NORTH STANMORE ADVANCES AS A GLOBAL HREE DEPOSIT
Released
Released
Announcement PDF
ASX RELEASE
16 January 2025
NORTH STANMORE ADVANCES AS A GLOBAL HEAVY RARE
EARTH CLAY DEPOSIT
Significant Indicated JORC resource upgrade
Victory Metals Limited (ASX: VTM, Victory or the Company) is pleased to announce a
transformative update to the Mineral Resource Estimate (MRE) for its North Stanmore Heavy Rare
Earth Elements (HREE) Project in Western Australia.
Despite being a minimal infill drilling program, this phase has delivered a significant upgrade, with
71% of the resource now classified as Indicated, highlighting the robust nature and continuity of
mineralisation.
Highlights:
•
Indicated JORC category upgraded to 71% of the overall Mineral Resource Estimate (MRE)
now totalling 176.5 million tonnes @ 503ppm (TREO)1 2, that is expected to compliment
the advanced Scoping Study.
•
Overall MRE upgraded to 247.5 million tonnes @ 520ppm TREO2 (Indicated and Inferred).
•
High-grade near surface zone expansion (see figure 2) provides a robust foundation for
North Stanmore’s development now totalling 53 million tonnes @ 1,012ppm TREO3
(Indicated and Inferred), representing a significant upgrade from the July 2024 MRE 4.
•
Consistently high Heavy Rare Earth Oxide (HREO) 5 to TREO ratios of 38% in the (MIN)
Indicated category which firmly establishes North Stanmore’s position in the critical Heavy
Rare Earth sector.
•
Scandium (Sc) resource increased with Scandium set to see increasing demand for its use
in solid oxide fuel cells (SOFCS) and aluminum-scandium alloys in the aerospace and defence
industry.
•
Significant strike length of 13.5km confirms North Stanmore as one of the largest
contiguous heavy rare earth-dominated clay-hosted deposits globally with mineralisation
remaining open in all directions, with significant exploration upside 6.
1 TREO (Total Rare Earth Oxide) = La2O3 + CeO2 + Pr6O11 + Nd2O3 + Sm2O3 + Eu2O3 + Gd2O3 + Tb4O7 + Dy2O3 + Ho2O3 + Er2O3 + Tm2O3 +
Yb2O3 + Lu2O3 + Y2O3 + Sc2O3.
2 >330ppm cut-off
3
>600ppm cut-off
4 Refer to ASX release dated 16th July 2024 titled “LARGEST AUSTRALIAN INDICATED HEAVY REE RESOURCE CONFIRMED”.
5 HREO (Heavy Rare Earth Oxide) = Eu2O3 + Gd2O3 + Tb4O7 + Dy2O3 + Ho2O3 + Er2O3 + Tm2O3 + Yb2O3 + Lu2O3 + Y2O3.
6 Refer to ASX release dated 6th November 2024 titled “NORTH STANMORE GROWS TO 13.5KM IN STRIKE”
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Victory’s CEO and Executive Director Brendan Clark commented:
“This updated MRE reinforces North Stanmore’s status as a globally significant rare earth
resource. With mineralisation remaining open in all directions, the Project’s growth potential is
significant.
The expansion of the high-grade zone and an overall mineral resource that has increased to over
247 million tonnes, coupled with a 13.5km strike and consistent high heavy rare earth to total rare
earth ratios demonstrates the North Stanmore Project’s potential of becoming one of the largest
contiguous clay hosted heavy rare earth enriched deposits in the world.
This update strengthens our strategic position and highlights our ability to deliver sustainable,
ethically sourced high-value critical minerals for the global clean energy and defense sectors.
Also exciting is the significant Scandium resource, with Scandium having a strong outlook and
Scandium oxide currently having a price in excess of $1,300 per kg7.
The results from this updated MRE will be incorporated into our very advanced Scoping Study,
which we anticipate releasing in Q1 2025, which will provide insights into the economic and
technical feasibility of North Stanmore.”
January 2025 MRE
Victory commissioned leading geological and mining consultancy, MEC Pty Ltd (MEC) to update the
North Stanmore rare earth oxide (REO) Mineral Resource Estimate (MRE) in October of 2024, the
MRE update was completed by MEC in January of 2025. The North Stanmore project is in Western
Australia with sealed road access via the Great Northern Highway to Cue, and then via unsealed
road approximately 6km north of Cue to the project.
