Company Insight · Brazil · Viridis Mining · Rare Earths · Critical Minerals · Processing
Viridis Mining: Building Brazil’s Western Rare-Earth Route
Viridis Mining is assembling the permits, finance, processing route and prospective buyers for the Colossus rare-earth project in Minas Gerais. The project has a large Probable Ore Reserve and an operating demonstration centre, but the commercial mine has not yet been built.
Viridis Mining is developing Colossus as a rare-earth mine and as the starting point for a Western-oriented processing, financing and purchasing network.
The July 2026 mineral resource estimate totals 473 million tonnes at 2,505 parts per million total rare earth oxides and 592 parts per million magnet rare earth oxides. Within that total, 305 million tonnes are classified as Measured and Indicated.
Viridis also reports a Probable Ore Reserve of 200.6 million tonnes at approximately 2,640 parts per million TREO and 740 parts per million MREO. The reserve provides a stronger development basis than a mineral resource alone, but it does not establish a confirmed 40-year operating life.
The July 2025 pre-feasibility study models a five-million-tonne annual plant and a 20-year mine plan using 98.5 million tonnes of material. It estimates average annual production of 9,448 tonnes of contained rare earth oxide, including 3,518 tonnes of magnet rare earth oxide.
The PFS equates approximately 189,000 tonnes of life-of-mine rare earth oxide production with approximately 266,000 tonnes of physical mixed rare earth carbonate. That corresponds to roughly 13,300 tonnes of MREC per year on average, rising to approximately 15,700 tonnes per year during the higher-grade years six to ten.
Viridis has produced mixed rare earth carbonate at a demonstration facility in Poços de Caldas. The commercial mine, full processing plant and final sales structure were still under development as of July 17, 2026.
For wider context, see Econosur’s analysis of Brazil’s critical-minerals question, the Serra Verde company insight, the Brazil Eco-Invest model and the regional mining and critical-minerals sector.
Core market reading:
Viridis is trying to secure buyers, political support, debt capacity, electricity and downstream processing before the commercial mine exists. That sequence can reduce market and financing risk. It also means the project depends on several agreements, permits and technical milestones that remain incomplete.
Why Viridis matters now
Colossus has moved beyond early exploration. Viridis now has a large resource, a Probable Ore Reserve, a pre-feasibility study, a demonstration processing centre, a Preliminary Licence and an Installation Licence application.
The company is advancing the project during a global effort to reduce dependence on Chinese rare-earth production and processing. China accounts for approximately 60 percent of global mine production and more than 90 percent of refining capacity, according to Reuters.
Viridis has responded by targeting buyers, finance institutions and industrial partners in Europe and the United States. The company has publicly rejected a China-centred offtake route and describes Colossus as a future source for Western supply chains.
The commercial structure remains unfinished. Viridis still needs the Installation Licence, updated feasibility work, final financing, construction, commissioning and binding customer agreements.
Colossus is being developed as a supply-chain project before it becomes an operating mine.
Viridis has connected the deposit with a demonstration centre, export-credit agencies, Brazilian development banks, the European Commission, Solvay and a planned Brazilian downstream venture. The next test is whether these relationships produce enforceable contracts and physical infrastructure.
Company profile: Australian listing, Brazilian operating base
Viridis Mining and Minerals Limited is listed on the Australian Securities Exchange under the ticker VMM. Colossus in Minas Gerais has become the company’s principal development asset.
Viridis acquired 100 percent of the rare-earth rights associated with the original Colossus portfolio in August 2023. Later agreements expanded the licence position to approximately 228.62 square kilometres within and around the Poços de Caldas alkaline complex.
The corporate model combines Australian equity-market access with Brazilian project companies, local technical teams, state environmental licensing and national development-finance relationships.
Viridis strengthened its board in 2026 with the appointment of Geoff Bedford, a former chief executive of Neo Performance Materials and Molycorp. His background is directly relevant to prospective offtake contracts, separation markets and Western rare-earth customers.
Resource and reserve: two different measures
The latest Colossus mineral resource estimate was published in July 2026. It totals 473 million tonnes at 2,505 parts per million TREO and 592 parts per million MREO.
The total includes 305 million tonnes in the Measured and Indicated categories at approximately 2,723 parts per million TREO and 659 parts per million MREO. Viridis also reported a Measured component of 31 million tonnes at 2,858 parts per million TREO and 758 parts per million MREO.
The Probable Ore Reserve is a separate measure. Viridis reported 200.6 million tonnes at approximately 2,640 parts per million TREO and 740 parts per million MREO in August 2025.
