Ema REE Environmental Restoration Breakthrough
Released
Released
Announcement PDF
ASX Announcement
Released 20th
October 2025
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Brazilian Critical Minerals Ltd (ABN: 82 089 221 634)
AUS: Level 28, 140 St Georges Terrace, Perth WA 6000 T +61 8 6383 7820
BRA: MINERAÇÃO BBX DO BRASIL LTDA, Rua dos Inconfidentes n⁰ 867, Savassi, Belo Horizonte, Minas Gerais, CEP 30.140-128
Page | 1
EMA REE PROJECT ACHIEVES BREAKTHROUGH IN
ENVIRONMENTAL RESTORATION
Washing following ISR has successfully re-balanced the clay chemistry,
returning the system to its natural, pre-leach conditions
Highlights
• Successful return of pH to baseline values after in-situ leaching (ISR) field trial
operation reaching a key environmental and regulatory milestone
• Magnesium reduced to natural background levels following controlled water
washing
• Aluminium and Iron concentrations reduced to zero levels
• >90% recovery of magnesium ions allowing for lixiviant recycling and recovery
reducing operating costs
• Sulphur values in the form of sulphate (SO4) show no net accumulation in the
residual clays
• Clays successfully neutralised and stabilised post leaching confirms the ability to
return the clays pH, conductivity, and ion balance back to baseline levels
• Completion of the restoration phase marks the final stage of field trials, delivering
positive results that support regulatory approvals and advance the Ema ISR
project
Brazilian Critical Minerals Limited (ASX: BCM) (“BCM” or the “Company”) is pleased to report successful
clay restoration results from the water flushing phase of the in-situ recovery (ISR) field trials at the Ema
Project in Brazil. The outcomes confirm that clays can be neutralised and stabilised post-leaching,
representing a key environmental milestone that supports the project’s pathway to regulatory approvals
and near-term rare-earth production.
To view the video of MD, Andrew Reid, discussing this announcement, click on the link below
https://braziliancriticalminerals.com/link/PZ3R7y
ASX Announcement
Released 20th
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Brazilian Critical Minerals Ltd (ABN: 82 089 221 634)
AUS: Level 28, 140 St Georges Terrace, Perth WA 6000 T +61 8 6383 7820
BRA: MINERAÇÃO BBX DO BRASIL LTDA, Rua dos Inconfidentes n⁰ 867, Savassi, Belo Horizonte, Minas Gerais, CEP 30.140-128
Page | 2
Figure 1. pH measurement values from restoration phase. Water solution extracted from monitoring
holes H2F10, H2F11 and H2F12. Local river water at approximately pH7 was injected into the clays
during the restoration phase.
Andrew Reid, Managing Director, commented:
“BCM has now completed the entire ISR process in the field over the last several months. Early results
from our field trials during the water washing (or restoration) phase confirm that the pH, chemistry, and
equilibrium of the mineralised clays can be effectively restored. These outcomes are exactly what we
had anticipated.
Iron and aluminium concentrations dropped rapidly to zero once the controlled flushing program
commenced. The process is also highly effective at removing and reducing sulphur in the form of
sulphate to low levels whilst magnesium levels have fallen to near-zero values, now matching pre-
leaching baseline grades.
Not only have we now proven that we can not only remove residual ions but also prevent their migration
beyond the in-situ leaching perimeter.
Restoration of the clays is a critical step in our ISR workflow. A well-managed restoration phase
demonstrates responsible mining practice and plays a central role in permitting, ESG reporting, and
community engagement — underscoring the company’s commitment to environmental protection and
long-term stewardship.”
Comments on Results
The water washing or restoration phase is a critical stage in the in-situ recovery (ISR) process, ensuring
the operation meets high environmental standards and avoids any potential liabilities. The process
gradually re-equilibrates the clay chemistry, allowing natural geochemical reactions to stabilize the
formation and restore baseline conditions.
