Caption: Harena Rare Earths targets heavy REE production near North America’s only operating rare earth mine in California.
The race to secure domestic critical mineral supply chains in the United States has found a new focal point in the arid landscapes of San Bernardino County. Harena Rare Earths (LSE: HREE), a company previously defined by its massive ionic clay project in Madagascar, has officially entered the North American arena. By securing an exclusivity agreement to acquire a suite of heavy rare earth and uranium exploration assets from Paradigm Critical Minerals, Harena is positioning itself at the heart of the “California Rare Earth Frontier.”
This move is not merely a geographic expansion; it is a strategic pivot into one of the most high-stakes geopolitical theaters in modern mining. Located in the shadow of MP Materials’ Mountain Pass mine: currently the only operating rare earth mine in North America: Harena’s new venture aims to fill a critical gap in the Western supply chain: the production of heavy rare earth elements (HREEs).
The Strategic Rationale: Geopolitics and Domestic Security
The United States currently faces a significant vulnerability in its high-tech and defense sectors due to its reliance on imported rare earth elements, particularly from China. While MP Materials has successfully revitalized light rare earth production (specifically neodymium and praseodymium) at Mountain Pass, the supply of heavy rare earths remains largely under foreign control.
Harena’s entry into California aligns with a broader federal mandate to de-risk the mineral supply chain. As we have seen with U.S. doubles down on critical minerals, the legislative environment in 2026 is increasingly supportive of projects that can demonstrate a clear path to domestic production.
For Harena, the California assets offer more than just rare earths. The presence of high-grade uranium mineralization adds a secondary layer of strategic value, tapping into the resurgence of nuclear energy as a cornerstone of the green transition. This “dual-commodity” potential makes the San Bernardino assets a unique proposition in the current market.
Project Breakdown: San Bernardino’s Hidden Potential
The assets Harena is targeting are located within an established mining district that hosts over 3,000 mines and 8,000 active claims. Despite this density of activity, the specific targets under Harena’s exclusivity agreement have remained largely underexplored by modern standards.
High-Grade Rare Earths
Historical sampling at the site has returned values of up to 2% Total Rare Earth Oxides (TREO). What makes these results particularly compelling is the elevated concentration of heavy rare earths. Unlike the “light” rare earths found at Mountain Pass, “heavy” rare earths like dysprosium and terbium are essential for high-temperature magnets used in electric vehicle (EV) motors and defense applications.
Uranium Co-occurrence
The project also features significant historical uranium intercepts. Records indicate 30.3 meters at 0.37% U₃O₈e, with internal high-grade zones reaching as high as 10% U₃O₈e. In a global market where uranium supply is tightening, these figures represent a significant upside for a junior explorer.
Comparative Analysis: Historical Grades and Potential
To understand the significance of Harena’s California move, it is helpful to look at how these historical grades compare with other North American projects.
| Metric | Harena (California Project) | Industry Average (US Peer Group) |
|---|---|---|
| Peak TREO Grade | 2.0% | 0.5% – 1.2% |
| Target Commodity | Heavy REE + Uranium | Mostly Light REE |
| Infrastructure | High (San Bernardino District) | Variable |
| Proximity to Processing | Near Mountain Pass Facility | Remote |
The Neighbor Effect: Leveraging Mountain Pass Infrastructure
Mining in California is notoriously complex from a regulatory standpoint, but Harena’s proximity to Mountain Pass provides a distinct advantage. MP Materials has already paved the way for modern rare earth operations in the state, securing substantial government funding to expand its processing and refining capabilities.
Harena’s strategy appears to be one of “neighborhood development.” By proving up a resource within trucking distance of existing or planned processing hubs, the company significantly reduces the capital expenditure required to reach production. This model reflects a trend we have observed in other Tier-1 jurisdictions, such as the Vicuña District in South America, where shared infrastructure and regional clusters drive project viability.
Portfolio Diversification: From Madagascar to the Mojave
Before this acquisition, Harena’s primary focus was the Ampasindava ionic clay project in Madagascar. While that project holds a massive resource: 699 million tonnes at 868 ppm TREO: operating in Madagascar carries inherent jurisdictional risks and logistical hurdles.
The California expansion provides a “safe haven” for Harena’s portfolio. For North American investors, a project located in San Bernardino County is far more palatable than one in East Africa, even if the geological profiles differ. The California assets represent a hard-rock, high-grade opportunity that complements the large-scale, lower-grade ionic clay potential in Madagascar.
Timeline and Next Steps
The exclusivity agreement with Paradigm Critical Minerals allows Harena to conduct a thorough technical, legal, and commercial due diligence process. The company has indicated that this phase will last several months, leading into a potential 12-to-24-month exploration and feasibility window if the acquisition proceeds.
Key milestones to watch in 2026:
- Completion of Due Diligence: Expected by mid-year, this will confirm the historical grades and land tenure.
- Initial Drilling Program: Harena will need to validate the historical 2% TREO and 0.37% uranium intercepts with modern, NI 43-101 compliant drilling.
- Strategic Partnerships: Look for Harena to engage with domestic processing firms or Department of Defense-linked agencies to secure early-stage backing.
Key Risks and Challenges
While the upside is considerable, Harena faces several significant hurdles:
- Permitting in California: The state has some of the world’s strictest environmental regulations. Even in an established mining district like San Bernardino, the permitting process for new exploration and eventual extraction is rigorous and time-consuming.
- Financing: As of late 2025, Harena reported a cash balance of approximately £600,000. While sufficient for initial operations, a full-scale exploration program in the US will require significant capital raises, potentially diluting existing shareholders.
- Market Volatility: Rare earth prices are subject to massive swings based on Chinese export policies and global EV demand. Harena’s success depends on these prices remaining high enough to justify US-based production costs.
The 2026 Outlook
Harena’s move into San Bernardino County is a bold attempt to capture the zeitgeist of the 2026 mining sector: domestic security, critical mineral independence, and the synergy of energy and technology. If the due diligence confirms the high-grade heavy rare earth and uranium potential, Harena could transform from a junior explorer with an African focus into a key player in the US critical minerals ecosystem.
As the global battery revolution continues to accelerate, the value of heavy rare earths will only grow. For Harena, the California frontier represents both a massive challenge and an unparalleled opportunity to secure its place in the new energy economy.
Market Snapshot: Critical Minerals Focus 2026
| Company | Project Location | Primary Mineral | 2026 Status |
|---|---|---|---|
| Harena Rare Earths | San Bernardino, CA | Heavy REE / Uranium | Due Diligence / Exploration |
| MP Materials | Mountain Pass, CA | Light REE (NdPr) | Production Expansion |
| Energy Fuels | Utah / Global | Uranium / REE | Processing & Production |
| Ucore Rare Metals | Alaska | Heavy REE | Demonstration Plant |
For more in-depth analysis on the minerals driving the energy transition, see our latest feature on The Skillings Power List.