The reserve converted approximately 61 percent of the then-current Measured and Indicated resource. Viridis later amended or retracted parts of its original announcement. The reserve remains a development reference, but the earlier claim that it established a 40-year mine life should not be repeated as a confirmed operating schedule.
| Category | Reported figure | Meaning |
|---|---|---|
| Global mineral resource | 473 Mt at 2,505 ppm TREO and 592 ppm MREO. | July 2026 estimate across the wider Colossus portfolio. |
| Measured and Indicated resource | 305 Mt at approximately 2,723 ppm TREO and 659 ppm MREO. | Higher-confidence material relevant to feasibility work and financing. |
| Measured resource | 31 Mt at 2,858 ppm TREO and 758 ppm MREO. | Highest-confidence resource category currently reported. |
| Probable Ore Reserve | 200.6 Mt at approximately 2,640 ppm TREO and 740 ppm MREO. | Material judged economically mineable under the assumptions used for the reserve estimate. |
| PFS mine-plan material | 98.5 Mt. | Material used in the published 20-year economic model. |
Figures come from three separate announcements: the resource from July 2026, the reserve from August 2025, and the PFS mine plan from July 2025, which is based on the January 2025 resource model.
Analytical distinction:
A mineral resource estimates geological material. An ore reserve applies mining, processing, economic and modifying assumptions. The 20-year PFS plan uses less material than the reported reserve and should not be automatically extended into a longer mine life without an updated study.
The 97-million-tonne premium-feed layer
The July 2026 resource update identified approximately 97 million tonnes grading above 4,000 parts per million TREO and above 1,000 parts per million MREO.
This higher-grade material is important because Viridis intends to use it to support the early production schedule. Feeding higher-grade material during the first operating years could increase contained rare-earth output without requiring an immediate expansion of plant throughput.
The premium-feed inventory also strengthens the project-finance argument. Lenders focus heavily on the first repayment years, when construction debt remains high and the plant is still establishing operating reliability.
The existence of higher-grade material does not remove ramp-up risk. Mine sequencing, recovery, dilution, product quality and continuous plant availability will determine whether the modeled early cash-flow advantage is achieved.
What the pre-feasibility study actually models
The July 2025 pre-feasibility study models a five-million-tonne annual processing operation over 20 years. The mine plan uses 98.5 million tonnes from the Northern Concessions and Cupim South.
The modeled feed averages 3,380 parts per million TREO and 936 parts per million MREO. The study assumes average recovery of 57 percent for total rare earth oxides and 76 percent for the four principal magnet rare earths: neodymium, praseodymium, dysprosium and terbium.
The resulting production estimate is 9,448 tonnes of contained rare earth oxide per year. This includes 3,518 tonnes of magnet rare earth oxide per year.
The PFS states that total production of 189,000 tonnes of rare earth oxide over the mine life corresponds to 266,000 tonnes of MREC — approximately 13,300 tonnes of carbonate product per year on average. Output is not flat: the PFS schedules 11,139 tonnes of TREO per year in years six to ten, equivalent to roughly 15,700 tonnes of MREC. Reuters reported a commercial plant targeting approximately 15,000 tonnes of MREC per year from 2028. That figure reflects the higher-grade production years rather than the life-of-mine average.
The PFS estimates capital expenditure of USD 286 million before contingency. A 25-percent contingency increases the published pre-production capital estimate to USD 358 million.
A later Viridis announcement associated with the Export Development Canada financing process cited USD 356 million including contingency. The two-million-dollar difference is an inconsistency within Viridis’ own published material. This analysis uses the USD 358 million figure stated in the full PFS.
Reuters reported a later management estimate of approximately USD 360 million to USD 370 million, potentially reaching around USD 400 million if lenders require additional working capital.
| PFS indicator | Published figure | Interpretation |
|---|---|---|
| Annual ore throughput | 5 million tonnes. | Commercial plant capacity used in the PFS. |
| Modeled mine life | 20 years. | Published economic case based on 98.5 million tonnes. |
| Average annual REO | 9,448 tonnes. | Contained total rare-earth oxide, not total carbonate product mass. |
| Average annual MREO | 3,518 tonnes. | Contained Nd, Pr, Dy and Tb oxides. |
| Average physical MREC output | Approximately 13,300 tonnes per year. | Life-of-mine average based on 266,000 tonnes of MREC over 20 years. |
| Years 6–10 MREC equivalent | Approximately 15,700 tonnes per year. | Higher-grade period corresponding to 11,139 tonnes of annual TREO. |
| Capex before contingency | USD 286 million. | PFS capital estimate before the contingency allowance. |
| Capex including contingency | USD 358 million. | Full-PFS figure including a 25-percent contingency. |
The Poços de Caldas demonstration processing centre
Viridis inaugurated its research and processing centre in Poços de Caldas in May 2026. The facility can process up to 100 kilograms of Colossus material per hour.
