Here’s the thing nobody wants to admit: Greenland just became more strategically important to the rare earth supply chain than most people realize.
Critical Metals (Nasdaq: CRML) released 2025 drill results from its Tanbreez project that confirm what geologists suspected but hadn’t yet proven at scale. Area B: a previously underexplored zone adjacent to the Hill deposit: returned TREO (total rare earth oxide) grades ranging from 0.35% to 0.77%. More importantly, heavy rare earths comprised up to 27% of the mineralization.
That’s not background noise. That’s a resource extension at one of the planet’s largest rare earth deposits, located in a jurisdiction that isn’t China.
Why Area B Matters
The 2025 drilling program at Area B covered a 1,750-metre corridor along the eastern edge of the existing Hill deposit. Results showed consistent TREO grades between 0.35% and 0.61% across the entire program. The geology held. The mineralization didn’t peter out.
This isn’t just about tonnage. It’s about what’s in those tonnes.
Heavy rare earths: dysprosium, terbium, holmium, and the other elements on the bottom half of the lanthanide series: are the strategic payload. They’re essential for high-performance magnets in EV motors, wind turbines, and defense applications. They’re also scarce. Even within rare earth deposits, HREEs represent a fraction of the total mineralization. Most deposits are light-rare-earth-heavy, which are more abundant and less valuable.
Tanbreez’s HREE content of up to 27% puts it in a different category. For context, many Western rare earth projects struggle to hit 10% HREE content. This isn’t just about finding rare earths. It’s about finding the right rare earths.
Critical Metals CEO Tony Sage was direct: the new assay data is expected to add mineralized tonnage to the existing deposits and reinforce Tanbreez as a “strategic, long-life rare earth asset.” Translation: they’re expanding the economic footprint of a project that already has a pre-tax NPV of $3 billion.
The Strategic Metals Stack
Beyond the rare earth headline, Tanbreez hosts hafnium, gallium, cerium, and yttrium. These aren’t throwaway byproducts. They’re critical metals with their own supply constraints.
Hafnium is used in nuclear control rods and high-temperature alloys. Gallium is essential for semiconductor manufacturing and LEDs. Cerium has applications in catalytic converters and glass polishing. Yttrium is a component in phosphors, lasers, and superconductors.
The strategic calculus here isn’t subtle. You’re looking at a polymetallic deposit that checks multiple boxes on the critical minerals list. In a world where supply chain diversification is now a policy priority for Western governments, that matters.
Scale and Timeline
Let’s talk about the size of this thing.
Tanbreez currently has a resource of at least 45 million tonnes across the Hill and Fjord deposits. But the broader host rock covers approximately 5 km by 2.5 km and is estimated at 4.7 billion tonnes. That’s not a typo. The potential resource base is massive.
The 2025 drilling at Area B and the adjacent Fjord deposit showed grade continuity that supports further expansion drilling. For the 2026 field season, Critical Metals plans extension and infill drilling focused on optimizing pit designs and advancing mineral resource studies.
Tanbreez received environmental approval in November 2025. That’s a major derisking milestone in a jurisdiction like Greenland, where regulatory hurdles are real but navigable. The project is now in the optimization and financing phase, not the speculative exploration stage.
The market noticed. Shares jumped 10% on the Area B results. That’s not a sentiment-driven pop. That’s investors repricing the resource potential and timeline risk.
The China Problem
Here’s where it gets uncomfortable.
China controls roughly 90% of global rare earth refining capacity and over 60% of mine production. Beijing has demonstrated a willingness to use rare earth exports as a geopolitical lever, restricting exports when trade tensions escalate.
The West has recognized this vulnerability. The U.S., EU, and other governments have invested billions in critical minerals supply chain initiatives. But you can’t wish rare earth deposits into existence. You need actual geology, in actual jurisdictions, with actual capital to develop them.
Tanbreez sits in Greenland, which is politically stable, legally transparent, and aligned with Western interests. It’s also geographically remote, logistically challenging, and requires significant infrastructure investment. Those are real constraints. But compared to the alternative: continued dependence on Chinese supply chains: those constraints look manageable.
What Happens Next
Critical Metals is positioning Tanbreez as a long-life, large-scale rare earth project that can contribute meaningfully to Western supply chains. The 2025 Area B results support that narrative. The 2026 drilling program will define how much additional tonnage can be converted into measured and indicated resources.
The financing question looms. A project of this scale requires hundreds of millions in capex. But the policy environment has shifted. Governments are now willing to backstop critical mineral projects through offtake agreements, loan guarantees, and strategic investments. Tanbreez’s combination of scale, HREE content, and jurisdiction makes it a credible candidate for that kind of support.
There’s also the downstream question. Mining rare earths is step one. Refining them into usable oxides and metals is step two. Building a Western refining capacity to complement new mine supply is the bottleneck. Critical Metals will need to navigate that reality, either through partnerships with existing processors or vertically integrated development.
But first things first: prove up the resource, optimize the economics, and secure the capital. The Area B results move all three of those objectives forward.
The Broader Picture
Tanbreez isn’t the only non-Chinese rare earth project in development. Lynas in Australia, MP Materials in California, and Energy Fuels in Utah are all advancing production or processing capacity. But the demand curve is steep. Electrification, digitization, and defense modernization are all pulling on the same finite resource base.
The math is uncomfortable. Even with aggressive development of Western rare earth projects, China will remain the dominant supplier for years. The goal isn’t autarky. It’s reducing single-point-of-failure risk and creating alternative supply routes.
Tanbreez, if developed to production, would be one of the largest non-Chinese rare earth sources globally. That alone gives it strategic relevance beyond its economics.
The Bottom Line
Area B delivered what Critical Metals needed: proof that mineralization extends beyond the currently defined deposits, with HREE content that justifies expansion drilling. The grades are commercial. The scale is significant. The jurisdiction is aligned.
This isn’t a speculative exploration play anymore. It’s a resource definition and optimization story with a clear pathway to production, assuming capital and political will align.
The 10% share price move was the market’s initial reaction. Whether that holds depends on execution through the 2026 field season and beyond. But the geological fundamentals just got stronger.
Greenland isn’t going to solve the rare earth supply crisis overnight. But Tanbreez is now firmly on the short list of projects that could materially reduce Western dependence on Chinese rare earth supply over the next decade.
That’s the real headline.
