SourcingJul 17, 2024
Rio Tinto’s Diamond Production Down 28% in Q2SourcingOct 08, 2024
Rio Tinto Begins New Phase of Production That Will Extend Diavik’s Life
Commercial production has begun underground at the Canadian diamond mine’s A21 pipe.
A sampling of rough diamonds from the Diavik Diamond Mine, which is located in Canada’s Northwest Territories and owned by Rio Tinto. Rio Tinto just announced that commercial production has begun underground at the mine’s A21 pipe.
Yellowknife, Canada—The first phase of commercial production has begun at Diavik’s A21 underground mine, Rio Tinto announced late last week.
The A21 pipe opened in 2018. It was the last pipe commissioned at the Diavik Diamond Mine and has operated as an open-pit mine, until now.
The transition to underground production will be rolled out in two phases.
Rio Tinto approved the first phase in February 2023, investing $40 million in the project.
It authorized the second phase earlier this year, sinking an additional $17 million into underground operations at A21.
Rio Tinto said the construction of the A21 underground mine involved the development of more than 1,800 meters (a little over a mile) of underground tunnels to access the orebody.
It noted there were no lost-time injuries during the 20 months it took to construct the tunnels.
Diavik Chief Operating Officer Matt Breen said, “The A21 underground operation is positive news for our employees, partners, suppliers, and local communities in the Northwest Territories, as it will enable operations to continue through to closure.
“Rio Tinto’s decision to proceed with phase two is a testament to the excellent performance of our Diavik team in successfully developing the underground mine beneath the previously mined A21 open pit.”
Related stories will be right here …
The A21 pipe opened in 2018. It was the last pipe commissioned at the Diavik Diamond Mine and has operated as an open-pit mine, until now.
The transition to underground production will be rolled out in two phases.
Rio Tinto approved the first phase in February 2023, investing $40 million in the project.
It authorized the second phase earlier this year, sinking an additional $17 million into underground operations at A21.
Rio Tinto said the construction of the A21 underground mine involved the development of more than 1,800 meters (a little over a mile) of underground tunnels to access the orebody.
It noted there were no lost-time injuries during the 20 months it took to construct the tunnels.
Diavik Chief Operating Officer Matt Breen said, “The A21 underground operation is positive news for our employees, partners, suppliers, and local communities in the Northwest Territories, as it will enable operations to continue through to closure.
“Rio Tinto’s decision to proceed with phase two is a testament to the excellent performance of our Diavik team in successfully developing the underground mine beneath the previously mined A21 open pit.”
Located in Canada’s Northwest Territories, less than 150 miles south of the Arctic Circle, the Diavik Diamond Mine opened in 2003 and has produced more than 144 million carats of diamonds in the 21 years since.
It is one of three remaining active diamond mines in Canada, alongside Ekati (owned by Burgundy Diamond Mines) and Gahcho Kué (owned by De Beers Group).
Diavik consists of four kimberlite pipes: the aforementioned A21, plus A154 North, A154 South, and A418.
The original life-of-mine plan for Diavik forecast that it would close in 2025, but the two phases of underground mining at A21 are expected to extend the mine’s life into the first quarter of 2026.
Meanwhile, Rio Tinto said it’s begun investing in Diavik’s closure and remediation of the land, focusing on site clean-up, equipment procurement, and other closure readiness efforts.
Earlier this year, the company announced it had completed construction on a solar power plant at Diavik that will provide as much as 25 percent of the power the mine will need for closure work.
The plant’s solar panels are bi-facial, meaning they generate energy from both direct sunlight and light reflecting off snow, which covers the ground in that area most of the year.
More on Sourcing
The Latest
AuctionsDec 12, 2025
13.54-Carat Paraíba Tourmaline Sets Records at Christie’sSet in a Tiffany & Co. necklace, it sold for $4.2 million, the highest price and price per carat paid for a Paraíba tourmaline at auction.
MajorsDec 12, 2025
David Webb Reveals Ice-Cold Holiday Window DisplayThe jeweler’s “Deep Freeze” display showcases its iconic jewelry designs frozen in a vintage icebox.
CollectionsDec 12, 2025
Piece of the Week: Oscar Heyman’s Sphene RingTake luxury gifting to new heights this holiday season with the jeweler’s showstopping 12-carat sphene ring.
Brought to you by
Impacting Tomorrow TodayHow Jewelers of America’s 20 Under 40 are leading to ensure a brighter future for the jewelry industry.
Events & AwardsDec 12, 2025
IGI Jewelry Design Contest Now Accepting SubmissionsThis year's theme is “Unveiling the Depths of the Ocean.”