The centre has produced mixed rare earth carbonate from ionic-adsorption clay. It gives prospective customers a physical product for testing and allows Viridis to refine recovery, reagent, washing and residue-management parameters.
The facility also supports technical due diligence by prospective lenders and industrial partners. A functioning demonstration circuit is more informative than laboratory batch testing alone.
The scale difference remains substantial. A 100-kilogram-per-hour demonstration line cannot prove that a commercial plant processing five million tonnes per year will achieve the same recoveries, reagent consumption, water balance, product quality and operating availability.
The demonstration centre gives Viridis a product, process data and customer samples. It does not yet provide commercial operating evidence.
The Western buyer strategy
Viridis has stated that it is prioritising buyers in Europe and the United States instead of entering a China-centred offtake route.
The position responds to a structural market concentration. China has approximately 60 percent of rare-earth mine production and more than 90 percent of refining capacity. New mines outside China can therefore remain dependent on Chinese separation, pricing and customer channels.
A Western route can connect Colossus with government-backed purchasers, export-credit agencies, development banks and industrial groups seeking alternative supply.
The same decision narrows the immediate pool of processors with proven capacity. Viridis must secure commercially viable separation, refining and purchasing arrangements outside the dominant Chinese system.
European and US customers are seeking magnet rare-earth material outside China-controlled supply routes.
Letters of intent and negotiations still require enforceable volumes, specifications, pricing and delivery commitments.
Low Chinese-influenced prices could weaken the economics of a higher-cost Western supply route.
EU priority status and the Solvay checkpoint
European Commissioner for International Partnerships Jozef Síkela visited the Poços de Caldas research and processing centre in June 2026.
Colossus was identified as one of four priority projects for accelerated cooperation between Brazil and the European Union. The visit placed local processing, technology transfer, employment and higher-value production in Brazil at the centre of the relationship.
The EU’s interest gives Viridis political visibility and access to institutions involved in strategic-mineral finance. It does not represent an EU purchase commitment or a completed project-finance package.
Viridis and Solvay signed a non-binding letter of intent in June 2026. Solvay operates rare-earth separation and chemical-processing capacity in La Rochelle, France.
The proposed relationship could provide a European outlet for mixed rare earth carbonate and technical cooperation on product processing. Viridis chief executive Rafael Moreno told Reuters that a definitive Solvay agreement could be completed by the end of July 2026.
As of July 17, the arrangement remained non-binding. The end-of-July target is therefore a measurable commercial checkpoint rather than a completed contract.
Commercial distinction:
EU priority status improves institutional access. The Solvay letter identifies a possible processor. Neither development guarantees project financing, final offtake volumes or construction.
Viridion and the attempt to retain processing value in Brazil
Mixed rare earth carbonate is an intermediate product. It must be separated into individual rare-earth products before metals, alloys and permanent magnets can be produced.
Viridis formed Viridion as a 50/50 joint venture with Ionic Rare Earths. The venture is intended to develop separation, refining and recycling capability in Brazil.
The joint venture has exclusive rights to use Ionic Rare Earths technologies outside Asia and Uganda for defined separation applications, as well as Brazilian rights linked to rare-earth recycling.
Viridion reflects Brazil’s ambition to retain more industrial value instead of exporting an intermediate mineral product for all later processing abroad.
The Solvay and Viridion routes are not mutually exclusive. Solvay could provide an earlier European processing channel, while Viridion represents a longer-term Brazilian downstream option.
| Processing route | Current status | Strategic role | Unresolved question |
|---|---|---|---|
| Viridis demonstration centre | Operating at demonstration scale. | Produces samples and operating data. | Can performance be maintained at commercial scale? |
| Solvay | Non-binding letter of intent. | Possible access to established European separation capacity. | Will a definitive sourcing agreement be signed? |
| Viridion | Development-stage 50/50 joint venture. | Could retain separation, refining and recycling value in Brazil. | What site, financing, permits and customers will support commercial operation? |
A layered financing structure
Viridis requires several hundred million dollars to construct Colossus. Equity raised for studies and early execution is materially smaller than the full project requirement.
In March 2026, Viridis completed an AU$25 million institutional placement at AU$1.90 per share. The company stated that the placement, existing cash and committed capital increased available funding to approximately AU$76 million.