ASX Announcement
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BRA: MINERAÇÃO BBX DO BRASIL LTDA, Rua dos Inconfidentes n⁰ 867, Savassi, Belo Horizonte, Minas Gerais, CEP 30.140-128
Page | 3
Following leaching, the mineralised clays still contain residual lixiviant, with primary constituents of
magnesium (added as part of the leaching process) and aluminium (naturally leached from the clays)
and sulphur. Without proper flushing, these constituents can remain elevated in the clays, potentially
affecting clay chemistry.
Magnesium being the principal leaching agent of MgSO4, its recovery and recycling provide several key
benefits:
• Cost reduction: Magnesium salts can be expensive. Recovering and reusing them significantly
reduces reagent costs
• Efficiency improvement: Recovered magnesium can be reinjected to continue the leaching
process or maintain the desired chemical conditions, reducing the need for fresh chemicals and
keeping reagent usage efficient
• Environmental benefits: Less fresh MgSO₄ means fewer chemicals remain in the clays
Figure 2. Field pilot trial extraction and monitoring holes H2F10, H2F11, H2F12 showing magnesium
values over time post the commencement of water washing. Gaps in data collection represent non
field workdays (no water injection).
Figure 2 shows the rapid reduction of Mg values to the point where on 17 September (4 weeks after
commencement) the laboratory values were approaching laboratory equipment detection levels
reporting zero levels for both aluminium and iron. Importantly, Mg decline shows the cation phase of
the lixiviant has been flushed or precipitated whilst Al decline (Figure 3) is important because Al can be
mobile in low-pH conditions and its reduction is a positive sign that any potential acidifying effects have
been neutralized.
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Page | 4
Laboratory leach and post-wash analyses show no net sulphur accumulation in the residual clays
(table1). Sulphur introduced during leaching in the form of sulphate (SO₄) is effectively removed through
water washing, restoring sulphur concentrations to below pre-leach baseline levels.
Total sulphur levels averaging 0.01% (table 1.) is an order of magnitude below the commonly accepted
threshold of concern for acid mine drainage generation (typically >0.3% sulphur). At such low
concentrations, the acid generation potential is negligible as sulphur is not in the form of sulphides.
These results confirm that the material is non-acid forming (NAF) and poses no risk of acid mine drainage
or associated environmental impacts.
Figure 3. Field pilot trial extraction and monitoring holes H2F10, H2F11, H2F12 showing aluminium
values over time post the commencement of water washing. Gaps in data collection represent non
field workdays (no water injection).
Table 1. Laboratory values of field trial ISR samples analysed for magnesium, aluminium and iron as of
17 September 2025. Water washing commenced on 14August 2025. Sulphur samples and analysis taken
from a master composite sample (ASX: 7 May 2024) were tested in Brazil.
Hole ID Magnesium (%) Aluminium (%) Iron (%)
H2F10 0.00009 0 0
H2F11 0.0012 0 0
H2F12 0.0035 0 0
Samp ID Sulphur %
MS 1 sulphur content pre ISR column leaching 0.03
MS 2 sulphur content post ISR column leaching 0.01
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Page | 5
Hole H2F12 being the furthest away from the injection holes takes longer to register a response and
therefore stabilise the clays (Figure 4).
It is important to note that the proposed Ema ISR project intends to leach rare earth clays and collect
the PLS solution from topographic highs (hills) only and therefore all leaching activities are well above
the current known levels of the regional water table. Water in the region is used for livestock watering,
but is not used for community supply, irrigation or any other industrial use.
Figure 4. Field pilot trial and setup showing distribution of monitoring holes H2-F10, H2-F11, H2-
F12. Rings indicate approximate area of leaching influencing grades received from the PLS, with
H2-F10 being the smallest leaching area.
This announcement has been authorised for release by the Board of Directors.
