Canadian Energy Centre
Alberta oil sands legacy tailings down 40 per cent since 2015
Wapisiw Lookout, reclaimed site of the oil sands industry’s first tailings pond, which started in 1967. The area was restored to a solid surface in 2010 and now functions as a 220-acre watershed. Photo courtesy Suncor Energy
From the Canadian Energy Centre
By CEC Research
Mines demonstrate significant strides through technological innovation
Tailings are a byproduct of mining operations around the world.
In Alberta’s oil sands, tailings are a fluid mixture of water, sand, silt, clay and residual bitumen generated during the extraction process.
Engineered basins or “tailings ponds” store the material and help oil sands mining projects recycle water, reducing the amount withdrawn from the Athabasca River.
In 2023, 79 per cent of the water used for oil sands mining was recycled, according to the latest data from the Alberta Energy Regulator (AER).
Decades of operations, rising production and federal regulations prohibiting the release of process-affected water have contributed to a significant accumulation of oil sands fluid tailings.
The Mining Association of Canada describes that:
“Like many other industrial processes, the oil sands mining process requires water.
However, while many other types of mines in Canada like copper, nickel, gold, iron ore and diamond mines are allowed to release water (effluent) to an aquatic environment provided that it meets stringent regulatory requirements, there are no such regulations for oil sands mines.
Instead, these mines have had to retain most of the water used in their processes, and significant amounts of accumulated precipitation, since the mines began operating.”
Despite this ongoing challenge, oil sands mining operators have made significant strides in reducing fluid tailings through technological innovation.
This is demonstrated by reductions in “legacy fluid tailings” since 2015.
Legacy Fluid Tailings vs. New Fluid Tailings
As part of implementing the Tailings Management Framework introduced in March 2015, the AER released Directive 085: Fluid Tailings Management for Oil Sands Mining Projects in July 2016.
Directive 085 introduced new criteria for the measurement and closure of “legacy fluid tailings” separate from those applied to “new fluid tailings.”
Legacy fluid tailings are defined as those deposited in storage before January 1, 2015, while new fluid tailings are those deposited in storage after January 1, 2015.
The new rules specified that new fluid tailings must be ready to reclaim ten years after the end of a mine’s life, while legacy fluid tailings must be ready to reclaim by the end of a mine’s life.
Total Oil Sands Legacy Fluid Tailings
Alberta’s oil sands mining sector decreased total legacy fluid tailings by approximately 40 per cent between 2015 and 2024, according to the latest company reporting to the AER.
Total legacy fluid tailings in 2024 were approximately 623 million cubic metres, down from about one billion cubic metres in 2015.
The reductions are led by the sector’s longest-running projects: Suncor Energy’s Base Mine (opened in 1967), Syncrude’s Mildred Lake Mine (opened in 1978), and Syncrude’s Aurora North Mine (opened in 2001). All are now operated by Suncor Energy.
The Horizon Mine, operated by Canadian Natural Resources (opened in 2009) also reports a significant reduction in legacy fluid tailings.
The Muskeg River Mine (opened in 2002) and Jackpine Mine (opened in 2010) had modest changes in legacy fluid tailings over the period. Both are now operated by Canadian Natural Resources.
Imperial Oil’s Kearl Mine (opened in 2013) and Suncor Energy’s Fort Hills Mine (opened in 2018) have no reported legacy fluid tailings.
Suncor Energy Base Mine
Between 2015 and 2024, Suncor Energy’s Base Mine reduced legacy fluid tailings by approximately 98 per cent, from 293 million cubic metres to 6 million cubic metres.
Syncrude Mildred Lake Mine
Between 2015 and 2024, Syncrude’s Mildred Lake Mine reduced legacy fluid tailings by approximately 15 per cent, from 457 million cubic metres to 389 million cubic metres.
Syncrude Aurora North Mine
Between 2015 and 2024, Syncrude’s Aurora North Mine reduced legacy fluid tailings by approximately 25 per cent, from 102 million cubic metres to 77 million cubic metres.
