IMC Rare Earths reports 95% terbium recovery tests

Rhea-AI Filing Summary

IMC Rare Earths Ltd (IMC) reports laboratory-scale metallurgical testwork results from its Itarantim ionic adsorption clay rare earth project in Brazil, highlighting terbium recoveries of up to 95.2% and the successful production of a mixed rare earth carbonate using an optimized hydrometallurgical route.

The project hosts approximately 1.1 billion tonnes of Inferred Mineral Resource containing all four principal magnet rare earth elements, with material in a 105.8 million tonne inferred domain averaging 8 ppm terbium. Average recoveries for magnet rare earth oxides included 66.1% for neodymium, 36.5% for praseodymium, 46.1% for dysprosium and 81.1% for terbium. All resources are classified as Inferred, which are considered too speculative for economic evaluation and do not have demonstrated economic viability. IMC has engaged ANSTO Minerals for the next phase of metallurgical work to further quantify recovery performance and support evaluation of potential development pathways.

Key Figures

Terbium maximum recovery: 95.2% Terbium average recovery: 81.1% Neodymium average recovery: 66.1% +5 more

8 metrics

Terbium maximum recovery 95.2% Maximum Tb₄O₇ leach recovery in best-performing composite COMP C2 at Itarantim

Terbium average recovery 81.1% Average Tb₄O₇ leach recovery in the best-performing composite COMP C2

Neodymium average recovery 66.1% Average Nd₂O₃ leach recovery range 51.8%–77.7% at Itarantim testwork

Praseodymium average recovery 36.5% Average Pr₆O₁₁ leach recovery range 33.1%–41.1% at Itarantim testwork

Dysprosium average recovery 46.1% Average Dy₂O₃ leach recovery range 31.3%–55.6% at Itarantim testwork

Inferred Mineral Resource tonnage 1.1 billion tonnes Approximate Inferred Mineral Resource at Itarantim containing four magnet rare earth elements

Terbium grade in inferred domain 8 ppm terbium Average terbium grade in 105.8 million tonne inferred domain at Itarantim

Inferred domain tonnage 105.8 million tonnes Tonnage of inferred domain averaging 8 ppm terbium at Itarantim

Key Terms

Inferred Mineral Resource, ionic adsorption clay, mixed rare earth carbonate, magnet rare earth elements, +2 more

6 terms

Inferred Mineral Resource financial

"hosts approximately 1.1 billion tonnes of Inferred Mineral Resource"

An inferred mineral resource is an early-stage estimate of the amount and grade of minerals in the ground based on limited sampling and geological evidence; think of it as a rough sketch of where valuable material might be, rather than a detailed blueprint. It matters to investors because it signals potential upside but carries high uncertainty—further drilling and study are needed before it can support mine planning or reliable economic forecasts.

ionic adsorption clay technical

"its Itarantim ionic adsorption clay project in Brazil"

A type of clay-rich soil that holds valuable metals, especially rare earth elements, loosely attached to the surfaces of its particles so they can be removed by mild washing. Investors care because these deposits are a lower-cost, easier-to-process source of strategic metals — like a sponge that releases salt when rinsed — which can affect supply, production costs and pricing in industries that rely on those metals.

mixed rare earth carbonate technical

"successfully produced a mixed rare earth carbonate using an optimized"

A mixed rare earth carbonate is a powdery chemical mixture made from processing ore that contains several different rare earth elements bound as carbonate salts. Think of it like a crude blend of valuable metals that still needs refining into individual elements or oxides used in magnets, batteries and electronics; its quantity, composition and price signal how much feedstock is available to downstream manufacturers and therefore affects supply, costs and investment prospects in related industries.

magnet rare earth elements technical

"containing all four principal magnet rare earth elements"

hydrometallurgical technical

"using an optimized hydrometallurgical route"

Hydrometallurgical describes methods that use water-based chemistry to dissolve, separate and recover metals from ores, concentrates or recycled materials, much like dissolving sugar to separate it from tea and then collecting the sugar back out. It matters to investors because these processes determine how much metal a project can realistically produce, the operating cost and environmental footprint, and therefore influence revenue potential, capital needs and regulatory risk.

leach recoveries technical

"returned strong leach recoveries for magnet rare earth elements"

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

What did IMC (IMC) announce about the Itarantim Project on this 6-K?

IMC Rare Earths announced laboratory-scale metallurgical testwork results from its Itarantim Project in Brazil, including high terbium recoveries and the successful production of a mixed rare earth carbonate using an optimized hydrometallurgical process.

What terbium recoveries did IMC (IMC) achieve at Itarantim?

Testwork on Itarantim material showed terbium (Tb₄O₇) recoveries with a range of 56.6%–95.2% and an average recovery of 81.1%, with the best-performing composite achieving up to 95.2% terbium recovery.

How large is the Inferred Mineral Resource at IMC’s (IMC) Itarantim Project?

The Itarantim Project hosts approximately 1.1 billion tonnes of Inferred Mineral Resource containing the four principal magnet rare earth elements. Within this, a 105.8 million tonne inferred domain averages 8 ppm terbium.