The January 2025 MRE has been estimated within the boundaries of ten tenements; E20/0544,
E20/0871, E20/971, E20/1016, E20/2468, E20/2469, P20/0543, P20/2007, P20/2153, and P20/2403,
with all tenure held by Victory Cue Pty Ltd, a wholly owned subsidiary of Victory (Figure 1).
The Mineral Resources for the North Stanmore REE Deposit, which is being reported in accordance
with the JORC Code 2012, is estimated to be 247.5 million dry metric tonnes at 520 ppm Total Rare
Earth Oxide plus Scandium Oxide (TREO + Sc2O3), using an economic cut-off grade of 330ppm TREO
plus Scandium Oxide, inclusive of high-grade domain (≥600 ppm TREO cut-off) of 53 million tonnes
@ 1,012 ppm TREO plus Sc2O3 (Figure 2).
7
Refer to https://www.statista.com/statistics/280038/chinese-domestic-and-export-prices-for-rare-earth-oxides/
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Figure 1: North Stanmore MRE by ResCat
Figure 2: Cross section 6,973,900mN, looking north, 5x vertical exaggeration and showing the High-Grade intercept.
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A site visit was conducted on May 30, 2024, by MEC Manager of Resources, Mr Dean O’Keefe and
MEC Resource Geologist, Mr Issam Digais, accompanied by Victory Metals personnel including
Exploration Site Supervisor, Mr Savvas Hagiantoniou. Dean O’Keefe is Competent Person for the
North Stanmore MRE. During the site visit, the general layout of the area and project location was
checked. MEC also conducted a check survey of drillhole collar locations, the surveyed locations
were confirmed as being in close proximity to the planned drillhole locations, all within 3m. No
production has occurred at the North Stanmore site.
The North Stanmore MRE occurs in regolith above an alkaline intrusion. Despite its magnetic
signature, the North Stanmore intrusion had not been recognised previously on regional geological
maps. Petrological data for samples of diamond core indicate that the intrusion is post-tectonic and
hence post-Archean in age.
The North Stanmore Intrusion is a large (approximately 16km by 5km) differentiated ultramafic to
felsic intrusion. Lithologies identified in thin section include kaersutite and carbonate-bearing
peridotite, orthopyroxenite, clinopyroxenite, leuco- and leuco-gabbro (ijolite), diorite, monzonite
and syenite. Some regolith samples are strongly LREE enriched indicating that the intrusion also
contains carbonatite. However, the uniformly high HREO/TREO of the regolith (of approximately
34% to 38%) indicates that carbonatite represents a subordinate phase in the intrusion.
The North Stanmore Intrusion is interpreted to be associated with an early Proterozoic plume track
that was responsible for alkaline magmatism extending in a broad belt from Mt Weld carbonatite
near Laverton through Leonora to Cue.
The rare earth element mineralisation occurs in a relatively flat-laying saprolite-rich clay horizon
beneath a veneer of unconsolidated colluvium that ranges in thickness from 0–36m. The uniformity
of Nb/Ta ratios (Nb/Ta 16±4) in the regolith above the North Stanmore Intrusion indicates that the
regolith developed in situ. Importantly, studies have shown that Nb/Ta ratio of regolith over
carbonatites and other alkaline intrusions closely resembles the Nb/Ta ratio of their source plume
generated lithologies.
REEs are adsorbed onto kaolinite or form secondary REE phosphates, rhabdophane (after monazite),
churchite (after xenotime), and florencite. QEMSCAN mineralogical studies show that the REEs are
mainly hosted by <20µm particles.
Scandium is enriched throughout the regolith profile due to the breakdown of pyroxene in the North
Stanmore source lithologies. Scandium is generally considered to behave differently to the REEs,
which are adsorbed as outer-sphere complexes on clay surfaces, found in Al(OH)2SiO sites, or occur
as hydrated REE bearing phosphates. However, Sc3+ behaves like the transition metals (Ni2+ , Co2+,
Cu2+) and, due to its smaller ionic radius, it adsorbs onto vacancy sites in clay lattices or attaches to
the surface of Mn oxides.
Scandium is a highly valuable critical element occurring in the same Group of the Periodic Table (Gp.
3B) as the lanthanides. It occurs predominantly in HREE bearing ultramafic and mafic igneous rocks
like the North Stanmore Intrusion. By contrast, felsic alkaline rocks and granitoids are more LREE
enriched and contain negligible amounts of Scandium. The chemical properties of Scandium are
distinct from the other REO’s and Scandium has recently been recognised to have superconducting
properties. Scandium has been deemed a critical mineral due to current Chinese and Russian control
of the supply chain.
