Tailings Ponds 

Our industry is working to reduce the size of tailings ponds and the time needed to reclaim them.

The Issue: Finding Solutions for Reducing the Oil Sands Footprint 

Oil sands are developed through two methods: open-pit mining and deep underground (in situ) production. In open-pit mining, companies use hot water to separate very heavy oil (bitumen) from the sticky sand. This water is then sent to a tailings pond – often a discontinued mine pit. The tailings are a mixture of water, clay, sand and residual bitumen. Tailings ponds allow the water to be recycled in the mining operation. While just 20 per cent of oil sands deposit can ever be produced by mining, the tailings ponds created are large and impact the landscape.

For oil sands mines, planning to reclaim areas is done before the first shovel of earth is moved. Returning a tailings pond to a sustainable landscape takes many years, because the fine silts in the ponds settle to the bottom very slowly. Once settling occurs, we remove the water and send it to another area of the mining operation. When the pond is properly drained, we contour it, replace topsoil and plant vegetation, trees and shrubs. We then assess the soil and vegetation on an ongoing basis to ensure we’re achieving the goals of the original plan. When the provincial government determines the area has met their criteria for reclamation, they will certify it and the land will be officially returned to the Province. In September 2010, Suncor completed surface reclamation of the 220-hectare Wapisw Lookout, formerly known as Pond 1.

Find out more about how industry works to protect birds 

 

What We’re Doing: Finding Innovative Ways to Reclaim Tailings Ponds 

Our industry is committed to reducing the size of tailings ponds, as well as the time needed to return them to sustainable landscapes. We believe research into and development of new technology will help us achieve this goal.

Technology and Innovation

Companies are developing new techniques to help reclaim tailings ponds. For example, Shell Canada Limited’s Albian Sands project uses thickeners in the tailings that allow water to be recaptured from the tailings, before they are released into the pond. This reduces the size of the pond and the amount of water the company uses in production.

Another innovative practice is at Canadian Natural Resources Limited’s Horizon project. Carbon dioxide (CO2) is captured from the facility and mixed with silts in the tailings, which causes a reaction that forms a solid, and allows the silts to settle more quickly. This process has multiple benefits: the CO2 is permanently trapped in the silts, and most of the water can be recycled while it’s still hot, so less energy is needed to reheat it. This results in reduced greenhouse gas emissions and smaller tailings ponds.

A number of universities and agencies are also researching new methods to speed up the separation of water and silts, faster recycling of water and new ways to return the land back to a sustainable landscape.

 

Tailings Technology: Reclamation Speeds Up

In 2010, Suncor Energy Inc. was recognized for its innovative tailings management process, TRO. The process boasts significant improvement in the speed of reclamation of oil sands tailings at the company’s existing oil sands operations near Fort McMurray.

Innovation Story: Shrinking the Tailings Pond

Canadian Natural Resources Limited (Canadian Natural) is using new methods resulting in less space for fluid tailings, accelerating the process of reclamation and reducing greenhouse gas emissions.

Canadian Natural is commercializing promising new ways to manage the tailings pond at its Horizon Oil Sands facility, 70 kilometers north of Fort McMurray. These new methods will require less space for fluid tailings, accelerate the process of reclamation and reduce greenhouse gas emissions.

Read more about this innovation

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Tailings Technology

Shelley Powell, Suncor Energy

shelley PowellThis is a
game-changer. The new technology that we've developed allows us to transform liquid material in our tailings ponds into this type of solid dry material in just a couple of weeks.

The Facts on Oil Sands

The Facts on Oil Sands

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Guiding Principles for
Oil Sands Development

People, Air, Water, Land

Canada's oil sands industry will provide a secure source of energy, reduce its impact on the environment and provide economic benefits to society while developing this globally significant resource. We will achieve this through continuous improvement, by developing new technology and by committing to a set of guiding principles.

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Oil Sands Tailings Consortium

Founded in December 2010 when seven of Canada’s largest oil sands mining companies came together to share tailings research and technology in a unified effort to rapidly advance tailings management. 

Learn More 

Government Regulations

In Alberta, the Energy Resources Conservation Board holds the government’s authority for establishing the criteria for managing oil sands tailings, as well as enforcement actions if tailings performance targets are not met.

Energy Resources Conservation BoardTailings Management
Jun 26, 2008
Tailings Performance Criteria and Requirements for Oil Sands Mining Schemes
Feb 3, 2009