Jupiter Pilot Plant Delivers 14x Upgrade to 3% Concentrate
Released
Released
Announcement PDF
ASX Announcement
CRITICA LIMITED
Level 2, 16 Altona Street,
West Perth, Western
CRITICA LIMITED
Level 2, 16 Altona Street,
West Perth, Western
Australia ABN 51 119 678 385
T: +61 8 6279 9428
E: admin@critica.limited
critica.limited
Jupiter Pilot Plant Delivers ~14× Upgrade to ~3% TREO Concentrate,
Reinforcing Low-Cost Beneficiation Pathway
Critica Limited (ASX: CRI) (“Critica” or “the Company”) is pleased to announce a further significant
advance in the beneficiation pathway at its Jupiter Rare Earth Project, Australia's largest clay-hosted
rare earth resource, with pilot plant results upgrading feed material approximately 14× to an
intermediate concentrate grading ~3% TREO.
These results build on the beneficiation recovery improvements reported on 14 April 2026 and the
recently announced high-purity MREO production results, continuing the progression of Jupiter’s
beneficiation and downstream processing workstreams.
The latest results also confirm mass rejection of approximately 95%, concentrating the rare earth
minerals into ~5% of the original feed mass. By substantially reducing the volume of material
reporting to downstream processing, this supports lower projected operating and capital intensity
and feeds directly into the Scoping Study being progressed with Sedgman.
Highlights
• Pilot plant optimisation delivers intermediate concentrate grading ~3% TREO,
representing a ~14× upgrade from feed
• Higher-grade concentrate and ~95% mass rejection support reduced
downstream processing volumes, lower projected cost intensity and Critica's
continued transition from explorer to developer
• Approximately 95% mass rejection achieved, concentrating rare earth minerals
into ~5% of original feed mass
• Strong Magnet REE recoveries maintained, including:
o Nd₂O₃: 74.5%
o Dy₂O₃: 74.7%
o Pr₆O₁₁: 69.3%
o Tb₄O₇: 65.9%
• Results build on previously reported beneficiation and MREO testwork
• Results directly inform the Jupiter Scoping Study and advance the flowsheet
toward the next stage of development
27 May 2026 | ASX: CRI
ASX: CRI
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Critica’s CEO Jacob Deysel commented:
Following the previously reported beneficiation recovery improvements and recent advancement in
high-purity MREO production, ongoing pilot plant optimisation is now delivering materially higher-
grade intermediate concentrate from the same feed material.
Achieving an intermediate concentrate grading of approximately 3% TREO, representing a ~14×
upgrade and approximately 95% mass rejection, demonstrates continued progress in Jupiter’s
beneficiation pathway and the ability to significantly reduce downstream processing volumes.
Importantly, Magnet Rare Earth recoveries remain strong, with Nd and Dy recoveries both above
74%. Notwithstanding the size of the Jupiter resource, the significance of these results is not only
the upgrade achieved, but the quality and repeatability of the outcome. We are consistently
concentrating Magnet REEs into a materially reduced processing stream while maintaining strong
recoveries - exactly what a scalable and financeable flowsheet needs to demonstrate as we progress
Scoping Study work and product qualification.
Beneficiation Optimisation – Higher Grade Outcome
Recent testwork has delivered:
• Intermediate concentrate grading approximately 3% TREO
• Approximately 95% mass rejection
• Approximately 14× upgrade from feed to intermediate concentrate
• Strong Magnet REE recoveries maintained:
o Nd₂O₃: 74.5%
o Dy₂O₃: 74.7%
o Pr₆O₁₁: 69.3%
o Tb₄O₇: 65.9%
Ongoing optimisation targeting further concentrate grade improvement
These outcomes demonstrate improved beneficiation performance and support ongoing
optimisation of downstream processing pathways.
Additional bulk sample material is being processed to support continued optimisation and
downstream testwork, including production of MREO sample for product qualification.
Metallurgical Test Programmes
Metallurgical test programmes are continuing in parallel to assess downstream processing
pathways for the higher-grade intermediate concentrate.
Work remains focused on improving overall process performance and informing Sedgman’s
Scoping Study activities.
ASX: CRI
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Next Steps
• Continued optimisation of beneficiation and downstream processing pathways
• Production of additional higher-grade intermediate concentrate for downstream
testwork and product qualification
• Ongoing refinement of Scoping Study inputs and process configuration
• Production of final MREO product sample for qualification purposes.
Authorised by the Board of Critica Limited.