Viridis also signed a binding staged investment agreement of up to USD 30 million with ORE Investments and Régia Capital. This strategic capital is intended to support project development and the path toward a final investment decision.
Export Development Canada issued a non-binding Letter of Interest for up to USD 100 million in November 2025. The letter was stated to remain valid until November 17, 2026, subject to due diligence, approvals and final documentation.
Export Finance Australia issued a non-binding and conditional Letter of Support for up to USD 50 million in January 2026. Viridis described this as completing the targeted export-credit component of its prospective debt framework.
Bpifrance Assurance Export has also provided a support signal linked to the project’s European industrial and supply-chain relationships.
BNDES and FINEP selected Colossus for coordinated support under Brazil’s strategic-minerals funding program. The project was subsequently included in Brazil’s Climate and Ecological Transformation Investment Platform.
These signals improve the project’s ability to assemble debt. They are not equivalent to a closed financing package. Letters of interest and support remain conditional on technical, environmental, commercial and credit due diligence.
The PFS mine plan draws on material that is 99.3 percent Indicated and only 0.7 percent Measured. That composition explains why the July 2026 Measured upgrade and the 97-million-tonne premium-feed inventory matter to lenders, who concentrate on geological confidence and cash generation during the first repayment years.
No completed definitive feasibility study was visible on Viridis’ public announcement list as of July 17, 2026. The PFS therefore remains the latest complete published economic case, while the July resource update provides newer geological information.
The financing structure connects Viridis with the wider public-private investment model examined in Econosur’s Brazil Eco-Invest analysis.
The Installation Licence remains the immediate construction gate
Brazil’s environmental licensing process separates preliminary approval, installation approval and operating approval.
COPAM granted the Colossus Preliminary Licence on December 19, 2025. The decision approved the environmental viability of the project in principle and allowed Viridis to advance toward the next licensing stage.
Viridis submitted the Installation Licence application in May 2026. Approval is required before the company can begin full commercial construction within the licensed scope.
The company has targeted a final investment decision during the second half of 2026. That timetable depends on the Installation Licence, updated engineering, financing negotiations and commercial agreements.
An Operating Licence would be required before commercial operation. Construction completion alone would therefore not establish the legal start of production.
The environmental conflict around water, jurisdiction and processing
The environmental section is central to the Colossus investment case because the project is located within the Poços de Caldas volcanic plateau and near an interconnected regional water system.
In November 2025, Brazil’s Federal Public Prosecutor recommended removing the Colossus and Meteoric Caldeira licensing cases from a scheduled COPAM vote. The MPF requested additional studies and consultations before approval.
The MPF described both projects as Class 6 developments, the highest state category for pollution potential. Each project proposes chemical processing of approximately five million tonnes of clay per year.
The MPF also demanded a pilot plant capable of demonstrating the technical feasibility and environmental safety of the proposed processing method before full project approval. Viridis’ demonstration plant subsequently received its operating licence in April 2026.
For Colossus, the MPF focused on the Poços de Caldas alkaline aquifer. It cited the possible suppression of 98 mapped springs, potential groundwater lowering, the absence of a regional water-impact study and insufficient evidence concerning nitrate contamination.
The MPF also questioned the long-term behaviour of processed clay after it is returned to mined areas. It requested stronger proof that ammonium-based processing residues could be removed or controlled before the material is treated as compatible with ordinary soil rehabilitation.
Additional issues included the project’s proximity to residential areas and a hospital, its location within an airport safety area and the need for relevant aviation approvals. The MPF also argued that separate project reviews did not adequately address cumulative impacts across the Poços de Caldas plateau.
The prosecutor's central argument is jurisdictional. Under article 10 §4 of Law 6,938/81 and article 4 of Federal Decree 8,437/2015, licensing of projects with significant regional environmental impact falls to IBAMA, the federal agency. The MPF holds that Colossus meets that threshold: the site sits in the recharge zone of the Poços de Caldas alkaline aquifer, near the São Paulo state line, within interconnected ecosystems and water bodies feeding interstate basins. The Preliminary Licence was nonetheless issued by COPAM, a Minas Gerais state body. The dispute is therefore not only about conditions but about which authority is competent to grant the licence.
Viridis disputes the 98-spring interpretation
Viridis rejected the claim that the project would eliminate 98 springs. The company said its hydrogeological study mapped 98 springs across the study area but identified only three that would be directly affected.
Viridis also said numerical hydrogeological modelling found no significant local or regional reduction in water availability. The company states that project water would be taken from existing reservoirs rather than new impoundments.