Enquiries
For more information please contact:
Andrew Reid
Managing Director
Brazilian Critical Minerals Limited
Andrew.reid@braziliancriticalminerals.com
ASX Announcement
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Brazilian Critical Minerals Ltd (ABN: 82 089 221 634)
AUS: Level 28, 140 St Georges Terrace, Perth WA 6000 T +61 8 6383 7820
BRA: MINERAÇÃO BBX DO BRASIL LTDA, Rua dos Inconfidentes n⁰ 867, Savassi, Belo Horizonte, Minas Gerais, CEP 30.140-128
Page | 6
Brazilian Critical Minerals Limited (BCM) is a mineral
exploration company listed on the Australian
Securities Exchange.
Its major exploration focus is Brazil, in the Apuí
region, where BCM has discovered a world class Ionic
Adsorbed Clay (IAC) Rare Earth Elements deposit. The
Ema IAC project is contained within the 781 km² of
exploration tenements within the Colider Group and
adjacent sediments.
BCM has defined an indicated and inferred MRE of
943Mt of REE’s with metallurgical recoveries
averaging 68% MREO, representing some of the
highest for these types of deposits anywhere in the
world.
The Company has commenced a bankable feasibility
study due for completion in Q1 2026, is engaging
with regulators regarding permitting approvals and
has commenced a resource extension drilling
program which will inform the BFS economic analysis.
Ema REE Global Mineral Resource Estimate @COG 500ppm TREO
JORC
Category
cut-off
ppm TREO
Tonnes
Mt
TREO
ppm
NdPr
ppm
DyTb
ppm
MREO
ppm
MREO: TREO
%
Indicated 500 248 759 176 16 192 25
Inferred 500 695 701 165 16 181 26
Total 500 943 716 168 16 184 26
The information in this announcement relates to previously reported exploration results and mineral
resource estimates for the Ema Project released by the Company to ASX on 22 May 2023, 17 July 2023,
19 July 2023, 31 July 2023, 13 Sep 2023, 19 Oct 2023, 06 Dec 2023, 06 Feb 2024, 22 Feb 2024, 13 Mar
2024, 02 Apr 2024, 08 Oct 2024 19 Nov 2024, 21 Jan 2025, 17th
Feb 2025, 26th
Feb 2025, 10th
March
2025, 13th
March 2025, 28th
April 2025, 27th
May 2025, 28th
May, 13 June 2025, 01 July 2025, 18 August
2025, 01 Sep 2025 and 22 Sep 2025. The Company confirms that is not aware of any new information or
data that materially affects the information included in the above-mentioned releases and CONTINUES
TO APPLY and have not materially changed in accordance with listing Rule 5.23.2.
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Page | 7
Competent Person Statement
The information in this announcement that relates to exploration results is based on information
compiled by Mr. Antonio de Castro, BSc (Hons), MEMBER of AusIMM, CREA, who acts as BCM´s Senior
Consulting Geologist through the consultancy firm, ADC Geologia Ltda. Mr. de Castro has sufficient
experience which is relevant to the type of deposit under consideration and to the reporting of
exploration results and analytical and metallurgical test work to qualify as a competent person as
defined in the 2012 Edition of the Joint Ore Reserves Committee (JORC) “Australasian Code for Reporting
of Exploration Results, Mineral Resources and Ore Reserves”. Mr. Castro consents to the report being
issued in the form and context in which it appears.
Appendix 1: Table 1 Ema project – JORC Code (2012 Edition) metallurgical sampling techniques and data.
Item JORC code explanation Comments
Sampling Techniques
• Nature and quality of sampling.
• Include reference to measures taken to ensure sample
representativity and the appropriate calibration of any
measurement tools or systems used.
• Aspects of the determination of mineralisation that are Material
to the Public Report.
• Exploration results are based on solution samples
extracted during ISR field trials conducted by WSP with
support of BCM´s exploration team.
• The data presented is based on solution collected from
the monitoring holes after percolation through soils and
saprolite, mined by in-situ techniques.
• Sampling and measurements were supervised by the
Chief Metallurgist and WSP´s hydrogeologist.
• Sample was extracted from deep wells drilled down to
bedrock basement whereby solution was pumped to the
surface for collection and further analysis
• Solution samples were tested for pH with a probe called
Incoterm brand pen-type digital pH meter, after
calibration.
