This is how we’re
redefining mining.

The Wheeler
River Project.

The Wheeler River Project is situated in the eastern portion of the Athabasca Basin region in northern Saskatchewan, and it is the site of a proposed In Situ Recovery (ISR) uranium mining project. It is located 35 km north-northeast of the Key Lake mill and 35 km southwest of the McArther River uranium mine, within the traditional territory of several Indigenous peoples. Denison Mines has an effective 95% ownership of the project, and as the project operator we are working closely with Indigenous groups and local communities to establish a positive legacy through the development of the project.

ISR MINING

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Community

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Environment

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IN SITU RECOVERY MINING

It’s not business
as usual, it’s
business UNusual.

In situ recovery (ISR) mining is widely used outside of Canada, but the Wheeler River Project will mark the first time this method is used at a Canadian uranium mining site. With no conventional tailings, no large waste rock piles, and no open pits or major earthworks, ISR mining is progressive, economical, and environmentally responsible.

Once the active mining is done, the mining zone will be restored to environmentally acceptable levels standards before the containment area around the mining zone will be removed, which is the freeze wall.

What is ISR Mining?

Simply put, ISR mining is the controlled injection of a liquid mining solution underground through a series of wells. The mining solution is moved through the ore body using low levels of pumping pressure, dissolving uranium along the way. Then the solution and the dissolved uranium are pulled back up to surface for processing. ISR is different from other mining methods because all the activity is managed from the surface.

How will ISR mining work at the Phoenix deposit?

Before any injection or recovery activities begin at the Phoenix deposit, a freeze wall will be installed around the area being actively mined. This freeze wall will extend from the surface down to the competent basement rock below the Phoenix ore body, creating an impermeable barrier between the active mining area within the ore zone and the surrounding regional groundwater. The freeze wall will remain in place until the mining is complete and the mining area has met the criteria set by the regulators as environmentally acceptable.

How does the mining solution reach the deposit?

Once the freeze wall is in place, a series of conventional wells (between 3 and 7 inches wide) are installed in the area called the ISR wellfield. The wells go through approximately 400m of sandstone into the Phoenix ore body.

These wells allow for either the injection of the liquid mining solution, or recovery of the solution that carries uranium that has been dissolved underground. These wells can also be used as monitoring wells, to allow us to collect samples in relation to the activities underground.

Does the ISR method use a lot of water?

The injection and recovery wells form a near-closed loop system, recirculating the mining solution as much as possible to reduce the amount of water required to create the mining solution. Recirculating the solution also reduces the amount of water that needs to be treated and tested against water quality objectives before being discharged into the environment.

Watch the video for more information on the ISR mining method.

COMMUNITY

We listen to communities and share benefits, even at the early stages of exploration.

Denison is proud to be a leader of exploration and development mining companies in relation to reconciliation. In 2021, Denison’s Board endorsed its Indigenous Peoples Policy; a first for companies operating in the areas where we operate. This policy sets out our commitment on action in relation to reconciliation in five key areas: Engagement, Empowerment, Environment, Employment, and Education.

Every community has their own unique needs in relation to how development activities occur in the region. We work hard to listen to their concerns, and we value their knowledge and insight. Our team members visit communities often to deepen our understanding of who they are and what matters to them.

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300

JOBS

2 YEARS OF
CONSTRUCTION

100

JOBS

10 YEARS OF
OPERATION

Economic opportunities.

Denison Mines is invested in hiring local talent and supporting local Indigenous-owned businesses whenever possible. The project will need to fill up to 300 jobs during 2 years of construction and approximately 100 jobs during 10 years of operation in a safe, above-ground work environment. Many of the required roles will be similar to roles at existing uranium operations, and ISR-specific training will be provided when necessary.

Meet the team.

Kevin Himbeault

Vice-President, Operations &
Regulatory Affairs

Carolanne Inglis-McQuay

Director, Corporate Social Responsibility

Janna Switzer

Director, HSE Regulatory Compliance

Xavier Ludac

Director, Project Execution

Kevin Himbeault

Vice-President, Operations &
Regulatory Affairs

I joined Denison Mines in 2022 to provide operational experience, leadership, and support to the team as we advance the Wheeler River Project through the various stages towards a future operating facility.  I bring significant operational and regulatory experience, with over 25 years of diverse involvement in the mining industry through consulting and operations management. In previous roles, I have been responsible for substantial improvements in mining and processing facilities, to ensure sustainability of operations, and have successfully facilitated environmental assessments in both the uranium and diamond mining sectors. Through my 18-years in direct operations management, I have led teams through multiple relicensing processes and provided senior management leadership for plant operations (including uranium processing, site infrastructure services, maintenance, and automation initiatives), as well as oversight of the development of safety, health, quality, environment, and radiation protection programs. I hold a Master of Science (MSc) degree in Toxicology from the University of Saskatchewan, which has uniquely positioned me to connect operational activities with environmentally responsible development.  Outside of Denison I enjoy spending time with my family, supporting their artistic endeavours, playing music, and engaging in numerous outdoor activities.
Carolanne Inglis-McQuay

