Critica Commences Bulk Metallurgical Testwork
Released
Released
Announcement PDF
28 May 2025
ASX: CRI
CRITICA COMMENCES BULK METALLURGICAL
TESTWORK
The Board of Critica Limited (Critica or the Company) is pleased to advise that following on from successful initial
beneficiation work that achieved a better than 9x Rare Earth Element (REE) upgrade1, the Company has dispatched a
400 kg bulk sample from the Jupiter Deposit to the Centre of Science and Technology of Minerals and Environment
(CSTME), Vietnam. CSTME will use the bulk sample to refine the beneficiation processes and produce material for
initial leach test work.
Critica is also pleased to announce that it continues to receive support from Curtin University’s Resources
Technology and Critical Minerals Trailblazer program. Under this scheme, the Company will be submitting a second
bulk sample to the WA School of Mines (Curtin University) to produce additional beneficiated material for future
leach test work.
Critica highlights that the Jupiter Deposit includes over 280,000 tonnes of contained Heavy Rare Earth Elements
(refer Table 1) and the Company is committed to work focussing on the key HREE zones. The realisation of a 64 %
Iron by-product (refer Table 3) via Wet Low Intensity Magnetic Separation (as part of the REE beneficiation process in
CSTME’s initial test work) also demonstrates the potential for by-product opportuntities from Jupiter. Critica will
continue to assess and refine these opportunities as part of the REE bulk sample test programs.
Table 1: Heavy Rare Earths in Jupiter Inferred Resource subject to China’s new export control laws.
JUPITER GLOBAL
INFERRED RESOURCE
JUPITER HIGH GRADE
RESOURCE (included)
1.782 BT @ 1651 ppm TREO
520 MT @ 2169 ppm TREO
(1,000 ppm cutoff)
(1,800 ppm cutoff)
Samarium (Sm2O3)
Tonnes
73,062
Tonnes
27,560
Gadolinium (Gd2O3)
44,550
16,120
Terbium (Tb4O7)
5,346
2,080
Dysprosium (Dy2O3)
24,948
9,360
Lutetium (Lu2O3)
1,782
520
Yttrium (Y2O3)
131,868
46,800
RESTRICTED
RARE EARTHS
Included in Jupiter Resource
Refer to ASX Announcement 11 February 2025 for full details of resource. Individual REE tonnes are calculated (Tonnage x Grade).
The rare earth export controls were announced in early April 2025 by China as a response to the US tariff trade war,
with new controls targeting seven REE’s including the Heavy Rare Earths which Jupiter contains.
The Company looks forward to providing further updates as metallurgical test work advances on its flagship 1.8 billion
tonne2 Jupiter Deposit. Jupiter is already Australia’s largest and highest grade clay hosted Rare Earth deposit and is
expected to see further resource growth as reconnaissance drilling tests numerous satellite targets within the
province-scale Brothers REE Project.
1
Refer to ASX Announcement 23 January 2025
2
Refer to Table 1 and ASX Announcement 11 February 2025
CRITICA LIMITED Level 2, 16 Altona Street, West Perth, Western Australia
ABN 51 119 678 385 | T: +61 8 6279 9428 | F: +61 8 6500 9986 | admin@critica.limited | www.critica.limited
1
28 May 2025
ASX: CRI
Authorised by the Board of Critica Limited.
Stuart Owen
Interim CEO
JOIN CRITICA’S INTERACTIVE INVESTOR HUB
Visit Critica Limited’s InvestorHub to sign up and engage with the Team
CONTACT US
Critica Limited
Level 2, 16 Altona Street, West Perth, Western Australia
T: + 61 8 6279 9428 | admin@critica.limited | www.critica.limited
CRITICA LIMITED Level 2, 16 Altona Street, West Perth, Western Australia
ABN 51 119 678 385 | T: +61 8 6279 9428 | F: +61 8 6500 9986 | admin@critica.limited | www.critica.limited
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28 May 2025
ASX: CRI
Figure 1 | Jupiter Deposit and Brothers REE Project location map
CRITICA LIMITED Level 2, 16 Altona Street, West Perth, Western Australia
ABN 51 119 678 385 | T: +61 8 6279 9428 | F: +61 8 6500 9986 | admin@critica.limited | www.critica.limited
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28 May 2025
ASX: CRI
Figure 2 | Jupiter Deposit and satellite clay-hosted REE targets within the Brothers Project
CRITICA LIMITED Level 2, 16 Altona Street, West Perth, Western Australia
ABN 51 119 678 385 | T: +61 8 6279 9428 | F: +61 8 6500 9986 | admin@critica.limited | www.critica.limited
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28 May 2025
ASX: CRI
ABOUT CRITICA
Project Overview
• the Jupiter deposit is situated in Yalgoo, Western Australia, approximately 250 km east of Geraldton and accessible
by sealed road.