Weekly QuizDec 11, 2025
This Week’s QuizTest your jewelry news knowledge by answering these questions.
TrendsDec 11, 2025
Pinterest 2026 Trend Report: Brooches, Bold Gold, Cool BlueIn its annual report, Pinterest noted an increase in searches for brooches, heirloom jewelry, and ‘80s luxury.
GradingDec 11, 2025
GIA to Offer Origin Determination for 3 More GemstonesStarting Jan. 1, customers can request the service for opal, peridot, and demantoid garnet.
Brought to you by
Roseco Releases New Full-Line CatalogRoseco’s 704-page catalog showcases new lab-grown diamonds, findings, tools & more—available in print or interactive digital editions.
IndependentsDec 11, 2025
Look Inside Day’s Jewelers’ Ninth StoreThe 111-year-old retailer celebrated the opening of its new location in Salem, New Hampshire, which is its third store in the state.
MajorsDec 11, 2025
Americas Gold Releases New Gold Chain CatalogThe new catalog features its most popular chains as well as new styles.
AuctionsDec 10, 2025
Francis Ford Coppola’s Watch Sells for $10.8MThe filmmaker’s personal F.P. Journe “FFC” prototype was the star of Phillips’ recent record-setting watch auction in New York.
WatchesDec 10, 2025
There’s A New Rolex Boutique in MiamiThe new location in the Design District pays homage to Miami’s Art Deco heritage and its connection to the ocean.
SurveysDec 10, 2025
Consumer Confidence Drops in November Inflations, tariffs, and politics—including the government shutdown—were among consumers’ top concerns last month.
Events & AwardsDec 10, 2025
MJSA Names 2025 Responsible Design Challenge WinnerSilas Smith of Meridian Metalworks won the challenge with his pendant that blends Australian and American landscapes.
AuctionsDec 09, 2025
‘Desert Rose’ Diamond Sells for $8.8M in Abu DhabiThe sale of the 31.68-carat, sunset-hued stone was part of Sotheby’s first series of events and auctions in Abu Dhabi.
ColumnistsDec 09, 2025
Holiday Sales Happen in December, Most Decisions Don’tMost customers who walk into your store this month have made up their minds. Your job is to validate their choice, Emmanuel Raheb writes.
TrendsDec 09, 2025
‘Once Upon a Time,’ Guzema Debuted Its Holiday CollectionThe collection features characters and motifs from Ukrainian folklore, including an enchanted mirror and a magic egg.
TechnologyDec 09, 2025
Gemvision Releases Updated MatrixGoldMatrixGold 3.11, the newest version of the jewelry design program, offers more flexibility, precision, and creative control.
Events & AwardsDec 09, 2025
MJSA Showcase Pavilion Returning to JA New York The pavilion will be part of the 2026 JA New York Spring show, scheduled for March 15 to 17.
MajorsDec 08, 2025
Juell Kadet, a ‘Lifelong Pillar’ of Rogers & Hollands, Dies at 96Kadet, a 1994 National Jeweler Retailer Hall of Fame inductee, helped grow the family-owned retailer in the Chicago area and beyond.
TechnologyDec 08, 2025
You’ve Heard of Smart Watches and Rings; Meet Smart EarringsBilled as the world’s smallest wearable, Lumia Health’s new smart earrings have a health tracker subtly embedded in the back.
TrendsDec 08, 2025
Amanda’s Style File: Celebrating December’s BirthstonesDon’t let those with December birthdays feel blue. Help them celebrate their month with blue zircon, turquoise, and tanzanite.
CollectionsDec 05, 2025
Piece of the Week: Robinson Pelham’s ‘Tsar Star’ EarringsThe new pink sapphire version of the piece dances with its wearer in the brand’s “Icons After Dark” holiday campaign.
TrendsDec 05, 2025
Pantone’s Color of the Year for 2026 Is … WhiteA choice that’s generated a lot of commentary, Pantone says “Cloud Dancer” marks a fresh start and encourages relaxation and creativity.
MajorsDec 05, 2025
Stuller Releases ‘Wrapped in Wonder’ CampaignThe manufacturer’s holiday campaign features a gift guide filled with trending designs and jewelry that can be personalized.
CrimeDec 04, 2025
Man Arrested After Allegedly Swallowing Fabergé Egg PendantThe man was charged with theft, accused of ingesting the necklace while in a jewelry store in Auckland, New Zealand.
IndependentsDec 04, 2025
Step Inside JR Dunn Jewelers’ Giant New Store The Florida independent expanded its store from 8,000 to 14,000 square feet, fulfilling the vision of its late co-founder, Jim Dunn.