Director, Corporate Social Responsibility

I am responsible for ensuring that Indigenous, community and social aspects are considered as part of the activities we are performing within Saskatchewan, with a particular focus on the Wheeler River Project. This covers areas such as negotiations with Interested Parties for various types of Agreements (Project, exploration or other), consideration of employment and business opportunities, community investment strategies and other.

I firmly believe that partnerships with our Indigenous and non-Indigenous communities are the key to our success, and that these partnerships add tremendous value to our company and our people.
I love to spend time in northern Saskatchewan; canoeing with my husband and two young daughters, cross-country skiing in the forests, and visiting and having tea with people.

Janna Switzer

Director, HSE Regulatory Compliance

I have been working on the Wheeler River Project since early 2020 and currently hold the position of Environmental Manager with Denison Mines.
My 20-year career in the resource and mining industry has allowed me the opportunity to focus and grow my understanding of how resource projects interact with the environment.

In my current role, I work to ensure the environment and people will remain protected throughout each phase of the Wheeler River Project. This begins with preplanning during the regulatory permitting stage and continues through Project operation with the implementation of monitoring and reporting.
I was originally drawn to the Wheeler River project because I believe that Uranium mining is supportive of a clean air economy. I value the team of people we have working on the Project as it takes dedication, collaboration, and innovation to lead a new In-Situ Recovery (ISR) mining technique in Canada.

Outside of my role with Denison, I enjoy spending quality time with my family of boys. I have two young sons, two old male dogs and a young at heart husband. All of whom keep me laughing as we navigate the world around us.

Xavier Ludac

Director, Project Execution

I joined the Denison Wheeler River Project in 2020 as the Senior Project Engineer. I work towards obtaining the required technical information to advance the level of project definition needed to support the Environmental Assessment. I also work to support the Projects technical team to advance the development of In-Situ Recovery (ISR) mining for use in the Athabasca Basin.

Prior to joining Denison, I spent over a decade in the Saskatchewan Potash mining industry. I held both technical and team leadership roles, guiding groups towards safe, effective and reliable production. Previous to the mining industry, I spent time in the manufacturing sector.

I settled in Saskatchewan in 2004 after obtaining my Engineering Degree in France and have been a resident of Saskatoon since then. I am proud to call the province of Saskatchewan home as the kindness of its people, and the natural beauty of its landscape is incomparable.

Outside of work you will find me outdoors near a lake or the river or in my kitchen cooking for my family and friends.

Chad Sorba

Director, Technical Services

Dana Harris

Projects Services Manager

Dustin Heisler

Manager, Health and Safety

Chad Sorba

Director, Technical Services

I have been employed with Denison Mines since 2006 and held roles in various capacities over that time. I hold a BSc. in Geology and have spent many years working in northern Saskatchewan in remote locations exploring and developing future uranium deposits.

Currently, I am working within Denison’s Evaluation group as the Technical Services Manager for the Wheeler River Project where I provide technical and operational leadership for all aspects of our In-Situ Recovery (ISR) mining method. This includes wellfield design and subsurface modelling. I value being part of a driven and innovative team who share a common goal of bringing a new mining method to the Athabasca Basin. ISR has the potential to be an economically and environmentally attractive alternative to traditional uranium mining methods with far reaching benefits to all those involved.

Outside of Denison I enjoy spending time outdoors, whether it be kayaking or paddle boarding on the lake, or simply going for a long run to take away the stress of daily life. Outdoors is the place for me.

Dana Harris

Projects Services Manager

Dana Harris joined Denison Mines in 2020. With almost 15 years of professional experience in Saskatchewan’s mining and resource industries, Dana is excited to use her extensive experience in project management, strategic planning, and business analysis to help progress the Wheeler River project. Dana holds a Bachelor of Science and a Master of Business Administration degree from the University of Saskatchewan. She enjoys spending time with her family, including her two young children Jack and Claire, and reading books.