The company describes its process as leaching with an ammonium-based saline solution at near-neutral pH, followed by successive washing stages. Processed clay would be returned progressively to mined areas as dry material.
Viridis says the project will not require a conventional wet tailings dam. It also states that the processed residue has been classified as non-hazardous under the relevant Brazilian standard.
COPAM granted the Preliminary Licence on December 19 despite the MPF recommendation. The approval did not eliminate the underlying dispute. Water monitoring, residue behaviour, aviation approvals, cumulative regional effects, federal licensing competence and compliance conditions remain important licensing and financing issues.
| Issue | MPF position | Viridis position | What remains to be tested |
|---|---|---|---|
| Springs | Raised possible suppression of 98 springs. | Says 98 were mapped and only three would be directly affected. | Final licensed footprint and long-term monitoring. |
| Aquifer | Warned of recharge-zone and groundwater risks. | Cites numerical modelling showing no significant regional reduction. | Observed groundwater behaviour during construction and mining. |
| Nitrate and reagents | Requested stronger proof against groundwater contamination. | Points to near-neutral processing, washing and reagent recovery. | Commercial-scale reagent removal and monitoring data. |
| Residues | Questioned long-term effects of compacted processed clay. | Plans dry backfilling and progressive rehabilitation without a wet tailings dam. | Physical stability, drainage, revegetation and chemical behaviour. |
| Licensing authority | Argues that significant regional impacts require federal licensing by IBAMA. | Has proceeded through the Minas Gerais state licensing system. | Administrative and judicial decisions on federal or state competence. |
| Regional impacts | Requested integrated assessment of multiple mining projects. | Relies on the state process and project-specific EIA documentation. | Whether state or federal authorities require broader regional review. |
PL 500/2026 could change the rules around Poços de Caldas
PL 500/2026 was introduced in February 2026 by federal deputy Patrus Ananias of Minas Gerais.
The proposal would declare the Poços de Caldas alkaline complex and surrounding areas in Minas Gerais and São Paulo a National Rare-Earth Mineral Reserve.
The proposed reserve covers all or parts of 18 municipalities in Minas Gerais and 12 municipalities in São Paulo. It is therefore broader than the Colossus licence area and addresses the regional mining system rather than one company alone.
The bill would immediately suspend pending administrative procedures related to rare-earth exploration and development inside the designated area.
Article 4 lists research authorisations, mining concessions, environmental licences, public tenders and equivalent instruments at federal, state and municipal level, where these depend on or are conditioned upon federal mining titles.
The suspension would remain until the federal executive establishes special conditions for exploration, licensing, environmental protection and mineral development inside the reserve.
If enacted in its proposed form, the law could affect future Colossus licences, extensions, additional mining titles and regional infrastructure. It is therefore more than a transfer of licensing responsibility.
The bill's justification cites a civil inquiry opened by the Federal Public Prosecutor in Varginha (IC 1.22.012.000583/2025-83). The inquiry examines possible irregularities attributed to the Minas Gerais state government for allowing Preliminary Licences to be issued to foreign mining companies, and follows the mining-concession and environmental-licensing procedures for Colossus and Caldeira. It is not an investigation of Viridis' conduct.
A third proceeding targets the project's radiological status. In December 2025 the association Aliança em Prol da APA da Pedra Branca filed a collective writ of mandamus (case 6003300-50.2025.4.06.3826). It argues that technical evidence produced by the company itself, and recorded in the licensing file, shows parts of the analysed material exceeding the radiological exemption threshold — which would place radiological regulatory competence with the federal government. The radiological exemption is what keeps Colossus licensing at state level and shortens the approval path. If the exemption does not hold, that advantage reverses into federal review.
Regulatory distinction:
PL 500/2026 is still a legislative proposal, not current law. If enacted, however, it could freeze pending rare-earth procedures across the wider Poços de Caldas region until federal rules are defined.
Electricity and local industrial capacity
Colossus requires dedicated electricity, water systems, roads, laboratories, chemical handling and product logistics.
Viridis signed an agreement with DME Energética for dedicated grid and transmission infrastructure. The company presented the agreement as its first major project-delivery contract connected with commercial execution.
Dedicated electricity capacity removes one infrastructure uncertainty. Water systems, reagent logistics, site roads, residue handling, product packaging and export routes still require final engineering and implementation.
