IMC Rare Earths finds 2,052 ppm yttrium oxide in Brazil

Neither yttrium zone has a mineral resource estimate, and no economic study has been completed for Block H or Block D.

Rhea-AI Filing Summary

IMC Rare Earths Ltd reported two yttrium-rich discoveries at its Itarantim project in Brazil: Block H returned 7 meters at 2,052 ppm yttrium oxide, and Block D returned 13 meters at 1,287 ppm. The Block H interval began 2 meters below surface; yttrium oxide made up 36% of its total rare earth oxides. Block D drilling ended at 27 meters while still in mineralization.

The results are exploration-stage: the zones are conceptual, and there has been insufficient exploration to estimate a mineral resource. IMC plans further drilling and metallurgical testwork at ANSTO in Australia. Some reported yttrium extraction percentages are estimates, not assay results, and require confirmation.

Key Figures

Block H yttrium oxide interval: 7 meters at 2,052 ppm Block D yttrium oxide interval: 13 meters at 1,287 ppm Block H yttrium oxide share of total rare earth oxides: 36% +3 more

6 metrics

Block H yttrium oxide interval 7 meters at 2,052 ppm Hole AD-00555; interval from 2 meters below surface

Block D yttrium oxide interval 13 meters at 1,287 ppm Hole AD-00403; interval from 14 meters depth

Block H yttrium oxide share of total rare earth oxides 36% Across the reported interval; Itarantim drilling database median approximately 10%

Block D estimated yttrium extraction 84% Estimated for 9 meters averaging 982 ppm yttrium oxide

Block D magnet rare earth oxides 1,457 ppm Across the broader 13-meter interval

Drilling database More than 870 drill holes Database in which the two zones contain some of the highest yttrium grades

Key Terms

ionic adsorption clay, yttrium oxide (Y2O3), total rare earth oxides (TREO), magnet rare earth oxides (MREO), +1 more

5 terms

ionic adsorption clay technical

"Itarantim ionic adsorption clay rare earth project"

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.

yttrium oxide (Y2O3) technical

"7 meters grading 2,052 ppm yttrium oxide (Y2O3)"

total rare earth oxides (TREO) technical

"36% of total rare earth oxides (TREO)"

Total rare earth oxides (TREO) is a single-number measure that adds up the concentrations of all rare earth elements in a sample, expressed as their oxide forms. Investors use TREO like a grade on a product label — higher TREO means a richer deposit or material, which usually increases its economic value and potential supply importance for technologies such as electric motors, wind turbines, and electronics.

magnet rare earth oxides (MREO) technical

"1,457 ppm magnet rare earth oxides (MREO)"

leach testwork technical

"leach testwork on this material"

FAQ

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

What yttrium grades did IMC report at Itarantim?

Block H returned 7 meters at 2,052 ppm yttrium oxide, and Block D returned 13 meters at 1,287 ppm. The Block H interval began 2 meters below surface; the Block D interval began at 14 meters depth and ended in mineralization at 27 meters.

What follow-up work does IMC plan for the Itarantim yttrium discoveries?

IMC plans further drilling and metallurgical work. Representative material will be collected for testwork at ANSTO in Australia, where leach testwork is intended to measure yttrium extraction from the high-grade zones. A deeper diamond hole is also planned to test mineralization beneath the hill at Block D.

Are IMC's reported yttrium extraction percentages assay results?

No. Some yttrium leach estimates were derived from measured extraction of other heavy rare earths because yttrium measurements exceeded the laboratory's 500 ppm upper detection limit. The company says these estimates are not assay results and are subject to confirmation.

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

Form 6-K: How Foreign Companies Report to the SEC →

See more from StockTitan in Google Search and AI answers. Adds StockTitan as a preferred source · opens Google

Add on Google Not now

Available on EDGAR 10/29/2026 - 08:16 AM EDT Accepted by SEC EDGAR 10/29/2026 - 08:16 AM EDT 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 October 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
October 29, 2026	/s/ Francesco Scolaro
	Francesco Scolaro
	Chairman and Chief Executive Officer

2

EXHIBIT INDEX

Exhibit Number		Description
99.1		Press Release dated October 29, 2026

3

Exhibit 99.1

IMC Rare Earths Announces High-Grade Yttrium Discoveries in Brazil

One discovery returns 7 meters of yttrium oxide at 2,052 ppm and another returns 13 meters of yttrium oxide at 1,287 ppm.

Highlights:

● Block H starts just 2 meters below surface. 7 meters at 2,052 ppm yttrium oxide, including 3 meters at 2,836 ppm. The peak sample reached 3,099 ppm.

● Block D remains mineralized at the end of the hole. 13 meters at 1,287 ppm yttrium oxide, including 9 meters with an estimated 84% yttrium extraction.