Dustin Heisler

Manager, Health and Safety

Dustin’s Health and Safety career began as a Construction Safety Officer in 2012 in the Saskatchewan potash industry and continued with Occupational Health and Safety education at the University New Brunswick. In 2019 Dustin achieved the highest Health and Safety designation in Canada after a successfully becoming a Canadian Registered Safety Professional. The majority of Dustin’s career in Health and Safety occurred in Fort McMurray, Alberta where he spent 8 years in the oil and gas industry. His role in Health and Safety provided oversite in various divisions including Upgrading, Extraction, Tailings, and tank farm storage. Dustin joined Denison in 2021 bringing with him a wealth of knowledge from working in various manufacturing and mining industries. Dustin continues to positively influence safety culture at Denison by accentuating the importance of being safe at work and at home.
His enthusiasm for health and safety is evident while at work but his passions include spending time with family and friends, fishing, hunting, boating, camping, and anything that gets him outdoors.

Less self-interest. More community interest.

We continue to engage with interested parties, including Indigenous and non-Indigenous communities potentially affected by the Wheeler River Project. Through ongoing outreach sessions, we have learned a lot about the environmental and community priorities that will make the project safe and successful for all.

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ENVIRONMENT

No conventional tailings.
No waste rock piles.
No underground workings.

Understanding the potential effects the Wheeler River Project will have on the environment is a priority for Denison Mines. The ISR mining method leaves no conventional tailings, waste rock piles, or underground workings. This will make it much easier to reclaim the site area when the operation is finished. The ISR method reduces the footprint and intensity of mining to maintain natural habitats—and that’s good news for all our partners. The lifespan of the Wheeler River project will be short compared to other operations in the area, meaning that closure and cleanup of the site is planned to be completed within a generation.

In the last several years, we have made significant progress in the Environmental Assessment process. In May 2019 the Wheeler River Project Description was accepted and made available to the public. In October 2022 we submitted a draft Environmental Impact Statement to the Saskatchewan Ministry of Environment and the Canadian Nuclear Safety Commission. The environmental assessment process includes a significant public commenting process that ensures transparency about the activities Denison is proposing, and how Denison plans to undertake the work.

Frequently asked questions.

What is ISR Mining?

In Situ Recovery or ISR is a method of mining an orebody in place. It involves using a liquid mining solution (referred to as a lixiviant), which is pumped through an orebody at depth via the use of injection and recovery wells to recover the uranium. Uranium is dissolved in place as the lixiviant travels from an injection well towards a recovery well and then back to surface as part of the mining process. The active ‘mining’ occurs in ground with recovery of the uranium occurring by leaching, as the mining solution passes through the uranium bearing host rock and dissolved the uranium. Specific to the Phoenix deposit, a freeze wall is installed from surface to the mining depth around the perimeter of the ore body to ensure the lixiviant is fully contained and does not travel into the surrounding environment.

What is the impact of ISR mining on water quality?

The overall environmental impact to surface water quality will be predicted through the environmental assessment process. The operational nature of ISR mining allows Denison to recycle a significant amount of water and we anticipate the volume of water to be released to the environment to be quite low compared to other Northern Saskatchewan mine sites. All site water will be tested and when required, treated to meet regulatory requirements established through the EA and licensing process to ensure the downstream environment remains protected.

Why is In Situ Recovery (ISR) only now being introduced in Canada?

ISR mining has gained in prominence in the uranium sector in the last 15 years with the development of uranium mines in Kazakhstan. When Cigar Lake and McArthur were developed, ISR mining was less common and was not considered applicable to the Athabasca Basin. Since then, advancements in ISR and ground freezing technology have allowed Denison to design an ISR mine that is expected to work for certain deposits in the Athabasca Basin.

What legacy will Denison leave behind for the people of northern Saskatchewan?

The people of northern Saskatchewan have clear ideas of how they want to work with the next generation of uranium mining operations, and so determining what kind of positive legacy Denison will have within the north must be determined by the people of northern Saskatchewan and Denison together.

When will construction and mining start?

Construction timing depends on the completion of several stages of the Environmental Assessment (EA) process. The total lifespan of the Wheeler River project is estimated at 20 years. It is anticipated that construction will last for approximately 2 years, the site will be operational for approximately 10 years, closure and reclamation procedures will last for approximately 8 years. Construction and production start dates are dependent on obtaining permits from the Province and the CSNC; as well as completion of detailed project engineering and financing.

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