Jacob Deysel
CEO
Critica Limited
Level 2, 16 Altona Street, West Perth, Western Australia
T: + 61 8 6279 9428 | admin@critica.limited | critica.limited
Investor and Media Relations
Dannika Warburton
Investability Partners
investors@investability.com.au
JOIN CRITICA’S INTERACTIVE INVESTOR HUB
Sign up and engage with our investor relations team
Critica (ASX: CRI) is rapidly
advancing the Jupiter Project
in WA, Australia’s largest
clay-hosted rare earth
resource, with a mine-to-
magnet plan to meet
surging AI, EV, renewables
and defence demand.
ASX: CRI
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Competent Persons Statement
The information in this report that relates to exploration results including geology interpretation,
data preparation and data quality is based on work compiled by Dr. Stuart Owen who is a Member
of the Australian Institute of Geoscientists. Dr. Owen is a permanent employee of Critica Limited and
has sufficient experience that is relevant to the style of mineralisation and type of deposit under
consideration and to the activity which he is undertaking to qualify as Competent Person as defined
in the 2012 Edition of the Australasian Code for Reporting of Exploration Results, Mineral Resources
and Ore Reserves (JORC code). Dr. Owen consents to the inclusion in the report of the matters based
on his information in the form and context in which they appear.
The Information in this announcement that relates to previous exploration results for the Projects
is extracted from the following ASX announcements:
• Jupiter Pilot Plant Recovery Improves to 81% MagREO – 14 April 2026
Table 1 | Jupiter pilot REE beneficiation intitial test work results
Sample
Feed
grade
Concentrate
grade
Recovery %
Mass % 100 4.7
TREO ppm 2137 30029 66.1
Magnet REO ppm 496 7729 73.4
Heavy REO ppm 160 2290 67.3
La2O3 ppm 411 6013 68.9
CeO2 ppm 969 13149 63.8
Pr6O11 ppm 105 1549 69.3
Nd2O3 ppm 369 5840 74.5
Sm2O3 ppm 58 832 67.0
Eu2O3 ppm 12 167 64.9
Gd2O3 ppm 33 492 69.4
Tb4O7 ppm 4.0 56 65.9
Dy2O3 ppm 18 284 74.7
Ho2O3 ppm 3.0 44 69.5
Er2O3 ppm 7.3 95 61.8
Tm2O3 ppm 1.0 11 56.2
Yb2O3 ppm 5.1 65 59.2
Lu2O3 ppm 0.8 8 45.4
Y2O3 ppm 88 1235 66.3
Sc2O3 ppm 53 189 16.8
P2O5 % 0.96 11.6 56.8
Note
TREO represents the sum of 14 Rare Earth Elements excluding promethium plus yttrium expressed as oxides
Magnet REO represents the sum of neodymium, praseodymium, dysprosium and terbium expressed as oxides
Heavy REO represents the sum of the gadolinium, terbium, dysprosium, holmium, erbium, thulium, ytterbium, lutetium and yttrium
expressed as oxides
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Table 2 | Jupiter drill holes used for pilot beneficiation bulk sample
Hole East MGA50
GDA94
East MGA50
GDA94
RLm
AHD83
Hole
depth
m
Hole East
MGA50
GDA94
East
MGA50
GDA94
RLm
AHD83
Hole
depth
m
BRAC063 529494 6854087 350 55 BRRC018 530587 6852569 357 96
BRAC064 529000 6855102 348 66 BRRC046 527501 6850219 350 72
BRAC071 529741 6856997 355 41 BRRC047 526499 6850207 345 73
BRAC077 529994 6856599 352 39 BRRC061 530517 6857002 355 31
BRAC078 529744 6856606 353 67 BRRC064 530499 6855089 354 43
BRAC085 531750 6855605 357 55 BRRC068 530496 6853095 357 61
BRAC091 530253 6855601 352 66 BRRC080 528998 6853110 350 72
BRAC092 529996 6855601 351 88 JPAC003 529006 6857261 356 39
BRAC097 530750 6855099 354 62 JPAC004 529496 6857007 355 72
BRAC098 530247 6855091 353 45 JPAC005 529506 6856802 354 61
BRAC104 531501 6854598 359 54 JPAC009 529254 6856339 352 73
BRAC105 531249 6854600 358 69 JPAC028 529251 6854852 349 61