Poços de Caldas has an existing mining, industrial and technical base. Colossus could create demand for laboratories, water treatment, environmental monitoring, process automation, electrical systems and specialist maintenance.
| Infrastructure layer | Project function | Commercial variable |
|---|---|---|
| Electricity | Powers processing, pumping, laboratories and support systems. | Transmission completion, reliability and delivered cost. |
| Water systems | Support leaching, washing, recycling and site operations. | Permitted supply, reuse rates and observed aquifer effects. |
| Reagent logistics | Supply chemicals required for ion exchange and precipitation. | Transport, storage, cost, recovery and environmental control. |
| Product logistics | Moves carbonate product to a Brazilian or overseas processor. | Packaging, specifications, customs, route and customer location. |
| Technical services | Provide laboratories, engineering, maintenance and monitoring. | Availability of qualified local suppliers and personnel. |
Viridis and Serra Verde are at different project stages
Serra Verde provides the clearest Brazilian comparison for Viridis. Its Pela Ema operation in Goiás began production in 2024.
Serra Verde produces mixed rare earth carbonate containing dysprosium, terbium, yttrium and other rare-earth elements. It describes itself as the only significant producer of dysprosium and terbium outside Asia.
Viridis has produced carbonate at demonstration scale. It has not yet established continuous commercial output.
USA Rare Earth announced an agreement in April 2026 to acquire Serra Verde for USD 300 million in cash and approximately 126.849 million shares. The implied equity value was approximately USD 2.8 billion at announcement.
The transaction connects a producing Brazilian mine with a planned US separation, metal and magnet chain. Viridis is trying to establish comparable strategic relationships before construction.
Serra Verde also demonstrates the time required to develop a new ionic-clay project. Management statements associated with the transaction described approximately 16 years between early development and production.
| Company | Current stage | Product position | Central question |
|---|---|---|---|
| Serra Verde | Operating Pela Ema mine in Goiás. | Commercial mixed rare earth carbonate production. | How quickly can output expand and integrate with USA Rare Earth? |
| Viridis Mining | Development-stage Colossus project in Minas Gerais. | Demonstration-scale carbonate production. | Can permits, financing, construction and binding offtake be completed? |
Read Econosur’s full analysis of Serra Verde and Brazil’s operating rare-earth supply.
Risk map: permits, capital, scale and market structure
The immediate project risk is the Installation Licence. A delay or additional conditions could affect the final investment decision and construction schedule.
The second risk is licensing competence. The MPF argues that the project’s regional effects place environmental licensing under federal rather than state authority.
The third risk is radiological classification. A pending court case challenges the exemption that allows the project to remain under the shorter state-level regulatory route.
The fourth risk is financing. Viridis has several credible institutions around the project, but the full construction package has not yet been closed.
The fifth risk is process scale-up. The demonstration centre processes kilograms per hour. The planned commercial plant would process millions of tonnes per year.
The sixth risk is customer conversion. Western interest must become binding contracts with specifications, volumes, pricing, credit provisions and delivery obligations.
The seventh risk is environmental execution. The dispute over springs, groundwater, nitrates and residue behaviour will be tested through licence conditions and operating data.
The eighth risk is federal legal scrutiny. The MPF civil inquiry examines possible irregularities attributed to the state licensing process for Colossus and Caldeira.
The ninth risk is legislative. PL 500/2026 could suspend pending rare-earth procedures across the wider region if enacted.
The tenth risk is cumulative regional development. Regional reporting identifies several rare-earth and mining procedures seeking environmental approvals across the Poços de Caldas plateau. Water, roads, processing, waste and social effects may therefore be assessed across several projects rather than individually.
The eleventh risk is market concentration. China can influence rare-earth prices through its position in mining, refining and magnet production.
| Risk layer | What it means for Viridis | What to monitor |
|---|---|---|
| Installation Licence | Full construction depends on state approval and conditions. | FEAM decision, licence terms and compliance requirements. |
| Licensing competence | The MPF argues Colossus requires federal rather than state licensing. | IBAMA position, judicial rulings on competence, durability of the state-issued Preliminary Licence. |
| Radiological classification | A pending writ challenges the exemption that keeps licensing at state level. | Court decision, radiological testwork, any referral to federal regulators. |
| MPF civil inquiry | Possible irregularities attributed to the state licensing process remain under federal scrutiny. | Procedural findings, recommendations, litigation or new evidence. |
| PL 500/2026 | Could suspend pending rare-earth procedures across the region. | Congressional progress, amendments and federal implementing rules. |
| Definitive study | The July 2025 PFS remains the latest complete economic case. | Updated reserve, engineering, capital cost and production schedule. |
| Project financing | Support letters and placements do not close the construction package. | Binding debt, equity, ECA and strategic-investor commitments. |
| Process scale-up | Demonstration performance must transfer to continuous industrial operation. | Recovery, reagent use, water recycling, uptime and product quality. |
| Offtake | Solvay and other buyer discussions remain incomplete. | Definitive contracts, volumes, pricing and specifications. |
| Environmental compliance | Water and residue performance influence permits and finance. | Monitoring data, spring impacts, nitrate controls and rehabilitation. |
| Rare-earth prices | Revenue depends on Nd, Pr, Dy and Tb market conditions. | Chinese exports, refining policy, floor-price mechanisms and Western demand. |
Supplier-market signal
Colossus creates potential demand across mining, chemical processing, electricity, environmental services, laboratories and industrial construction.