• Rare Earths + impurities were precipitated by the
addition of sodium carbonate.
• These results are specific for the tracer test area.
Drilling
Techniques
• Drill type (eg core. reverse circulation. open-
hole hammer. rotary air blast. auger. Bangka.
sonic. etc) and details (eg core diameter. triple
or standard tube. depth of diamond tails. face-
sampling bit or other type. whether core is
oriented and if so. by what method. etc).
• All auger holes in the test area were drilled with 6” bit.
• The deep injection holes in H2 area were the only ones
cased with 2” sliced PVC pipes, all others were cased with
sliced 4” PVC pipes.
• Coarse gravel sand was inserted between the pipes and
the edges of the holes to create the filter zone.
• Cement around the collars were built to prevent running
waters from rain to contaminate the underground water.
• Holes drilled are not included in any Mineral Resource
Estimation.
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Page | 8
Item JORC code explanation Comments
Drill Sample
Recovery
• Method of recording and assessing core and
chip sample recoveries and results assessed.
• Measures taken to maximise sample recovery
and ensure representative nature of the
samples.
• Whether a relationship exists between sample
recovery and grade and whether sample bias
may have occurred due to preferential loss/gain
of fine/coarse material.
• n/a. Not used in this technique.
Logging
• Whether core and chip samples have been
geologically and geotechnically logged to a level
of detail to support appropriate Mineral
Resource estimation. mining studies and
metallurgical studies.
• Whether logging is qualitative or quantitative in
nature. Core (or costean. channel. etc)
photography.
• The total length and percentage of the relevant
intersections logged.
• n/a. Not used in this technique.
Sub-
Sampling
Techniques
and
Sampling
Procedures
• If core. whether cut or sawn and whether
quarter. half or all core taken.
• If non-core. whether riffled. tube sampled.
rotary split. etc and whether sampled wet or
dry.
• For all sample types. the nature. quality and
appropriateness of the sample preparation
technique.
• Quality control procedures adopted for all sub-
sampling stages to maximise representativity of
samples.
• Measures taken to ensure that the sampling is
representative of the in-situ material collected.
including for instance results for field
duplicate/second-half sampling.
• Whether sample sizes are appropriate to the
grain size of the material being sampled.
• n/a. Not used in this technique.
Quality of
Assay Data
and
Laboratory
Tests
• The nature. quality and appropriateness of the
assaying and laboratory procedures used and
whether the technique is considered partial or
total.
• For geophysical tools. spectrometers. handheld
XRF instruments. etc. the parameters used in
determining the analysis including instrument
make and model. reading times. calibrations
factors applied and their derivation. etc.
• Nature of quality control procedures adopted
(eg standards. blanks. duplicates. external
laboratory checks) and whether acceptable
• The filtered solution samples were assayed using a Varian
ICP-OES instrument (model Vista MPX710), calibrated
using Specsol certified standards for each of the rare
earth elements. Quality control is conducted using a
standard reference sample previously prepared from
Ema mineralisation and assayed by SGS in Vaspasiano,
Brazil. The reference sample is read for each element
before and after running each assay batch. Any batches
in which the standard sample result plots outside two
standard deviations from the established value are re-
run.
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Page | 9
Item JORC code explanation Comments
levels of accuracy (ie lack of bias) and precision
have been established
• The assaying methodology is in line with industry
standard and is considered appropriate for rare earth
solutions. The technique is considered to be total.
Verification
of Sampling
and Assaying
• The verification of significant intersections by
either independent or alternative company
personnel.
• The use of twinned holes.
• Documentation of primary data. data entry
procedures. data verification. data storage
(physical and electronic) protocols.
• Discuss any adjustment to assay data.
• n/a. Not used in this technique.
Location of
Data Points
• Accuracy and quality of surveys used to locate
drill holes (collar and down-hole surveys).
trenches. mine workings and other locations
used in Mineral Resource estimation.