BRAC106 530998 6854600 357 63 JPAC029 529000 6854839 348 75
BRAC108 530500 6854601 355 67 JPAC030 528756 6854854 347 68
BRAC109 530249 6854598 354 62 JPAC032 527759 6855094 346 72
BRAC113 531747 6854096 361 64 JPAC034 527743 6854587 345 79
BRAC114 531247 6854103 359 82 JPAC038 528758 6854348 347 66
BRAC117 529750 6854103 351 63 JPAC059 526245 6853603 341 76
BRAC122 531249 6853597 360 66 JPAC062 529495 6853349 352 45
BRAC124 530746 6853600 357 46 JPAC063 529245 6853355 351 53
BRAC126 530242 6853597 355 47 JPAC072 526249 6853355 340 68
BRAC129 529746 6853598 352 56 JPAC073 529495 6852851 352 65
BRAC130 532246 6853100 366 66 JPAC074 529254 6852853 351 67
BRAC135 530245 6853099 355 48 JPAC077 527998 6852849 346 74
BRAC143 529996 6852600 355 67 JPAC078 527747 6852846 346 71
BRAC147 530248 6852102 356 71 JPAC081 526496 6852850 342 84
BRAC154 529496 6851596 354 78 JPAC083 525998 6852857 339 62
BRAC156 529499 6850605 357 72 JPAC085 529497 6852349 353 71
BRAC159 528749 6850601 352 73 JPAC094 525748 6852330 340 64
BRAC163 527743 6850602 349 66 JPAC105 527504 6851841 346 79
BRAC190 527249 6850191 348 65 JPAC118 527005 6851355 344 96
BRAC191 527751 6850195 351 63 JPAC130 524725 6850845 341 50
BRAC200 527249 6849800 350 53 JPAC131 525505 6850831 341 62
BRAC210 526254 6851101 343 66 JPAC140 528994 6850856 353 67
BRAC215 524254 6851101 340 44 JPAC164 528504 6849995 354 75
BRAC225 526004 6851603 341 70 JPAC165 528254 6849997 353 67
BRAC226 526250 6851602 341 69 JPAC188 530493 6852846 357 70
BRAC229 527002 6851598 344 57 JPAC190 530010 6852851 355 60
BRAC233 528000 6851600 348 99 JPAC202 531243 6853841 359 87
BRAC234 528250 6851609 349 86 JPAC203 530994 6853855 358 71
BRAC235 528496 6851602 349 94 JPAC205 530490 6853850 355 84
BRAC236 528744 6851602 350 69 JPAC209 531250 6854344 358 82
BRAC240 527752 6852095 346 87 JPAC210 530994 6854346 357 88
BRAC241 527256 6852093 345 89 JPAC217 531002 6854847 356 57
BRAC255 527498 6852604 345 68 JPAC220 530249 6854846 354 71
BRAC258 526742 6852603 343 84 JPAC221 529995 6854838 352 66
BRAC268 527750 6853104 345 80 JPAC225 530497 6855347 353 65
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Hole East MGA50
GDA94
East MGA50
GDA94
RLm
AHD8
3
Hole
depth
m
Hole East
MGA50
GDA94
East
MGA50
GDA94
RLm
AHD8
3
Hole
dept
h m
BRAC272 525999 6853105 340 70 JPAC226 530247 6855340 353 73
BRAC285 526755 6853599 342 75 JPAC227 529998 6855350 352 48
BRAC287 528753 6854099 348 54 JPAC229 531245 6855845 355 61
BRAC293 529006 6854602 348 72 JPAC233 530252 6855851 352 53
BRAC294 528750 6854596 347 87 JPAC239 530310 6855603 352 59
BRAC297 527997 6854599 346 73 JPAC240 530203 6855592 352 62
BRAC298 529249 6855097 349 95 JPAC241 530154 6855596 352 55
BRAC299 528752 6855099 348 69 JPAC243 530048 6855596 352 78
BRAC301 529249 6855602 349 53 JPAC245 529899 6855610 351 61
BRAC307 529253 6856101 351 63 JPAC255 530482 6856794 354 35
BRRC011 529547 6853247 352 84 JPAC257 529989 6856792 353 65
BRRC017 530174 6852566 355 90
7
APPENDIX ONE: JORC CODE, 2012 EDITION | ‘TABLE 1’ REPORT
Section 1 Sampling Techniques and Data
(Criteria in this section apply to all succeeding sections)
Criteria JORC Code explanation Commentary
Table
Sampling
techniques
• Nature and quality of sampling (e.g.: cut
channels, random chips, or specific specialised
industry standard measurement tools
appropriate to the minerals under investigation,
such as down hole gamma sondes, or handheld
XRF instruments, etc.). These examples should
not be taken as limiting the broad meaning of
sampling.