The mining layer requires drilling, geological modelling, earthmoving, roads, fleet systems, surveying, rehabilitation and operational safety.
The processing layer requires pumps, tanks, filters, reagents, water treatment, instrumentation, automation, laboratories and corrosion-resistant materials.
The infrastructure layer requires transmission equipment, substations, civil construction, chemical storage, logistics, fire protection and maintenance.
The environmental layer requires hydrogeology, spring monitoring, water chemistry, biodiversity assessment, residue characterisation, community engagement and compliance reporting.
Why this company case matters for Brazil
Viridis tests whether Brazil can convert a large rare-earth deposit into a higher-value industrial system instead of exporting an intermediate product into an established foreign chain.
The project already connects geology, a Probable Ore Reserve, higher-grade early feed, demonstration processing, state licensing, development finance, electricity infrastructure, the European Commission and prospective industrial buyers.
Brazil’s policy objective extends beyond mineral exports. The country wants processing knowledge, technical employment and industrial value to remain inside Brazil.
The Viridion venture reflects that ambition. The Solvay route offers a more immediate connection to existing European processing. The eventual structure could combine Brazilian and European stages.
The central question is whether Viridis can convert institutional interest into a legally durable, financed and commercially stable operation. That distinction is also central to Econosur’s wider analysis of Brazil’s critical-minerals question.
Viridis has assembled many of the institutions required around a rare-earth mine. Colossus must now convert that network into durable permits, contracts, infrastructure and operating evidence.
This company insight prioritises Viridis and ASX disclosures, Brazilian government and environmental sources, Reuters reporting, Solvay information and official Serra Verde transaction material. Company projections are identified as estimates or targets. Demonstration processing is kept separate from commercial production throughout.
- Viridis Mining and Minerals — Corporate information, Colossus licence area and project positioning.
- Viridis Mining and Minerals — Current ASX announcements and project updates.
- Viridis — July 2026 mineral resource update: 473 Mt global resource, 305 Mt Measured and Indicated, 31 Mt Measured and 97 Mt higher-grade material.
- Viridis — July 2025 Colossus pre-feasibility study, 5 Mtpa design, 20-year plan, life-of-mine REO and MREC production, and capital estimates.
- Viridis — Maiden Ore Reserve retraction and amendment concerning the 200.6 Mt reserve announcement.
- Viridis — Preliminary Licence granted by Minas Gerais on December 19, 2025.
- Viridis — May 2026 Installation Licence application and project timetable.
- Viridis — March 2026 selection for Brazil’s Climate and Ecological Transformation Investment Platform.
- Viridis — European Commissioner Jozef Síkela’s June 2026 visit to the Poços de Caldas processing centre.
- Reuters — EU priority status, local processing, approximately 15,000-tonne annual MREC target and Solvay timetable.
- Reuters — Western buyer strategy, project-cost range and targeted 2028 production.
- Solvay — Non-binding letter of intent for rare-earth sourcing and technical cooperation.
- Ionic Rare Earths — Viridion joint venture and downstream technology rights.
- Brazilian Federal Public Prosecutor — Concerns regarding springs, aquifer impacts, nitrates, pilot processing, licensing competence and regional impacts.
- Viridis Mineração — Company response on springs, water modelling and project environmental measures.
- Brazilian Chamber of Deputies — PL 500/2026, proposed National Rare-Earth Mineral Reserve, civil inquiry and suspension of pending procedures.
- Collective writ of mandamus 6003300-50.2025.4.06.3826 — challenge concerning the radiological exemption and federal regulatory competence.
- Mining Weekly — Dedicated electricity and transmission infrastructure agreement with DME Energética.
- Serra Verde — Pela Ema production and mixed rare earth carbonate product.
- USA Rare Earth — April 2026 agreement to acquire Serra Verde and transaction terms.
Viridis raises practical questions for mining suppliers, processors, industrial buyers, development banks, environmental specialists and companies evaluating Brazil’s emerging rare-earth sector.