● Yttrium levels exceeded the ALS laboratory test limit. In six Block H samples and ten Block D samples, yttrium in the leach solution was above the test’s 500 ppm upper measurement limit. Yttrium extraction for these samples is estimated using other heavy rare earth results.

● Yttrium forms a large share of the rare earth content. 36% at Block H and 26% at Block D, versus about 10% across the drilling database. Peak grades rank among the top five of more than 870 holes.

SÃO PAULO, October 29, 2026 — IMC Rare Earths Ltd (NYSE American: IMC) (“IMC” or the “Company”) today announced two high-grade yttrium-rich discoveries at its Itarantim ionic adsorption clay rare earth project in Brazil. The results include a shallow, 7-meter intersection at Block H and a 13-meter intersection at Block D that remained mineralized when drilling stopped. The findings are exploration-stage results; further drilling and metallurgical work are required to establish their extent and commercial potential.

“Yttrium accounts for more than a third of the rare earth oxides in the Block H interval,” said Frank Scolaro, Chief Executive Officer and Chair of IMC Rare Earths. “This discovery could shape the product we ultimately seek to produce, adding yttrium to the group of rare-earth metals at Itarantim, alongside dysprosium and terbium. Yttrium is used in semiconductor equipment, aerospace components, lasers and advanced ceramics, making these discoveries relevant to efforts to diversify critical-mineral supply chains. Our job now is to establish how far these zones extend and confirm their extraction performance through further testwork.”

Next Steps:

● Block H: infill and step-out drilling to define the extent, thickness and continuity of the shallow, high-grade yttrium zone, with ammonium sulfate leach testing on all mineralized samples.

● Block D: diamond drilling to test the full yttrium-enriched zone beneath the hill, below the reach of auger drilling, together with step-out drilling around AD-00403 to expand the yttrium-rich and magnet rare earth domains.

Representative material will be collected for metallurgical testwork at ANSTO in Australia, and leach testwork on this material will provide a direct measure of yttrium extraction from the high-grade zones.

Block H Discovery:

At Block H, hole AD-00555 intersected 7 meters grading 2,052 ppm yttrium oxide (Y₂O₃) from only 2 meters below surface, including 3 meters at 2,836 ppm and a peak one-meter sample of 3,099 ppm. Yttrium oxide accounted for 36% of total rare earth oxides (TREO) across the interval, compared with a median of approximately 10% in the Itarantim drilling database. Six samples exceeded the ALS leach-solution measurement limit for yttrium; corresponding extraction percentages are estimates derived from measured extraction of other heavy rare earths, not direct yttrium assay measurements.

IMC RARE EARTHS | ITARANTIM YTTRIUM DISCOVERIES 1

Block D Discovery:

At Block D, hole AD-00403 returned 13 meters at 1,287 ppm Y₂O₃ from 14 meters depth, including 3 meters at 2,464 ppm, and ended in mineralization at 27 meters. Within that interval, 9 meters averaged 982 ppm Y₂O₃ with an estimated 84% yttrium extraction. The broader 13-meter interval also contained 1,457 ppm magnet rare earth oxides (MREO). A deeper diamond hole is planned to test mineralization beneath the hill beyond the reach of existing auger drilling.

Two separate zones contain some of the highest yttrium grades in a database of more than 870 drill holes; follow-up drilling and extraction testing are planned.

Cautionary statement regarding exploration results: The potential quantity and grade of the Block H and Block D yttrium zones are conceptual in nature. There has been insufficient exploration to estimate a mineral resource in these areas, and it is uncertain whether further exploration will result in the estimation of a mineral resource. Estimated yttrium leach extractions are not assay results and are subject to confirmation.

Drilling, Sampling and QA/QC

The Company’s technical team supervises drilling, with samples logged, photographed and processed under the Company’s exploration procedures. All holes are vertical (−90°) and sampled at one-meter intervals from surface. Samples are submitted to ALS in Vespasiano, Minas Gerais, for ME-MS81d (rare earth and trace elements plus whole rock) and ME-MS19 ammonium sulfate leach analysis. Sample batches include blanks, field duplicates and certified reference materials as part of the Company’s QA/QC protocol.

Qualified Person

The scientific and technical information in this news release, including the estimated yttrium leach extractions, has been reviewed and approved by Alexandre Magno da Rocha, MSc, a Qualified Person as defined in Subpart 1300 of Regulation S-K. Mr. da Rocha is a geologist with more than 40 years of mineral exploration experience in Brazil and internationally, and is widely recognized as a pioneer of ionic adsorption clay rare earth exploration in Brazil. Mr. da Rocha 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. He holds a BSc in Geology (1986) and an MSc in Geosciences (1999) from the Universidade Federal do Rio Grande do Norte and is a Tenured Professor of Geology at the Federal Institute of Education, Science and Technology of Rio Grande do Norte (IFRN). Mr. da Rocha is Director of IMC Rare Earths and is not independent of the Company.