• Specification of the grid system used.
• Quality and adequacy of topographic control.
• The UTM WGS84 zone 21S grid datum is used for current
reporting. The drill holes collar locations were picked up
by a licensed surveyor using a Trimble total station (+/-
5cm), referenced to a government survey point.
Data Spacing
and
Distribution
• Data spacing for reporting of Exploration
Results.
• Whether the data spacing and distribution is
sufficient to establish the degree of geological
and grade continuity appropriate for the
Mineral Resource and Ore Reserve estimation
procedure(s) and classifications applied.
• Whether sample compositing has been applied.
• n/a. Not used in this technique.
Orientation
of Data in
relation to
Geological
Structure
• Whether the orientation of sampling achieves
unbiased sampling of possible structures and
the extent to which this is known. considering
the deposit type.
• If the relationship between the drilling
orientation and the orientation of key
mineralised structures is considered to have
introduced a sampling bias. this should be
assessed and reported if material.
• n/a. Not used in this technique.
Sample
security
• The measures taken to ensure sample security. • The solution samples sealed in plastic bags were sent
directly to Catalão by airfreight and courier to the
laboratory. The Company has no reason to believe that
sample security poses a material risk to the integrity of
the assay data.
Audit or
Reviews
• The results of any audits or reviews of sampling
techniques and data.
• The sampling techniques and data have been reviewed
by the Competent Person and are found to be of industry
standard.
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Page | 10
JORC (2012) Table 1 - Section 2: Reporting of Exploration Results
Criteria JORC code explanation Commentary
Mineral
Tenement and
Land Tenure
Status
• Type. reference name/number. location
and ownership including agreements or
material issues with third parties such as
joint ventures. partnerships. overriding
royalties. native title interests. historical
sites. wilderness or national park and
environmental settings.
• The security of the tenure held at the time
of reporting along with any known
impediments to obtaining a licence to
operate in the area.
• The EMA and EMA EAST leases are 100% owned
by BCM with no issues in respect to native title
interests. historical sites. wilderness or national
park and environmental settings.
• The company is not aware of any impediment to
obtain a licence to operate in the area.
Exploration
done by Other
Parties
• Acknowledgment and appraisal of
exploration by other parties.
• No exploration by other parties has been
conducted in the region.
Geology
• Deposit type. geological setting and style of
mineralisation.
• The REE mineralisation at EMA is contained within
the tropical lateritic weathering profile developed
on top of felsic rocks. rhyolites as per the Chinese
deposits.
• The REE mineralisation is concentrated in the
weathered profile where it has dissolved from the
primary mineral. such as monazite and xenotime.
then adsorbed on to the neo-forming fine
particles of aluminosilicate clays (e.g. kaolinite.
illite. smectite).
• This adsorbed iREE is the target for extraction and
production of REO.
Drill Hole
Information
• A summary of all information material to
the understanding of the exploration
results including a tabulation of the
following information for all Material drill
holes:
• easting and northing of the drill
hole collar
• elevation or RL (Reduced Level –
elevation above sea level in
metres) of the drill hole collar
• dip and azimuth of the hole
• down hole length and
interception depth
• hole length.
• If the exclusion of this information is
justified on the basis that the information
is not Material and this exclusion does not
detract from the understanding of the
report. the Competent Person should
clearly explain why this is the case.
• Auger locations and diagrams are presented in
this announcement.
• Details are tabulated in the announcement.
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Page | 11
Criteria JORC code explanation Commentary
Data
aggregation
methods
• In reporting Exploration Results. weighting
averaging techniques. maximum and/or
minimum grade truncations (eg. cutting of
high grades) and cut-off grades are usually
Material and should be stated.
• Where aggregate intercepts incorporate
short lengths of high-grade results and
longer lengths of low-grade results. the
procedure used for such aggregation
should be stated and some typical
examples of such aggregations should be
shown in detail.
• The assumptions used for any reporting of
metal equivalent values should be clearly
stated.
