17/06/2026
Diavik has mined its last diamonds.
After 23 years on Lac de Gras, the Northwest Territories mine is no longer an operating diamond producer. More than 150 million carats came out of the Arctic site before its economic reserves were exhausted.
Now comes the slower, quieter job.
Rio Tinto is moving Diavik through active closure, with major reclamation work expected to run from 2026 to about 2029. Buildings will be removed, disturbed ground will be cleaned up, and the mineโs engineered water barriers will eventually be breached so lake water can return to the open pits.
The goal isnโt to erase Diavik overnight.
Itโs to leave the site stable enough for long-term monitoring, which could continue into the 2040s. That means the mine may be closed, but regulators, Indigenous governments, technical crews, and environmental teams will still be involved for years.
For workers, the change is brutal.
Diavik once supported hundreds of direct jobs and many more through contractors, aviation, catering, maintenance, logistics, and Indigenous-owned businesses. Some people will stay during closure. Many wonโt.
That hits Yellowknife, Tลฤฑฬจchวซ communities, North Slave Mรฉtis families, and the wider Northwest Territories economy.
The mineโs closure agreements with Indigenous partners are meant to manage that landing, including jobs, training, contracts, and local oversight.
Diavikโs future is no longer diamonds.
Itโs cleanup, accountability, and whether Canadaโs North can replace one of its biggest industrial paycheques.
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