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 rare earth elements. Its principal project is the Itarantim Project, an ionic adsorption clay rare earth deposit in the states of Bahia and Minas Gerais, Brazil.

IMC RARE EARTHS | ITARANTIM YTTRIUM DISCOVERIES 2

Forward-Looking Statements

Certain statements in this press release constitute forward-looking statements, including statements regarding the potential extent, grade and continuity of mineralization at Block H and Block D; the calculated yttrium leach extractions; the potential for Itarantim to become a source of yttrium concentrate; rare earth recovery and its variability; impurity characteristics; future drilling and metallurgical work; future resource additions and conversions; recovery, separation and product development; demand for and supply of rare earths; and the effects of export controls and geopolitical developments.

There has been insufficient exploration to define a mineral resource at Block H or the Block D yttrium zone. The Company has not established that reported exploration grades or laboratory extraction results will translate into commercially recoverable products or an economically viable operation, and no economic study has been completed on Block H or Block D.

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 actual results, including drilling and resource conversion outcomes, may differ materially from those anticipated. 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 its development; our ability to begin and sustain mining operations; our ability to manage our development, growth and operating expenses; our lack of operating history; the availability of suitable infrastructure and labor; delays or failures in the performance of third parties on which we rely; our ability to obtain and maintain necessary permits and licenses; outbreaks, epidemics or pandemics; mining industry operational risk; severe adverse weather conditions; reputational harm; our relationships with local communities and other stakeholders; changes in environmental and mining laws and regulations; 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 those implied by these forward-looking statements. The Company undertakes no obligation to update or revise publicly any forward-looking statements, except as may be required by law.

Investor Relations Contact: IMC Rare Earths Ltd, Investor Relations — info@imcrareearths.com

IMC RARE EARTHS | ITARANTIM YTTRIUM DISCOVERIES 3

Appendix 1. Yttrium leach data for the reported intercepts

Table A1. Yttrium leach by sample, AD-00555 (2 to 9 m) and AD-00403 (14 to 27 m)

Hole		From (m)		To (m)		Y2O3 (ppm)		Y in leach (ppm)		Lab Y leach (%)		Avg Dy-Ho-Er leach (%)		Y leach used (%)		Source
AD-00555		2.0		3.0		1,416		>500		Over limit		87		~94		Estimate
AD-00555		3.0		4.0		1,797		>500		Over limit		76		~82		Estimate
AD-00555		4.0		5.0		3,086		>500		Over limit		62		~68		Estimate
AD-00555		5.0		6.0		3,099		>500		Over limit		52		~58		Estimate
AD-00555		6.0		7.0		2,324		>500		Over limit		45		~50		Estimate
AD-00555		7.0		8.0		1,880		>500		Over limit		34		~38		Estimate
AD-00555		8.0		9.0		766		490		81		69		81		Lab
AD-00403		14.0		15.0		650		395		77		69		77		Lab
AD-00403		15.0		16.0		693		396		73		65		73		Lab
AD-00403		16.0		17.0		974		>500		Over limit		62		~68		Estimate
AD-00403		17.0		18.0		1,255		>500		Over limit		79		~86		Estimate
AD-00403		18.0		19.0		889		>500		Over limit		80		~87		Estimate
AD-00403		19.0		20.0		958		>500		Over limit		87		~95		Estimate
AD-00403		20.0		21.0		1,024		>500		Over limit		84		~91		Estimate
AD-00403		21.0		22.0		1,126		>500		Over limit		93		>95		Estimate
AD-00403		22.0		23.0		1,266		>500		Over limit		67		~74		Estimate
AD-00403		23.0		24.0		2,896		>500		Over limit		30		~34		Estimate
AD-00403		24.0		25.0		2,794		>500		Over limit		26		~30		Estimate
AD-00403		25.0		26.0		1,702		>500		Over limit		32		~36		Estimate
AD-00403		26.0		27.0		505		293		74		62		74		Lab

Y in leach: ALS ME-MS19 yttrium in solution; >500 = over the 500 ppm upper detection limit (stored as 505 in the database). Lab Y leach (%) = Y in leach / total Y. Where Y was within range the lab value is used (“Lab”); where it was over limit, Y leach is estimated as 1.057 × average Dy-Ho-Er leach + 2.5 (“Estimate”), fitted on 1,955 database samples with in-range yttrium; standard error ±4.6 percentage points. Estimates are not assay results.

IMC RARE EARTHS | ITARANTIM YTTRIUM DISCOVERIES 4

Filing Exhibits & Attachments

1 document

Press Releases

• EX-99.1 EX-99.1 54.9 KB