• REE grades reported refer to solution collected to
monitor the ISR process.
• No metal equivalent values are reported.
Relationship
between
mineralization
widths and
intercepted
lengths
• These relationships are particularly
important in the reporting of Exploration
Results.
• If the geometry of the mineralisation with
respect to the drill hole angle is known. its
nature should be reported.
• If it is not known and only the down hole
lengths are reported. there should be a
clear statement to this effect (eg ‘down
hole length. true width not known’).
• REE grades reported refer to solution collected to
monitor the ISR process.
• Mineralisation orientation is assumed to be flat.
Diagrams
• Appropriate maps and sections (with
scales) and tabulations of intercepts should
be included for any significant discovery
being reported These should include. but
not be limited to a plan view of drill hole
collar locations and appropriate sectional
views.
• Maps and tables of the auger hole’s location and
target location are inserted.
Balanced
reporting
• Where comprehensive reporting of all
Exploration Results is not practicable.
representative reporting of both low and
high grades and/or widths should be
practiced to avoid misleading reporting of
Exploration Results.
• REE grades reported refer to solution collected to
monitor the ISR process.
Other
substantive
exploration
data
• Other exploration data. if meaningful and
material. should be reported including (but
not limited to): geological observations;
geophysical survey results; geochemical
survey results; bulk samples – size and
method of treatment; metallurgical test
results; bulk density. groundwater.
geotechnical and rock characteristics;
potential deleterious or contaminating
substances.
• No other significant exploration data has been
acquired by the Company.
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Page | 12
Criteria JORC code explanation Commentary
Further Work
• The nature and scale of planned further
work (eg tests for lateral extensions or
depth extensions or large-scale step-out
drilling).
• Diagrams clearly highlighting the areas of
possible extensions. including the main
geological interpretations and future
drilling areas. provided this information is
not commercially sensitive.
• Additional metallurgical test work with
magnesium sulphate leach.
• Extraction of PLS for stream line precipitation and
impurity removals at ANSTO.
• Detail topography survey with LIDAR for mine
planning
• Geophysics survey, Electro resistivity to define
the saprolite/fresh rock boundary and faults in
the rock.
Appendix 2 – List of Drill Hole Collars
Hole ID East North RL (m) Depth(m) Azimuth Dip
TANKS 185682,99 9183028,31 146,27 na
HI01-F1 185670,65 9183034,56 144,36 10.0 0 -90
HI01-F2 185673,64 9183034,40 144,25 9.7 0 -90
HI01-F3 185676,63 9183034,13 144,40 9.3 0 -90
HI01-F4 185679,64 9183033,91 144,36 11.2 0 -90
HI01-F5 185682,60 9183033,81 144,55 11.5 0 -90
HI01-F6 185672,24 9183037,43 143,99 11.6 0 -90
HI01-F7 185675,16 9183037,22 143,81 11.4 0 -90
HI01-F8 185678,26 9183036,92 143,90 10.7 0 -90
HI01-F9 185681,29 9183036,74 143,67 10.0 0 -90
HI02-F1 185658,77 9183055,00 141,37 5.7 0 -90
HI02-F2 185660,73 9183054,87 141,58 5.7 0 -90
HI02-F3 185662,73 9183054,95 141,38 5.7 0 -90
HI02-F4 185658,75 9183057,06 141,16 5.7 0 -90
HI02-F5 185660,59 9183056,71 141,08 5.7 0 -90
HI02-F6 185662,62 9183056,84 141,21 5.7 0 -90
HI02-F7 185658,54 9183059,01 140,83 5.7 0 -90
HI02-F8 185660,56 9183058,92 140,69 5.7 0 -90
HI02-F9 185662,53 9183058,74 140,80 5.7 0 -90
HI02-F10 185659,77 9183057,94 140,82 12.0 0 -90
HI02-F11 185659,62 9183060,83 140,37 12.0 0 -90
HI02-F12 185659,51 9183062,82 140,09 12.0 0 -90
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