with “a handful” of organisms, natural lakes in the region would have “hundreds to a few thousand species.”

“I still see no convincing evidence that these are going to be productive, viable lakes. Nothing yet that would indicate that these will be the nice lakes in their promotional fantasies,” said Schindler, who has testified for intervenors in resource development hearings.

Before capping the Base Mine tailings, Syncrude built smaller test ponds in 1989, each holding 2,000 cubic metres of tailings and water. “In the first year, the water quality improved to support aquatic life,” said Gibson, the company spokesperson.

Syncrude scaled up to four test ponds of 140,000 cubic metres in the ’90s, then finished filling Base Mine Lake with water in 2013.

“What we found in our test ponds was that the technology works … We’re hoping to show it’ll do that on this scale,” Gibson said. “But it isn’t there yet.”

Canada’s Oil Sands Innovation Alliance, an industry group, said water-capped — or end pit — lakes “are a best practice in the global mining industry.”

In the Lusatia region of Germany, former coal mines have been transformed into a glimmering recreational lake district. Alberta has had success with mostly former coal mines, including Quarry Lake in Canmore. Water-capped Berkeley Lake in Montana, a former copper mine pit that was allowed to flood in the 1980s, is now filled with reddish-brown acidic waters that threaten to contaminate a nearby town’s water supply.

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Base Mine Lake was approved and filled under stricter regulations and after years of research and modelling, said Jerry Vandenberg, a pit lake expert who is sometimes contracted to work in the oilsands.

Vandenberg noted, though, that typical metal mine waste is often sand-like and separates from water “very rapidly,” while bitumen tailings contain clay particles that repel each other and stay suspended in the water.

Water capping is an understandable pursuit, says freshwater scientist Neil Hutchinson, who worked as a lake scientist for the Ontario environment ministry and has advised industry and government on resource development projects across Canada since becoming a consultant.

“All the tailings are out there. Those (mined-out) pits are out there, too. If you could put the two of them together to find safe, long-term storage, that’s a good idea — if it works as planned.”

The Alberta Energy Regulator says that a company must have a plan to return the land “back to how it looked and how it was used (or similarly) before development took place.”

Safe tailings storage was the main consideration for Base Mine Lake, said Vandenberg, and therefore, it is “following the right trajectories. … We’re seeing faster detoxification than what we predicted.” He also said it’s reasonable to anticipate the experimental lake could able to host fish in 10 to 20 years.

Greg Lawrence, an expert in rehabilitating polluted lakes and a former Canada Research Chair involved with monitoring Base Mine Lake, noted improving dissolved oxygen levels and said the tailings are settling as planned but “it is too early to make any judgments.”

The 2009 internal memo to the environment minister warned that after 15 to 20 years the sediments could generate methane gas bubbles “that could resuspend tailings and prevent settling and potentially mix fine tailings into this proposed water cap.”

Starting in 2021, the AER will begin getting the additional water-capping information it requested from companies, plus their backup plans.

“One thing about a lake is the bottom sediments is an important part of the productivity,” Schindler said. “If the whole deep part of the lake is just toxic gunk that nothing can live in, and you have this little bathtub ring around the edge where the clean water cap is, they’re not going to support fish and life.

David Bruser is a Toronto-based investigative reporter. Follow him on Twitter: @DavidBruser

“There is never going to be a situation where these lakes will be rimmed with cottages.”

Emma McIntosh is an environment, justice and investigative reporter with StarMetro Calgary. Follow her on Twitter at @EmmaMci

With files from Mike De Souza, National Observer. The Price of Oil series is the result of the largest ever collaboration of journalists in Canada, from the Toronto Star, Global News, the National Observer and journalism schools at Concordia, Ryerson, Regina and UBC.

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