What recoveries were reported for other magnet rare earth elements at Itarantim?

Average leach recoveries were 66.1% for neodymium (Nd₂O₃), 36.5% for praseodymium (Pr₆O₁₁), 46.1% for dysprosium (Dy₂O₃) and 81.1% for terbium (Tb₄O₇), based on testwork with the CT Mineral laboratory.

What is the significance of the resource classification for IMC (IMC) at Itarantim?

The approximately 1.1 billion tonne resource at Itarantim is entirely classified as Inferred. Inferred Mineral Resources are considered too speculative for economic considerations and do not have demonstrated economic viability.

What are IMC’s (IMC) next technical steps for the Itarantim Project?

IMC has engaged ANSTO Minerals to conduct further quantitative metallurgical work on Itarantim material, aiming to further quantify recovery performance and characterize the mixed rare earth carbonate to support evaluation of potential development pathways.

AI-generated analysis. How Rhea-AI works. Not financial advice.

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Available on EDGAR 09/10/2026 - 08:30 AM Accepted by SEC EDGAR 09/10/2026 - 08:30 AM Learn about SEC filing dates

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 6-K

Report of Foreign Private Issuer

Pursuant to Rule 13a-16 or 15d-16

Of the Securities Exchange Act of 1934

For the month of September 2026

Commission File Number: 001-43421

IMC RARE EARTHS LTD

(Translation of registrant’s name into English)

Avenida Paulista, 1765, 7th Floor

São Paulo, São Paulo, 0311-930, Brazil

(Address of principal executive office)

Indicate by check mark whether the registrant files or will file annual reports under cover of Form 20-F or Form 40-F.

Form 20-F ☒ Form 40-F ☐

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized.

	IMC RARE EARTHS LTD
	Registrant
September 10, 2026	/s/ Francesco Scolaro
	Francesco Scolaro
	Chairman and Chief Executive Officer

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EXHIBIT INDEX

Exhibit Number		Description
99.1		Press Release dated September 10, 2026

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Exhibit 99.1

IMC Rare Earths Reports High-Grade Terbium Recoveries of Up to 95.2% at Itarantim Project

Testwork demonstrates exceptionally strong rare earth deposits, prime conditions for extraction, and successful production of mixed rare earth carbonate

SÃO PAULO, BRAZIL — September 10, 2026 — IMC Rare Earths Ltd (“IMC” or the “Company”) (NYSE American: IMC) today announced results from laboratory-scale metallurgical testwork at its Itarantim ionic adsorption clay project in Brazil, including terbium recoveries of up to 95.2% together with the successful production of a mixed rare earth carbonate.

The combination of high terbium grade and strong leachability is particularly significant, indicating rich rare earths and prime conditions for extraction. The Company believes these results place Itarantim among the highest-grade terbium-bearing ionic adsorption clay projects currently being evaluated globally.

Rare earths are critical to today’s and tomorrow’s technologies, including AI, robotics, advanced electronics and defense applications. Amid surging demand, companies and governments will benefit from a more diverse, reliable and secure supply of these essential components.

IMC is seeking to help meet that need through Itarantim, an ionic adsorption clay project in Brazil that hosts approximately 1.1 billion tonnes of Inferred Mineral Resource containing all four principal magnet rare earth elements: neodymium, praseodymium, dysprosium and terbium. The terbium findings are particularly high, measured at an average of 8 ppm terbium from material within a 105.8 million tonne inferred domain.

“We are very encouraged by these results, which mark an important step forward in our project,” said Frank Scolaro, Chief Executive Officer and Chair of IMC Rare Earths. “There has been an awakening around the world that we need greater supplies of rare earths from diverse areas. Our mission is to be a world-class supplier and our immediate focus is on further confirming the richness of our deposits.”

Strong recoveries of critical magnet rare earths

Dysprosium and terbium are among the scarcest and most highly sought-after elements, used in high-performance permanent magnets to help maintain strength at high temperatures. They are critical for applications including electric vehicles, wind turbines, robotics, advanced electronics and defense technologies.

Testwork conducted with the Instituto Federal do Rio Grande do Norte and its EMBRAPII-affiliated CT Mineral laboratory returned strong leach recoveries for magnet rare earth elements, including dysprosium and terbium.

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In the best-performing composite tested, COMP C2, terbium recovery averaged 81.1% and reached as high as 95.2%. Recoveries across the four principal magnet rare earth elements included:

MREO Element		Recovery range		Average recovery
Neodymium (Nd₂O₃)		51.8% – 77.7%		66.1%
Praseodymium (Pr₆O₁₁)		33.1% – 41.1%		36.5%
Dysprosium (Dy₂O₃)		31.3% – 55.6%		46.1%
Terbium (Tb₄O₇)		56.6% – 95.2%		81.1%

Building on the leach results, IMC also successfully produced a mixed rare earth carbonate using an optimized hydrometallurgical route. Mixed rare earth carbonate is an intermediate product that can be further processed to separate individual rare earth elements.