• Measures taken to ensure sample representivity
and the appropriate calibration of any
measurement tools or systems used.
• Aspects of the determination of mineralisation
that are Material to the Public Report. In cases
where ‘industry standard’ work has been done
this would be relatively simple (e.g.: ‘reverse
circulation drilling was used to obtain 1 m
samples from which 3 kg was pulverised to
produce a 30 g charge for fire assay’). In other
cases more explanation may be required, such
as where there is coarse gold that has inherent
sampling problems. Unusual commodities or
mineralisation types (e.g.: submarine nodules)
may warrant disclosure of detailed information.
• The Jupiter metallurgical composite tested by
GAVAQ laboratory was selected from 117
Reverse Circulation (RC) and Air Core (AC)
exploration and resource definition drill holes
within the Jupiter resource as listed in Table 2.
• The pilot metallurgical composite comprised a
blend of regolith material types representative of
the Jupiter resource, grades as previously
announced to the ASX.
• Sampling was supervised by a suitably
qualified Critica geologist.
Drilling
techniques
• Drill type (e.g.: core, reverse circulation, open-
hole hammer, rotary air blast, auger, Bangka,
sonic, etc..) and details (e.g.: 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..).
• This metallurgical composite sample subject
of this report was selected from seven 117 RC
and AC holes drilled by DB450 and KL150 AC
drill rigs operated by KTE Mining Services Pty
Ltd.
• Holes were drilled to blade refusal in near
fresh rock (saprock).
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.
• The bulk RC and AC samples were visually
assessed, weighed and considered
representative with overall good recovery.
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.
• All holes were qualitatively geologically
logged by suitably qualified Critica geologists.
• The detail of geological logging is considered
sufficient for exploration and resource
definition drilling.
• A JORC compliant Inferred Resource for the
Jupiter clay -hosted REE deposit has been
previously announced to the ASX (Critica
announcement to the ASX 11 February 2025).
•
Sub-sampling
techniques and
sample
preparation
• 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 representivity of
samples.
• Measures taken to ensure that the sampling is
representative of the in situ material collected,
including for instance results for field
• The metallurgical composite covered 1,712 m
from the 117 listed drill holes
• Intervals selected from each drill hole ranged
from 4 to 40 m and were collected by
sampling spear from the bulk 1 m sample
bags, then homogenized, weighed and
dispatched to the GAVAQ pilot plant in Hai
Phong, Vietnam.
• Total composite sample supplied for piloting
test work was c. 3.7 tonnes
8
Criteria JORC Code explanation Commentary
duplicate/second-half sampling.
• Whether sample sizes are appropriate to the
grain size of the material being sampled.
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
levels of accuracy (ie lack of bias) and precision
have been established.
• Assaying of the metallurgical composite and
products was conducted by ALS
Geochemistry, Perth WA
• The rare earth elements were determined by
lithium borate fusion followed by acid
digestion of the resultant glass bead and ICP-
MS finish, Fe, P and other reported major
elements were determined by XRF on fused
glass disks.
• Suitable certified REE standards were
included and reported within the expected
ranges
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.
• The use of twinned holes is not applicable at
this stage.
• The metallurgical results are compatible with
observed mineralogy.
• Primary data is stored and documented in
industry standard ways.
• Assay data was as reported by ALS
geochemistry and has not been adjusted in
any way.
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.
• Drill hole locations were determined by
handheld GPS with a nominal accuracy of +/-
5 metres.
• All coordinates and maps presented here are
in the MGA Zone 50 GDA94 system.
• Topographic control is provided by Worldwide
3 arc second SRTM spot height data.
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.
• The drill holes selected for the GAVAQ pilot
metallurgical composite were part of Jupiter
exploration and resource definition programs
and within the Jupiter clay-hosted REE
Inferred Resource as previously reported to
the ASX.
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.
• The RC and AC holes were drilled vertically
along E-W drill lines
• The intersected clay and saprolite zones
blanket weathered syenite-monzonite
basement such that downhole thickness
approximates true thickness.
Sample security • The measures taken to ensure sample security. • The chain of custody for the metallurgical
composite from collection to dispatch to
GAVAQ was managed by Critica personnel.
and the level of security is considered
appropriate.
Audits or reviews • The results of any audits or reviews of sampling
techniques and data.