Canadian Natural Resources Horizon Mine
Between 2015 and 2024, Canadian Natural Resources’ Horizon Mine reduced legacy fluid tailings by approximately 36 per cent, from 66 million cubic metres to 42 million cubic metres.
Total Oil Sands Fluid Tailings
Reducing legacy fluid tailings has helped slow the overall growth of fluid tailings across the oil sands sector.
Without efforts to reduce legacy fluid tailings, the total oil sands fluid tailings footprint today would be approximately 1.6 billion cubic metres.
The current fluid tailings volume stands at approximately 1.2 billion cubic metres, up from roughly 1.1 billion in 2015.
The unaltered reproduction of this content is free of charge with attribution to the Canadian Energy Centre.
Alberta
How economic corridors could shape a stronger Canadian future
Ship containers are stacked at the Panama Canal Balboa port in Panama City, Saturday, Sept. 20, 2025. The Panama Canals is one of the most significant trade infrastructure projects ever built. CP Images photo
From the Canadian Energy Centre
Q&A with Gary Mar, CEO of the Canada West Foundation
Building a stronger Canadian economy depends as much on how we move goods as on what we produce.
Gary Mar, CEO of the Canada West Foundation, says economic corridors — the networks that connect producers, ports and markets — are central to the nation-building projects Canada hopes to realize.
He spoke with CEC about how these corridors work and what needs to change to make more of them a reality.
CEC: What is an economic corridor, and how does it function?
Gary Mar: An economic corridor is a major artery connecting economic actors within a larger system.
Consider the road, rail and pipeline infrastructure connecting B.C. to the rest of Western Canada. This infrastructure is an important economic corridor facilitating the movement of goods, services and people within the country, but it’s also part of the economic corridor connecting western producers and Asian markets.
Economic corridors primarily consist of physical infrastructure and often combine different modes of transportation and facilities to assist the movement of many kinds of goods.
They also include social infrastructure such as policies that facilitate the easy movement of goods like trade agreements and standardized truck weights.
The fundamental purpose of an economic corridor is to make it easier to transport goods. Ultimately, if you can’t move it, you can’t sell it. And if you can’t sell it, you can’t grow your economy.
CEC: Which resources make the strongest case for transport through economic corridors, and why?
Gary Mar: Economic corridors usually move many different types of goods.
Bulk commodities are particularly dependent on economic corridors because of the large volumes that need to be transported.
Some of Canada’s most valuable commodities include oil and gas, agricultural commodities such as wheat and canola, and minerals such as potash.
CEC: How are the benefits of an economic corridor measured?
Gary Mar: The benefits of economic corridors are often measured via trade flows.
For example, the upcoming Roberts Bank Terminal 2 in the Port of Vancouver will increase container trade capacity on Canada’s west coast by more than 30 per cent, enabling the trade of $100 billion in goods annually, primarily to Asian markets.
Corridors can also help make Canadian goods more competitive, increasing profits and market share across numerous industries. Corridors can also decrease the costs of imported goods for Canadian consumers.
For example, after the completion of the Trans Mountain Expansion in May 2024 the price differential between Western Canada Select and West Texas Intermediate narrowed by about US$8 per barrel in part due to increased competition for Canadian oil.
This boosted total industry profits by about 10 per cent, and increased corporate tax revenues to provincial and federal governments by about $3 billion in the pipeline’s first year of operation.
CEC: Where are the most successful examples of these around the world?
Gary Mar: That depends how you define success. The economic corridors transporting the highest value of goods are those used by global superpowers, such as the NAFTA highway that facilitates trade across Canada, the United States and Mexico.
The Suez and Panama canals are two of the most significant trade infrastructure projects ever built, facilitating 12 per cent and five per cent of global trade, respectively. Their success is based on their unique geography.
Canada’s Asia-Pacific Gateway, a coordinated system of ports, rail lines, roads, and border crossings, primarily in B.C., was a highly successful initiative that contributed to a 48 per cent increase in merchandise trade with Asia from $44 million in 2006 to $65 million in 2015.
China’s Belt and Road initiative to develop trade infrastructure in other countries is already transforming global trade. But the project is as much about extending Chinese influence as it is about delivering economic returns.
