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Canadian Energy Centre

Alberta oil sands legacy tailings down 40 per cent since 2015

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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basins or “tailings ponds” store the material and help oil sands mining projects recycle water, reducing the amount withdrawn from the Athabasca River.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

Alberta’s E3 Lithium delivers first battery-grade lithium carbonate

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E3 Lithium employees walk through the company’s lithium pilot plant near Olds

From the Canadian Energy Centre

E3 Lithium milestone advances critical mineral for batteries and electrification

A new Alberta facility has produced its first battery-grade lithium carbonate, showcasing a technology that could unlock Canada’s largest resources of a critical mineral powering the evolving energy landscape.

In an unassuming quonset hut in a field near Olds, Calgary-based E3 Lithium’s demonstration plant uses technology to extract lithium from an ocean of “brine water” that has sat under Alberta’s landscape along with oil and gas for millions of years.

Lithium is one of six critical minerals the Government of Canada has prioritized for their potential to spur economic growth and their necessity as inputs for important products.

“The use for lithium is now mainly in batteries,” said E3 Lithium CEO Chris Doornbos.

“Everything we use in our daily lives that has a battery is now lithium ion: computers, phones, scooters, cars, battery storage, power walls in your house.”

A vial of lithium at the E3 Lithium demonstration plant near Olds, Alta. CP Images photo

Doornbos sees E3 as a new frontier in energy and mineral exploration in Alberta, using a resource that has long been there, sharing the geologic space with oil and gas.

“[Historically], oil and water came out together, and they separated the oil from the water,” he said.

“We don’t have oil. We take the lithium out of the water and put the water back.”

Lithium adds to Canada’s natural resource strength — the country’s reserves rank sixth in the world, according to Natural Resources Canada.

About 40 per cent of these reserves are in Alberta’s Bashaw District, home to the historic Leduc oilfield, where E3 built its new demonstration facility.

“It’s all in our Devonian rocks,” Doonbos said. “The Devonian Stack is a carbonate reef complex that would have looked like the Great Barrier Reef 400 million years ago. That’s where the lithium is.”

Funded in part by the Government of Canada and the Government of Alberta via Alberta Innovates and Emissions Reduction Alberta (ERA), the project aims to demonstrate that the Alberta reserve of lithium can be extracted and commercialized for battery production around the world.

E3 announced it had produced battery-grade lithium carbonate just over two weeks after commissioning began in early September.

Inside E3 Lithium’s demonstration facility near Olds, Alta. Photo for the Canadian Energy Centre

In a statement, ERA celebrated the milestone of the opening of the facility as Alberta and Canada seek to find their place in the global race for more lithium as demand for the mineral increases.

“By supporting the first extraction facility in Olds, we’re helping reduce innovation risk, generate critical data, and pave the way for a commercial-scale lithium production right here in Alberta,” ERA said.

“The success from this significant project helps position Alberta as a global player in the critical minerals supply chain, driving the global electrification revolution with locally sourced lithium.”

With the first phase of the demonstration facility up and running, E3 has received regulatory permits to proceed with a second phase that involves drilling a production and injection well to confirm brine flow rates and reservoir characteristics. This will support designs for a full-scale commercial facility.

Lithium has been highlighted by the Alberta Energy Regulator (AER) as an emerging resource in the province.

The AER projects Alberta’s lithium output will grow from zero in 2024 to 12,300 tonnes by 2030 and nearly 15,000 tonnes by 2034. E3 believes it will beat these timeframes with the right access to project financing.

E3 has been able to leverage Alberta’s regulatory framework around the drilling of wells to expand into extraction of lithium brine.

“The regulator understands intimately what we are doing,” Doornbos said.

“They permit these types of wells and this type of operation every day. That’s a huge advantage to Alberta.”

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Alberta

Halfway River First Nation makes history with Montney natural gas development deal

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In northeast B.C., about 75 kilometres from Fort St. John, Halfway River First Nation sits in the heart of the Montney, one of North America’s largest natural gas plays. Photo courtesy Halfway River First Nation

From the Canadian Energy Centre 

By Will Gibson

Greg Kist has seen plenty of change during more than three decades working in the energy industry. But the former executive with Petronas and Progress Energy has rarely experienced a history-making moment.

That happened in July 2024, when the B.C. government awarded the Halfway River First Nation what’s known as oil and gas tenure in the heart of the Montney play.

It’s an agreement that grants the Nation decision-making authority over the exploration and development of petroleum and natural gas resources on more than 34,000 hectares of Crown land in its traditional territory, located approximately 1,000 kilometres northeast of downtown Vancouver.

That agreement is now moving further into action with a deal between Halfway River-owned Tsaa Dunne Za Energy (TDZE) and ARC Resources.

Members of the Halfway River First Nation participate in a field tour with the BC Energy Regulator in June 2025. Photo courtesy BCER

The agreement, signed earlier this year, will see TDZE work with Calgary-based ARC to develop about 25 per cent of the tenured land.

The region is adjacent to ARC’s existing Attachie natural gas operations, which are rich in high-value natural gas liquids.

The company describes Attachie as one of its most profitable assets, which can be expanded thanks to the TDZE agreement.

“This land was deferred from development for more than two decades while sitting in the premier natural gas play in North America,” says Kist, one of TDZE’s managing executives.

“Unlocking it will generate all kinds of economic activity and royalties for the B.C. government that help pay for schools and health care. But it will also generate the same benefits for the Halfway River First Nation.”

ARC plans to integrate the new areas using existing roads, pipelines and other infrastructure from Attachie.

Developing the land will still require consultation with the Halfway River First Nation.

Drilling in the Montney play straddles the border between northeast B.C. and northwest Alberta. Photo courtesy ARC Resources

“This is very much about Tsaa Dunne Za Energy delivering the best return on this particular asset for its shareholders, which are the members of the Halfway River First Nation,” Kist says.

In addition to granting tenure to develop oil and gas on the land, the B.C. government and Halfway River have implemented a landscape planning pilot to mitigate the impacts of development on the Nation’s Treaty 8 rights and manage potential cumulative effects of new development.

“The tenure award and landscape planning pilot will help to ensure that oil and gas development in these areas is sustainable and managed in accordance with the values of the Halfway River First Nation,” Chief Darlene Hunter said in a statement.

Kist sees the agreement as a template for other governments, energy companies and First Nations to follow.

“This has the potential to be the model for cooperative development so that we can develop resources in the right way that benefits governments, First Nations and industry. I’m proud to be a part of this because everybody involved wins from this.”

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