- When will Minas Gerais decide on the Installation Licence, and which conditions will apply?
- Will IBAMA or the federal courts determine that Colossus requires federal environmental licensing?
- Will the radiological exemption survive the pending judicial challenge?
- When will Viridis publish a definitive feasibility study or an updated full economic case?
- How will the July 2026 resource update affect the reserve, mine plan and early production schedule?
- Can the 97-million-tonne premium-feed inventory deliver the expected early cash-flow profile?
- How much of the construction requirement will be funded through equity, project debt and export-credit support?
- Will Viridis and Solvay sign a binding sourcing agreement after the June letter of intent?
- Which additional European or US buyers will sign long-term offtake contracts?
- Can demonstration-scale recoveries, reagent removal and water recycling be maintained at commercial scale?
- How many springs will be affected under the final licensed mine design?
- What will the MPF civil inquiry conclude about the state licensing process?
- Will PL 500/2026 advance, and how would it affect pending licences and future expansions?
- How much separation and refining will take place in Brazil through Viridion?
- Can Colossus remain financeable during periods of low rare-earth prices?
- Which Brazilian suppliers can participate in construction, laboratories, water treatment, automation and environmental monitoring?
From a rare-earth reserve to an industrial supply chain
Viridis provides a company-level view of how Brazil is trying to connect rare-earth geology with processing, development finance, European partners and higher-value domestic capabilities.
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Explore custom market analysisFAQ
What is Viridis Mining?
Viridis Mining and Minerals is an Australian-listed critical-minerals developer. Its main Brazilian asset is the Colossus ionic-adsorption-clay rare-earth project in the Poços de Caldas alkaline complex of Minas Gerais.
Is the Colossus rare-earth mine already operating?
No. Viridis operates a research and demonstration processing centre in Poços de Caldas. Commercial mining and full-scale production had not started as of July 2026.
How large is the current Colossus mineral resource?
The July 2026 mineral resource estimate totals 473 million tonnes at 2,505 parts per million TREO and 592 parts per million MREO. It includes 305 million tonnes in the Measured and Indicated categories.
How large is the Colossus ore reserve?
Viridis reports a Probable Ore Reserve of 200.6 million tonnes at approximately 2,640 parts per million TREO and 740 parts per million MREO. The reserve should not be presented as proof of a confirmed 40-year operating life.
What is the 97-million-tonne premium-feed inventory?
Viridis has identified approximately 97 million tonnes grading above 4,000 ppm TREO and above 1,000 ppm MREO. The company intends to use this higher-grade material to support early production and the project-debt case.
What does the pre-feasibility study model?
The July 2025 pre-feasibility study models a five-million-tonne annual processing plant and a 20-year mine plan using 98.5 million tonnes. It estimates average annual production of 9,448 tonnes of contained REO, including 3,518 tonnes of MREO.
How much MREC could Colossus produce?
The PFS equates approximately 189,000 tonnes of life-of-mine rare earth oxide production with approximately 266,000 tonnes of mixed rare earth carbonate. That corresponds to approximately 13,300 tonnes of MREC per year on average and roughly 15,700 tonnes per year during years six to ten.
How much will the Colossus project cost?
The full PFS reports USD 286 million before contingency and USD 358 million including a 25-percent contingency. A later Viridis financing announcement cited USD 356 million, while management later indicated a total financing requirement of approximately USD 360 million to USD 400 million depending on working-capital requirements.
Does Viridis have a binding agreement with Solvay?
No. Viridis and Solvay announced a non-binding letter of intent in June 2026. Viridis said it was targeting a definitive agreement by the end of July 2026.
What environmental concerns have been raised?
Brazil’s Federal Public Prosecutor raised questions about springs, groundwater, the alkaline aquifer, nitrate contamination, processed clay, cumulative regional impacts and whether licensing belongs at federal rather than state level. Viridis disputes several claims and says only three of 98 mapped springs would be directly affected.
What is PL 500/2026?
PL 500/2026 proposes creating a National Rare-Earth Mineral Reserve around the Poços de Caldas alkaline complex. It would suspend specified pending rare-earth procedures in the designated area until the federal government defines special rules.
What is the radiological dispute?
A collective writ of mandamus argues that parts of the analysed material exceed the radiological exemption threshold. If the exemption were overturned, radiological regulation and potentially wider licensing oversight could move to the federal level.
How does Viridis differ from Serra Verde?
Serra Verde has produced mixed rare earth carbonate at Pela Ema in Goiás since 2024. Viridis remains a pre-production developer and still requires further permitting, financing, construction and commercial-scale commissioning.