Piles of coal awaiting export and gantry cranes used to load and unload containers onto and from cargo ships are seen at Deltaport, in Tsawwassen, B.C., on Monday, September 9, 2024. CP Images photo
CEC: What would need to change in Canada in terms of legislation or regulation to make more economic corridors a reality?
Gary Mar: A major regulatory component of economic corridors is eliminating trade barriers.
The federal Free Trade and Labour Mobility in Canada Act is a good start, but more needs to be done at the provincial level to facilitate more internal trade.
Other barriers require coordinated regulatory action, such as harmonizing weight restrictions and road bans to streamline trucking.
By taking a systems-level perspective – convening a national forum where Canadian governments consistently engage on supply chains and trade corridors – we can identify bottlenecks and friction points in our existing transportation networks, and which investments would deliver the greatest return on investment.
Alberta
Alberta’s number of inactive wells trending downward
Aspenleaf Energy vice-president of wells Ron Weber at a clean-up site near Edmonton.
From the Canadian Energy Centre
Aspenleaf Energy brings new life to historic Alberta oil field while cleaning up the past
In Alberta’s oil patch, some companies are going beyond their obligations to clean up inactive wells.
Aspenleaf Energy operates in the historic Leduc oil field, where drilling and production peaked in the 1950s.
In the last seven years, the privately-held company has spent more than $40 million on abandonment and reclamation, which it reports is significantly more than the minimum required by the Alberta Energy Regulator (AER).
CEO Bryan Gould sees reclaiming the legacy assets as like paying down a debt.
“To me, it’s not a giant bill for us to pay to accelerate the closure and it builds our reputation with the community, which then paves the way for investment and community support for the things we need to do,” he said.
“It just makes business sense to us.”
Aspenleaf, which says it has decommissioned two-thirds of its inactive wells in the Leduc area, isn’t alone in going beyond the requirements.
Producers in Alberta exceeded the AER’s minimum closure spend in both years of available data since the program was introduced in 2022.
That year, the industry-wide closure spend requirement was set at $422 million, but producers spent more than $696 million, according to the AER.
In 2023, companies spent nearly $770 million against a requirement of $700 million.
Alberta’s number of inactive wells is trending downward. The AER’s most recent report shows about 76,000 inactive wells in the province, down from roughly 92,000 in 2021.
In the Leduc field, new development techniques will make future cleanup easier and less costly, Gould said.
That’s because horizontal drilling allows several wells, each up to seven kilometres long, to originate from the same surface site.
“Historically, Leduc would have been developed with many, many sites with single vertical wells,” Gould said.
“This is why the remediation going back is so cumbersome. If you looked at it today, all that would have been centralized in one pad.
“Going forward, the environmental footprint is dramatically reduced compared to what it was.”
During and immediately after a well abandonment for Aspenleaf Energy near Edmonton. Photos for the Canadian Energy Centre
Gould said horizontal drilling and hydraulic fracturing give the field better economics, extending the life of a mature asset.
“We can drill more wells, we can recover more oil and we can pay higher royalties and higher taxes to the province,” he said.
Aspenleaf has also drilled about 3,700 test holes to assess how much soil needs cleanup. The company plans a pilot project to demonstrate a method that would reduce the amount of digging and landfilling of old underground materials while ensuring the land is productive and viable for use.
Crew at work on a well abandonment for Aspenleaf Energy near Edmonton. Photo for the Canadian Energy Centre
“We did a lot of sampling, and for the most part what we can show is what was buried in the ground by previous operators historically has not moved anywhere over 70 years and has had no impact to waterways and topography with lush forestry and productive agriculture thriving directly above and adjacent to those sampled areas,” he said.
At current rates of about 15,000 barrels per day, Aspenleaf sees a long runway of future production for the next decade or longer.
Revitalizing the historic field while cleaning up legacy assets is key to the company’s strategy.
“We believe we can extract more of the resource, which belongs to the people of Alberta,” Gould said.
“We make money for our investors, and the people of the province are much further ahead.”
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