• The initial discovery was announced in late 2023, and comprises of clay-hosted rare earth mineralisation.
• In February 2025, Critica announced a global inferred resource of 1.8 BT at 1,700 ppm, including 520 MT at 2,200
ppm Total Rare Earth Oxides. Jupiter is currently Australia’s largest and highest-grade clay-hosted Rare Earth
deposit.
• The Jupiter deposit contains 682 kilotonnes (kt) of Magnet Rare Earth Oxides (MREO) within the global resource.
• The deposit contains low levels of Thorium and Uranium.
.
Strategic Advantages
• Infrastructure: The project benefits from existing mining precinct infrastructure, including proximity to the
Geraldton-Mount Magnet highway and the mid-west gas pipeline.
• Accessibility: The flat-lying terrain and pastoral leases ensure year-round access.
• Nearby Facilities: The project is close to rare earth processing facilities, such as Lynas Rare Earths'
concentrator at Mount Weld and Iluka Resources' planned facility at Eneabba.
COMPETENT PERSONS STATEMENT – EXPLORATION RESULTS
The information in this report that relates to Exploration Results and Exploration Targets is based on information 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. 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:
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
Drill Targets Restricted Heavy REE at Satellite Prospects – 5 May 2025
First Pass Metallurgical Testwork Delivers 830% REE Upgrade – 23 January 2025
Jupiter Project Update – 19 December 2024
Excellent High-Grade Continuity at Jupiter and Mineral Resource Estimate Underway – 27 November 2024
Best Intersection – 67m @ 3,074ppm TREO from Latest Jupiter Drilling – 6 November 2024
Multiple Rare Earth Discoveries Near Jupiter – 17 October 2024
New Rare Earth Discovery Jupiter Satellite – 17 September 2024
Another Record Drilling Result – 57m @ 3,430ppm TREO – 17 July 2024
Best Drill Intersection to date – 58m @ 2,723ppm TREO – 17 June 2024
8m @ 5,716ppm TREO- Jupiter Drilling Continues to Outperform – 5 June 2024
Drilling Delivers More Record REE Intersections at Jupiter – 23 May 2024
Jupiter-more outstanding REE hits up to 60 m over 2000 ppm – 16 April 2024
Strategic Acquisition Adjacent to Jupiter REE Discovery – 22 March 2024
300 Drillhole Program Commences at Jupiter – 15 March 2024
Jupiter Continues to Deliver with Record NdPr over 5,000 ppm – 8 March 2024
Jupiter delivers record drill hit of 48 m @ 3,025 ppm TREO – 9 February 2024
Jupiter Delivers over 7,000 ppm TREO from Maiden RC Drilling – 29 November 2023
Massive new REE Target at Brothers with up to 3,969 ppm TREO – 9 November 2023
VMS makes High Grade clay hosted REE discover at Brothers – 1 August 2023
Venture set to drill at the Iron Duke High Grade REE Project –18 May 2023
JV into Neighbouring REE project with 49m @ 1313ppm TREO – 9 May 2023
CRITICA LIMITED Level 2, 16 Altona Street, West Perth, Western Australia
ABN 51 119 678 385 | T: +61 8 6279 9428 | F: +61 8 6500 9986 | admin@critica.limited | www.critica.limited
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28 May 2025
ASX: CRI
ESTIMATION AND REPORTING OF MINERAL RESOURCES – JUPITER PROJECT
No new Mineral Resource information is contained in this report. Information in this report which refers to Mineral Resources for the Jupiter
Project in Western Australia is taken from the company’s initial ASX disclosure dated 11 February 2025 “Jupiter Maiden Resource:
Australia’s Largest and Highest Grade Clay Hosted Rare Earth Resource”, found at www.critica.limited. The disclosure fairly represents
information compiled by Mr Rodney Brown a Member of Australian Institute of Mining and Metallurgy and is an employee of SRK
Consulting (Australia) Pty Ltd, independent of Critica Limited and has no conflict of interest.
The Company confirms that all material assumptions and technical parameters underpinning the Mineral Resources Estimates referred to
within previous ASX announcements remain current and have not materially changed since last reported. The Company is not aware of any
new information or data that materially affects the information included in this announcement.
The Company confirms that the form and context in which the Competent Person's findings are or were presented have not been
materially modified.
Notes:
1.TREO represents the sum of 14 Rare Earth Elements excluding Promethium plus Yttrium expressed as oxides.
