Beaver Brook antimony mine idle under China Minmetals: supply risks for project teams
Reviewed by Tom Sullivan

First reported on MINING.com
30 Second Briefing
Canada’s only primary antimony operation, the Beaver Brook mine in Newfoundland and Labrador, remains on care and maintenance under China Minmetals’ ownership, despite nameplate capacity of about 6,000 tonnes of concentrate per year—roughly 5% of global supply. The shutdown follows Beijing’s 2024 export restrictions on antimony, which drove prices sharply higher and exposed Western dependence on Chinese mining, refining and processing. Policymakers now fear the asset could be used to “flood the market” and suppress rival projects, even as the US funds domestic players such as United States Antimony and Perpetua Resources’ Stibnite project.
Technical Brief
- Beaver Brook lies ~45 km southwest of Glenwood, Newfoundland and Labrador, in a remote inland setting.
- Production history is highly intermittent: start-up in 2012, shutdown 2013, restart 2019, then closure again in 2023.
- The mine is on formal care-and-maintenance, enabling relatively rapid restart if market or strategic conditions shift.
- Rumoured strategy, per Anthony Vaccaro, is to restart selectively to “flood the market” and depress prices.
- Beijing’s 2024 antimony export restrictions triggered sharp price rises, increasing the potential leverage of an idle Western asset.
- Policy debate now centres on whether foreign-controlled critical mineral assets should face security reviews similar to defence infrastructure.
Our Take
Antimony appears only sporadically in our 1,099 Mining stories, so Beaver Brook’s potential 5% share of global supply would make it unusually system-critical compared with most single-asset pieces in our database.
The US$500 million US critical minerals initiative cited here aligns with other critical minerals coverage where North American policymakers are prioritising non-Chinese supply for antimony, lithium and vanadium, which likely strengthens the strategic case for projects like Perpetua Resources’ Stibnite in Idaho.
China Minmetals’ 15-year control of Beaver Brook mirrors a pattern in our critical minerals coverage where Chinese state-linked entities hold key upstream positions in North America and Europe, giving them optionality to constrain or release supply without needing to divest assets.
Prepared by collating external sources, AI-assisted tools, and Geomechanics.io’s proprietary mining database, then reviewed for technical accuracy & edited by our geotechnical team.
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