U.S.-based Critical Metals Corp. (Nasdaq: CRML) has received key environmental approvals for its Tanbreez rare earth project in southern Greenland, marking a major step toward the start of mining operations at one of the world’s largest rare earth deposits.
The company announced on Tuesday that the Environment Agency for Mineral Resource Activities (EAMRA) has approved the geochemical test work and mine closure plan for the Hill area of the project. The reports, submitted in late September, were prepared by Danish engineering firm NIRAS, a leading environmental consultancy in the Nordic region.
“The fast approval of these test reports, which can be credited to Greenland authorities as well as the professional work by NIRAS, is a key milestone for Critical Metals Corp towards commencing the mining process at Tanbreez,” said Tony Sage, CEO and Executive Chairman of Critical Metals.
According to the company, only a few approvals remain — including the final parts of the mine and closure plan and plans for specific activities at the site.
Following the announcement, Critical Metals’ shares rose nearly 3% to $11.26, giving the company a market capitalization of approximately $1.33 billion.
A World-Class Rare Earth Deposit
The Tanbreez project is among the largest rare earth deposits globally, with an estimated 45 million tonnes of resources spread across two main zones — Hill and Fjord. Roughly one-third of this total comprises heavy rare earth elements (HREEs), critical for clean energy technologies, advanced electronics, and defense applications. This makes Tanbreez the largest known heavy rare earth deposit worldwide.
A preliminary economic assessment (PEA) released earlier this year estimated the project’s net present value (NPV) at $2.8–3.6 billion (depending on discount rates of 15% or 12.5%) and an internal rate of return (IRR) of 180%. The company plans an initial production phase of around 85,000 tonnes of rare earth oxides per year, scaling up to 425,000 tonnes annually following modular expansion.
The orebody spans an area of 8 km by 5 km, but represents just 1% of the larger 4.7-billion-tonne host rock, suggesting strong potential for future expansion. Exploration work is ongoing at both deposit zones to support a forthcoming bankable feasibility study.