• Mass balances and GAVAQ test work was
monitored and reviewed by suitably qualified
Critica Limited’s Chief Metallurgist Dr Dinh
Hien.
9
Section 2 Reporting of Exploration Results
(Criteria listed in the preceding section also apply to this section)
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 Brothers REE Project currently consists of granted
Exploration Licences E59/2421, E59/2463, E59/2710,
E59/2711, E59/2819, E59/2821, E59/2827, E59/2889,
E59/2890, E59/2907, E59/2927, E59/2928, E59/2930,
E59/2977 and E58/629. All are 100% held by
Tasmanian Rare Earth Pty Ltd a wholly owned
subsidiary of Critica Limited.
Exploration done
by other parties
• Acknowledgment and appraisal of
exploration by other parties.
• Documented previous explorers within the area now
covered by the Brothers Project include North Flinders
Mines Ltd, CRA Exploration Pty Ltd, Spark Energy Pty
Ltd, Arcadia Minerals Ltd, Babalya Gold Pty Ltd,
Burmine Ltd, Equigold NL, Equinox Resources NL,
Jervois Mining Ltd, Minjar Gold Pty Ltd, Mount Magnet
South NL, Sons of Gwalia Ltd and David Ross.
• Refer to previous Critica announcements to the ASX
and also available from http://critica.limited
Geology • Deposit type, geological setting and
style of mineralisation.
• The Brothers REE exploration area is situated within the
Western Australian Archean Yilgarn Craton and mostly
comprises Cenozoic cover sequence overlying an
extensive Archaean monzogranite complex (the Big Bell
Suite).
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 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.
• Locations and composited intervals for the GAVAQ
metallurgical composite are as listed below: All holes
were vertical and collar location was determined by
handheld Garmin GPS64sx considered accurate to
±5m.
• All coordinates and maps presented here are in the
MGA Zone 50 GDA94 system.
• Topographic control is provided by Worldwide 3 arc
second SRTM spot height data.
• Refer to previous ASX announcements for relevant
intersections and assay results.
Data aggregation
methods
• In reporting Exploration Results,
weighting averaging techniques,
maximum and/or minimum grade
truncations (e.g. 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.
• Metal equivalents have not been applied.
• Refer to previous ASX announcements for relevant
Jupiter project intersections and assay results.
• Standard element to oxide conversion factors have
been used and TREO was calculated on an unrounded
basis.
10
Criteria JORC Code explanation Commentary
Relationship
between
mineralisation
widths and
intercept 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
(e.g. ‘down hole length, true width not
known’).
• The intersected clay and saprolite zones blanket
weathered granitoid basement such that downhole
thickness approximate true thickness.
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.
• Appropriate project location maps are included in this
release.
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.
• Refer to previous ASX announcements (also available
from http://critica.limited) for relevant Jupiter project
intersections and assay results.
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.
• GAVAQ Solutions, Vietnam was engaged by Critica
Limited to undertake pilot beneficiation test work on c.
3.7 tonne blend representing the Jupiter clay-hosted
REE mineralization as selected by Critica Limited’s
geometallurgist.
• The head grade of the composite sample as supplied
and determined by ALS Geochemistry was 0.21%
TREO.
• GAVAQ conducted particle size analysis, multi-
element geochemistry, XRD mineralogy, and gravity
and magnetic separation work to identify potential
process flowsheets.
• The process flowsheet used to produce the results
reported here comprised grinding to 100% passing 0.2
mm, scrubbing (attrition), then low intensity (800
gauss) magnetic separation to remove the magnetic
iron minerals (mainly hematite and magnetite). The
non-magnetic fraction was then subject to an open
circuit flotation test using combined carboxylate and
amine collectors, sodium silicate depressant and
dextrin dispersant at selected pH and ambient
temperatures.
• Assaying of resultant metallurgical fractions was
conducted at ALS Geochemistry, Perth WA as
described above.
• Feed and beneficiated grades and recoveries for the
elements of interest are given in Table 1 of this
announcement.
• XRD shows hydrated phosphates including
rhabdophane and gorceixite to be the main REE
phases, and magnetite and hematite the main
magnetic iron phases
Further work • The nature and scale of planned further
work (e.g. 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.
• Critica is currently conducting ongoing mineralogy and
metallurgical test work, including upgrading of REEs via
physical rejection of quartz, feldspar and iron oxides
(including potential by-products), other flotation
collectors and conditions, closed circuit flotation, and
leach testing.
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