Tanbreez rare earth mine approval: project economics and schedule for engineers
Reviewed by Tom Sullivan

First reported on MINING.com
30 Second Briefing
Greenland’s government has approved Critical Metals’ mining and closure plans for the Tanbreez heavy rare earths project in southern Greenland, covering mine, processing plants, port and supporting infrastructure through to September 2050 but still requiring separate environmental, marine transport, health and safety and export approvals before construction can begin. The PEA pegs Tanbreez at an after-tax NPV of US$2.1 billion with US$290 million initial capex, initial output of about 85,000 tonnes per year and modular expansion potential to 425,000 tonnes, from a 45-million-tonne resource grading 0.4% TREO. Critical Metals targets first ore in late 2028 or early 2029, has a 15-year offtake for 15% of initial production with REalloys and a US$120-million EXIM Bank financing letter of interest, and is moving to 100% ownership via acquisition of European Lithium’s 7.5% stake.
Technical Brief
- Mining and closure plans signed 29 Sept define build–operate–rehabilitate sequence for mine, plants, port and support assets to Sept 2050.
- Construction remains contingent on separate approvals for environmental management, marine transport, health and safety and mineral exports, plus financial security.
- Same licence requires mineral exploitation to commence by June 2029, constraining schedule float for first ore and ramp-up.
- PEA uses a 15% discount rate to derive the US$2.1 billion after-tax NPV, indicating high hurdle economics.
- Site works already include footings for a pilot-plant headquarters and ancillary infrastructure, treated as separate from main mine construction.
- A 10,000 m drilling programme and acquisition of a former cruise ship for worker accommodation are intended to de-risk early development logistics in remote South Greenland.
Our Take
The planned Tanbreez rare earth mine in southern Greenland underpins Critical Metals’ proposed US$1.85 billion refinery in Romania (16 Sept 2026 piece), so Greenland permitting progress materially de-risks that downstream processing strategy and its patent-pending mixed-chloride flowsheet.
With Tanbreez’s relatively modest initial capex of about US$290 million against a PEA after-tax NPV of US$2.1 billion at a 15% discount rate, the project screens as one of the higher-margin rare earth developments in our database, which is likely to attract additional strategic offtakers beyond the current 15% allocation.
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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