RAPAPORT… Star Diamond Corporation has started legal proceedings against Rio Tinto, accusing the mining giant of failing to comply with the terms of a joint-venture agreement.
In 2017, Rio Tinto closed a deal with the Canadian miner, giving it the right to acquire shares in the Star-Orion South exploration project in Saskatchewan. In November, five years earlier than its original deadline, Rio Tinto gave Star Diamond notice it wanted to purchase a 60% stake in the site.
However, a review by a special committee at Star Diamond, together with independent legal counsel, found that Rio Tinto had not complied with all the terms of the agreement, Star Diamond said last month.
“Star Diamonds is committed to…enforcing all of [its] rights under the agreement,” the company explained at the time, noting it intended to reach a resolution, either through the courts or by a “negotiated solution.”
Star Diamond has filed suit in the Court of the Queen’s Bench for Saskatchewan, it reported last week.
“Rio Tinto will be strongly defending the legal proceedings on the basis that we have validly exercised the options,” a Rio Tinto spokesperson told Rapaport News Monday.
Image: The Star-Orion South exploration project. (Star Diamond)
Star Diamond Sues Rio Tinto over Canada Deal
The Bottom Line
- Star Diamond alleges Rio Tinto failed to comply with terms of their 2017 joint-venture agreement regarding the Star-Orion South project.
- Rio Tinto gave notice in November to acquire a 60% stake five years ahead of the original deadline, prompting Star Diamond's legal review.
- Star Diamond filed suit in Saskatchewan's Court of the Queen’s Bench, while Rio Tinto plans to vigorously defend its position.
Summary by Rapaport AI
More Stories

China Signs Deal to Reinvigorate Interest in Natural Diamonds
Shanghai Diamond Exchange hosts signing of Beijing Declaration, with government representatives from Botswana, Namibia and South Africa.

AI, Gen Z Are Hot Topics at AGS Conclave
This year’s edition is last to take place in September, as event returns to spring in 2027.

Patek Philippe Watch Could Fetch $4.9M at Phillips
Timepiece from 1945 is among highlights at Geneva sale.