2.MREO represents the sum of the Neodymium, Praseodymium, Dysprosium and Terbium expressed as oxide
Glossary
RE – Rare Earth(s)
REE – Rare Earth Elements
TREO – Total Rare Earth Oxides including yttrium
MREO – Magnet Rare Earth Oxides
CRITICA LIMITED Level 2, 16 Altona Street, West Perth, Western Australia
ABN 51 119 678 385 | T: +61 8 6279 9428 | F: +61 8 6500 9986 | admin@critica.limited | www.critica.limited
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ASX: CRI
APPENDIX A – JORC CODE (2012 EDITION) TABLE
Table 2 | Jupiter Inferred Mineral Resource Estimate – ASX Announcement 11 February 2025
Cut-off
Tonnage TREO
MREO
La2O3
CeO2 Pr6O11 Nd2O3 Sm2O3 Eu2O3 Gd2O3 Tb4O7 Dy2O3 Ho2O3 Er2O3 Tm2O3 Yb2O3 Lu2O3
Y2O3
TREO (ppm)
(Bt)
(ppm)
(ppm)
(ppm)
(ppm)
(ppm)
(ppm)
(ppm)
(ppm)
(ppm)
(ppm)
(ppm)
(ppm)
(ppm)
(ppm)
(ppm)
(ppm)
(ppm)
1,000
1.78
1,651
383
342
762
81
284
41
9
25
3
14
2
6
1
5
1
74
1,800
0.52
2,169
499
444
1,023
106
371
53
11
31
4
18
3
8
1
6
1
90
Based on 1,000 ppm and 1,800 ppm TREO lower cut-off grades
Table 3 | Jupiter 800 gauss magnetic concentrate by-product of CTSME REE beneficiation test work - ASX Announcement 23 February 2025
Fe %
Al2O3 %
SiO2 %
CaO %
K2O %
64.2
1.1
3
0.5
0.2
MgO %
MnO %
TiO2 %
P%
0.2
0.1
0.8
0.1
S%
<0.1
CRITICA LIMITED Level 2, 16 Altona Street, West Perth, Western Australia
ABN 51 119 678 385 | T: +61 8 6279 9428 | F: +61 8 6500 9986 | admin@critica.limited | www.critica.limited
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ASX: CRI
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.
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..).
•
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.
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.
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 subsampling 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
duplicate/second-half sampling.
Whether sample sizes are appropriate to the grain size
of the material being sampled.
•
The bulk AC samples were visually assessed,
weighed and considered representative with overall
good recovery.
•
All holes were qualitatively geologically logged by
suitably qualified Critica geologists.
Mineral Resources have not been estimated.
The detail of geological logging is considered
sufficient for exploration and resource definition
drilling.
•
•
Drilling techniques
Drill sample
recovery
•
•
•
•
Logging
•
•
•
Sub-sampling
techniques and
sample
preparation
•
•
•
•
•
•
•
•
•
•
•
•
The Jupiter metallurgical composite tested by GAVAQ,
Centre of Science and Technology of Minerals and
Environment was selected from the seven (7) AC
exploration and resource definition drill holes listed in
Section 2 below.
The selected intervals represent iron-rich clay and
saprolite zones, grades as previously announced to the
ASX.
Sampling was supervised by a suitably qualified
Critica geologist.
This metallurgical composite sample subject of this
report was selected from seven (7) AC holes drilled
with a KL 150 AC rig operated by KTE Mining Services
Pty Ltd.
The AC drilling was conducted with a 90mm blade
and holes were drilled to blade refusal in near fresh
rock.
•
The metallurgical composite covered 58 m from the
7 listed drill holes
•
Composited intervals within each drill hole ranged
from 2 to 20 m and were collected by sampling
spear from the bulk 1 m sample bags, then
homogenized by mat rolling, bagged and weighed
for supply to GAVAQ.
Total composite weight was c. 51 kg
•
CRITICA LIMITED Level 2, 16 Altona Street, West Perth, Western Australia
ABN 51 119 678 385 | T: +61 8 6279 9428 | F: +61 8 6500 9986 | admin@critica.limited | www.critica.limited
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ASX: CRI
Criteria
JORC Code explanation
Commentary
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 GAVAQ and the
Vietnam National Institute of Mining – Metallurgy
Science and Technology (VIMLUKI).
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.
•
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 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.
Critica assay and metallurgical data is as reported
by GAVAQ and has not been adjusted in any way.
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 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.
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 measures taken to ensure sample security.
•
The drill holes selected for the GAVAQ metallurgical
composite were part of Jupiter exploration and
resource definition programs as previously reported
to the ASX.
•
The 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.
•
The chain of custody for the metallurgical
composite from collection to submission to GAVAQ
was managed by Critica personnel. and the level of
security is considered appropriate.
The results of any audits or reviews of sampling
techniques and data.
•
The GAVAQ test work was monitored and reviewed
by suitably qualified Critica Limited’s Senior
Metallurgist Dr Dinh Hien.
