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Simandou Project
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About 200 kilometres south of the Arctic Circle, at the bottom of Lac de Gras in Canada's Northwest Territories, some of the world’s most beautiful and sought-after diamonds were found.
Diavik Diamond Mine comprised 4 diamond-bearing pipes that were mined using a combination of open pit and underground mining. Diavik produced predominantly stunning white diamonds, along with a small number of rare yellow diamonds, to the highest possible standards of safety and integrity.
All mines have a finite life cycle cycle, and Diavik planned for closure from the outset. Closure activities were integrated into mine planning and operations from the very beginning, making us a leader for closure in Canadian mining. With mining now complete, Diavik is progressing through decommissioning and reclamation. Buildings and infrastructure are being decommissioned, salvaged where practical, or demolished safely. Over time, embankments will be breached and lake water will be returned to the mined areas, reconnecting them with Lac de Gras once it is confirmed safe to do so.
The design, construction and operation of Diavik is a story of success on a grand scale, in part because it is in one of the most challenging environments in the world: the sub-Arctic tundra, a pristine landscape with a delicate ecosystem. We remain committed to protecting the biodiversity of this unique landscape. And, through innovation, world class engineering technologies and in collaboration with our Indigenous partners, we were able to mine some of the world’s most ethical diamonds with a minimal impact on the local land, water, wildlife, and people. These foundations continue to guide a responsible and carefully planned closure, with a focus on leaving the site safe and stable for the long term.
We developed world class engineering technology and techniques to hold back the waters of Lac de Gras (to reach the diamond-bearing pipes at the bottom of the lake) in a way that minimised disturbance.
As closure progresses, the mined areas will be filled with water again and, once criteria are met, the area will be reconnected to Lac de Gras as part of the long‑term reclamation plan.
Our focus on minimising our environmental impact and reducing the use of diesel was inherent in our construction of an award-winning wind farm that generates enough renewable energy to power Diavik’s underground mine. Over its operating life, the wind farm generated approximately 200 million kilowatt‑hours of renewable electricity, reduced greenhouse gas emissions and displaced millions of litres of diesel fuel.
Diavik also constructed the largest off‑grid solar power project in Canada’s North. The solar plant generates approximately 4.2 million kilowatt‑hours of carbon‑free electricity each year and will continue to play an important role in reducing emissions during closure activities.
We are working with the Government of the Northwest Territories and community partners to determine how the solar farm can best benefit the region following closure.
For 23 years of operations, Diavik played a transformative role in Northern Canada, leaving a legacy defined by caring, partnership, and long‑term benefit for Northern communities. Mining at Diavik provided steady, well‑paying jobs that strengthened families and communities. We provided hundreds of scholarships totaling more than $5 million, supported training and apprenticeship programs that provided valuable, transferable skills. Diavik also invested heavily in skills development, supporting more than 70 certified apprentices and over 130 graduates of the Northern Leadership Development Program.
Over its operating life, Diavik averaged approximately 1,100 jobs each year, with nearly half held by Northern Canadians, and 22% per cent by Northern Indigenous employees. In many cases, multiple generations from the same families worked at the mine. These opportunities increased household incomes, strengthened local capacity, and helped build a more resilient Northern workforce. Beyond direct employment, Diavik delivered significant economic and social benefits, providing more than $8 billion in Northern business spend, including $4.1 billion with Northern Indigenous businesses. Community investments included $5 million in scholarships, $9 million in donations, and more than $100 million in direct payments to partner communities. Together, these contributions helped build local businesses, leadership capacity, and community wellbeing that extends well beyond the life of the mine. As Diavik transitioned to closure, equal care was taken to support employees and communities through this change. The MyPath employee transition program invested more than $1.5 million in training, delivered over 500 individual coaching sessions, and achieved 95% employee engagement to help our people plan their next chapter. Hear from some of our people about Diavik’s MyPath Program. Diavik also helped establish the Yellowknife Community Foundation’s Northern Legacy Fund, providing enduring support for future generations, along with regional economic development initiatives and asset donations designed to stimulate long‑term economic activity. This thoughtful, well‑planned approach reflects Diavik’s commitment to ensuring closure is as successful and responsible as operations were. Diavik’s environmental legacy is grounded in responsibility, respect, and collaboration. Closure and reclamation are being carried out in close partnership with Northern Indigenous governments and communities, guided by Traditional Knowledge alongside western science. A Traditional Knowledge Panel provided more than 260 recommendations, supported by on‑the‑land camps and ongoing Traditional Knowledge‑based monitoring that continues through closure planning. The goal is to return the land and water to a safe condition for people, wildlife, and the continuation of traditional and cultural activities. As one measure of success, leaving a positive legacy means that when people of the North reflect on Diavik’s presence, they recognise the benefits, view closure as successful, and would welcome us back again as a responsible operator.
YELLOWKNIFE, Canada--(BUSINESS WIRE)-- After 23 years of operations and more than 150 million carats of rough diamonds produced before exhausting its economic reserves, Rio Tinto’s Diavik diamond mine in the Northwest Territories of Canada has celebrated its final day of production. Rio Tinto Iron & Titanium and Diamonds Managing Director Sophie Bergeron said: “Forty years ago there were
YELLOWKNIFE, Canada – Après 23 ans d’activité et plus de 150 millions de carats de diamants bruts produits avant l’épuisement de ses réserves exploitables, la mine de diamants Diavik dans les Terriritoires du Nord-Ouest du Canada a célébré sa dernière journée de production.La directrice exécutive de Rio Tinto Fer et Titane et Diamants, Sophie Bergeron, a dit : « Il y a quarante ans, il y avait trè
BEHCHOKǪ̀, Canada – The Tłı̨chǫ Government and Rio Tinto’s Diavik Diamond Mine marked a new stage in their decades-long partnership, signing a Closure Agreement on February 26, 2026, at a public ceremony at the Cultural Centre in Behchokǫ, Northwest Territories.Tłı̨chǫ leadership and Diavik officials signed the agreement in front of Tłı̨chǫ citizens, community members, Elders, and staff. The gathe
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