For ionic adsorption clay mineralization, leachability is a key measure of how readily rare earth elements can be released from the clay into solution. The high terbium recoveries achieved in laboratory-scale results provide an important indicator of the characteristics of the Itarantim mineralization.

“These are exceptional testwork results,” said Alexandre Rocha da Rocha, Tenured Professor of Geology at IFRN. “In my view, Itarantim stands as a global leader in scale and quality among ionic adsorption clay deposits. This gives us a clear pathway toward building a diversified supply of these critical magnet materials.”

Next phase of technical work

IMC has engaged ANSTO Minerals to undertake further quantitative metallurgical work on material from Itarantim, building on the results announced today.

The next phase of testing is intended to further quantify recovery performance and the characteristics of the mixed rare earth carbonate, providing additional data as IMC evaluates the project’s potential development pathway.

“IMC’s strengths are the richness of our deposits, the geology that allows efficient extraction, and the location,” Scolaro added. “Itarantim is in Brazil, a well-established mining jurisdiction with strong infrastructure and the local knowledge and technical expertise that have helped bring the project to this point. We aim to meet the world’s demand for a more diverse supply of rare earths.”

About IMC Rare Earths Ltd

IMC Rare Earths Ltd is a mineral exploration and development company focused on the exploration, development and long-term supply of certain rare earth elements. Its principal project is the Itarantim Project, an ionic adsorption clay rare earth deposit located in the states of Bahia and Minas Gerais, Brazil.

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Qualified Person Information

The CT Mineral leach recovery and MREC production testwork information in this announcement has been reviewed and approved by Alexandre Rocha da Rocha, Tenured Professor of Geology at the Federal Institute of Education, Science and Technology of Rio Grande do Norte (IFRN) (BSc in Geology, Universidade Federal do Rio Grande do Norte, 1986; MSc in Geosciences, UFRN, 1999), a Qualified Person as defined under Subpart 1300 of Regulation S-K. Prof. Rocha da Rocha is a distinguished Brazilian exploration geologist with over 40 years of mineral industry experience across Brazil and internationally. Widely recognized as a pioneer of ionic adsorption clay rare earth exploration in Brazil, he played a central role in discovering the country’s first world-class deposits of this style, including the Rocha da Rocha Province in Bahia — which encompasses the Monte Alto deposit, together with Serra Verde’s Pela Ema deposit in Goiás and Aclara’s Carina Project in Nova Roma, Goiás, discoveries that helped establish Brazil as an emerging global source of critical rare earth elements. Prof. Rocha da Rocha has directed the testwork strategy and interpretation of results underpinning Itarantim’s exceptional dysprosium and terbium leach performance.

Cautionary Note on Inferred Mineral Resources

The ~1.1 billion tonne project Inferred Mineral Resource referenced in this announcement is classified entirely as Inferred. Inferred Mineral Resources are considered too speculative to have economic considerations applied and do not have demonstrated economic viability. There is no certainty that further exploration or drilling will result in the upgrading of any part of this Inferred Mineral Resource to an Indicated or Measured Mineral Resource.

Forward-Looking Statements

Certain statements in this press release constitute forward-looking statements, including statements regarding the Company’s plans and objectives for the Itarantim Project, the targeted conversion of Inferred Mineral Resources to the Indicated category, planned metallurgical and engineering work, future hydrogeological and pilot testing, and potential development pathways.

Although the Company believes that the expectations expressed in these forward-looking statements are reasonable, it cannot assure you that such expectations will turn out to be correct, and the Company cautions investors that actual results, including drilling and resource conversion outcomes, may differ materially from the anticipated results.

These forward-looking statements are subject to a number of risks and uncertainties, including, but not limited to the economic viability of the Itarantim Project; the need for significant capital resources for the development of the Itarantim Project; our ability to successfully begin and sustain mining operations at the Itarantim Project; our ability to manage our development, growth and operating expenses; our lack of operating history on which to judge our business prospects and management; the availability of suitable infrastructure and labor; delays or failures in the performance of the third parties on which we rely; our ability to obtain the necessary permits and licenses for the Itarantim Project, including that, once obtained, such permits and licenses may be suspended, terminated or not renewed by governmental authorities; outbreaks, epidemics or pandemics; mining industry operational risk; severe adverse weather conditions; reputational harm, including as a result of the actual or perceived occurrence of any number of events; our relationships with local communities and other stakeholders; changes in environmental and mining laws, regulations and other legislation; the prices of or demand for rare earth elements; an adverse change in trade relations between the U.S. and Brazil; and those risk factors discussed in the Company’s filings with the Securities and Exchange Commission.

If any of these risks materialize or the assumptions prove incorrect, actual results could differ materially from the results implied by these forward-looking statements. These forward-looking statements are based on the Company’s current expectations and projections about future events that the Company believes may affect its financial condition, results of operations, business strategy and financial needs. The Company undertakes no obligation to update or revise publicly any forward-looking statements to reflect subsequently occurring events or circumstances, or changes in its expectations, except as may be required by law.

Media Contact

Investor Relations Contact

IMC Rare Earths Ltd

Investor Relations

Email: info@imcrareearths.com

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• EX-99.1 EX-99.1 31.2 KB