•
•
Verification of
sampling and
assaying
•
•
•
•
Location of data
points
•
•
•
Data spacing and
distribution
Orientation of data
in relation to
geological
structure
•
•
•
•
•
Sample security
•
Audits or reviews
•
•
•
•
•
•
•
CRITICA LIMITED Level 2, 16 Altona Street, West Perth, Western Australia
ABN 51 119 678 385 | T: +61 8 6279 9428 | F: +61 8 6500 9986 | admin@critica.limited | www.critica.limited
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ASX: CRI
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
•
•
The Brothers REE Project currently consists of granted Exploration
Licences E59/2421, E59/2463, E59/2710, E59/2711, E59/2819,
E59/2820, E59/2821, E59/2827, E59/2889, E59/2890, E59/2907,
E59/2927, E59/2928, E59/2930, and applications E59/2929 and
E21/232. All are 100% held by Tasmanian Rare Earth Pty Ltd a wholly
owned subsidiary of Critica Limited.
•
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
•
Exploration done
by other parties
•
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.
Acknowledgment and appraisal of
exploration by other parties.
•
Geology
•
Deposit type, geological setting and
style of mineralisation.
•
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.
•
•
Hole
BRAC076
BRAC082
BRAC091
BRAC063
BRAC064
BRAC083
BRAC159
•
•
•
•
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
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).
Locations and composited intervals for the GAVAQ metallurgical
composite are as listed below:
•
•
•
East MGA Zone
50 GDA94
530244
530247
530253
529494
529000
529745
528749
North MGA Zone
50 GDA94
6856602
6856107
6855601
6854087
6855102
6856102
6850601
Interval
12-16m
8-28m
16-24m
40-44m
42-44m
4-16m
48-56m
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.
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.
CRITICA LIMITED Level 2, 16 Altona Street, West Perth, Western Australia
ABN 51 119 678 385 | T: +61 8 6279 9428 | F: +61 8 6500 9986 | admin@critica.limited | www.critica.limited
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ASX: CRI
Criteria
Relationship
between
mineralisation
widths and
intercept lengths
JORC Code explanation
should be clearly stated.
•
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’).
Diagrams
•
Balanced
reporting
•
Other
substantive
exploration data
•
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.
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.
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.
Commentary
•
The intersected clay and saprolite zones blanket weathered granitoid
basement such that downhole thickness approximate true thickness.
•
Appropriate project location maps are included in this release.
•
Refer to previous ASX announcements for relevant Jupiter project
intersections and assay results.
•
GAVAQ Solution Metallurgical Equipment and Technology Consulting
Joint Stock Company, Hanoi, Vietnam was engaged by Critica Limited
to undertake beneficiation test work on a c. 51 kg composite of Jupiter
clay-hosted REE mineralization as selected by Critica Limited
geometallurgist.
The head grade of the composite sample as supplied and determined
by GAVAQ was 0.143% 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 nonmagnetic fraction was then subject to an open circuit flotation test
using combined carboxylate and amine collector, sodium silicate
depressant and dextrin dispersant at pH 8.5 and ambient
temperatures.
Open circuit flotation concentrate 1 returned 1.8 % TREO, 97% mass
reduction and 41% recovery from a feed grade of 1,430 ppm TREO.
Open circuit flotation combined concentrates 1 and 2 returned 1.3 %
TREO, 95 % mass reduction and 51 % recovery from a feed grade of
1.430 ppm TREO.
XRD shows hydrated phosphates including fluorapatite/rhabdophane
and gorceixite to be the main REE phases, and magnetite and
hematite the main magnetic iron phases
•
•
•
•
•
•
Fraction
Further work
•
The nature and scale of planned
•
•
Mass
%
TREO
%
TREO Mass
Recovery %
Fe %
Fe mass
recovery
%
800gauss magnetic
fraction
7.52
0.012
0.63
64.18
34.95
float concentrate 1
3.33
1.755
40.87
5.82
1.4
float concentrate 2
2.14
0.672
10.05
-
-
Middle
9.39
0.166
10.9
-
-
Tailings
77.61
0.069
37.54
-
-
TOTAL
100
0.143
100
-
Critica is currently conducting ongoing mineralogy and metallurgical
CRITICA LIMITED Level 2, 16 Altona Street, West Perth, Western Australia
ABN 51 119 678 385 | T: +61 8 6279 9428 | F: +61 8 6500 9986 | admin@critica.limited | www.critica.limited
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ASX: CRI
Criteria
JORC Code explanation
•
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.
Commentary
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.
CRITICA LIMITED Level 2, 16 Altona Street, West Perth, Western Australia
ABN 51 119 678 385 | T: +61 8 6279 9428 | F: +61 8 6500 9986 | admin@critica.limited | www.critica.limited
12
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