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Yttrium is classified as a REO because of its similar ionic radius to the lanthanides, and similar
chemical properties to the HREEs.
A geological cut-off grade of 150ppm TREO + Sc2O3 was used to separate mineralised material (MIN)
from weakly mineralised material (WMM). A high-grade mineralisation (HGMIN) domain was
additionally modelled above a geological cut-off grade of 600ppm TREO + Sc2O3. A high grade
domain was required to separate mixed populations of grade for estimation. An economic cutoff
grade of ≥330ppm TREO +Sc2O3was then applied for Mineral Resource reporting.
Logging was completed for 90% of the sample intervals and used to produce surfaces to delineate
the colluvium, saprolite, and basement.
Drilling at North Stanmore to support the January 2025 MRE includes 755 drillholes for 42,118.9m,
inclusive of 694 Air-core (AC) drillholes for 38,188m, 50 Reverse Circulation (RC) drillholes for
3,166m, and 11 diamond drillholes for 764.9m. Drillhole depths range from 10m to 222m. All
drillholes were completed by Victory from 2022 to 2024. The drillhole spacing at North Stanmore
(MRE area) ranges from 50m x 50m to 250m x 100m.
Eleven percussion (air core and RC) drillholes have been twinned with diamond drilling (DD001 to
DD011). Samples were submitted to the laboratory for analysis only where the initial screening by
handheld XRF generated a mineralised value, whereas the diamond drilling was sampled and
assayed along the entire length of the drillhole. There is good spatial correlation between the
percussion and diamond assays for the twin drilling. The use of the handheld XRF tool is a
reasonable indicator of zones of mineralisation within the percussion drillholes.
Local validation was completed by comparing the composite grades used to estimate the block
values against the estimated block values. There was close correlation between composite assays
and estimated block grades, with some small differences resulting from the smoothing effect of
ordinary kriging. Min/max checks were utilised to ensure all blocks were populated. Ore Block
Model validation functions were used to check for overlapping blocks, there were no incidence of
overlapping blocks.
The Resource has been classified as Indicated and Inferred categories, in accordance with the 2012
Australasian Code for Reporting of Mineral Resources and Ore Reserves (JORC Code). Unclassified
material based on sparse drillhole data has not been reported as part of the Mineral Resource. A
range of criteria has been considered in determining this classification including:
• Geological continuity and lode geometry
•
Data quality
•
Drill hole spacing
An Indicated Mineral Resource classification was based on drillhole spacing (250m x 100m, closing
to 50m x 50m), acceptable underlying QAQC, and an RTK/DGPS survey of drillhole collars. An
Inferred Mineral Resource classification was based on a drill spacing of ~500m x 100m.
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Approximately 71% by tonnage of the January 2025 MRE is classified as Indicated Mineral Resources
and approximately 29% is classified as Inferred Mineral Resources.
Three stages of metallurgical test work have been completed for the North Stanmore Project,
focusing on beneficiation, and leach test work to establish potential recoveries and processing
options.
Core Resources (Core) in Brisbane completed the third stage of test work including beneficiation
test work in March of 2024 and reported that the REE feed grade increased by 63% by rejecting the
+53µm feed material from across all samples. Core also completed leach test work on the
beneficiated material.
The leach test work program involved diagnostic metallurgical testing on a composite blend of the
beneficiated samples with a head grade of 1,283 ppm TREO. This was sourced from 23 samples and
13 drillholes from North Stanmore. The initial atmospheric leach test work program was trialed at
elevated temperatures and variable leaching conditions compared to previous work. These test
conditions yielded high recoveries of Pr (94%), Nd (94%) and heavy rare earth elements Tb (91%),
and Dy (92%) with a combined recovery of 93% Magnet Rare Earth Elements (“MREE”).
Scandium recoveries of 50% had previously been achieved, with optimisation work occurring in
parallel. These assays were conducted by Australian Laboratory Services Brisbane. The objective of
the diagnostic test work was to recover REE and Sc from the beneficiated sample using alternative
conditions to previous metallurgical programs, that successfully demonstrated increased
extractions at higher temperature (from 25°C to 100°C).
The January 2025 Updated MRE (Table 1) is stated at an economic cut-off grade of ≥330ppm TREO
+ Sc2O3, with no top cuts (as no extreme values that could bias the estimation were apparent).
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Table 1: North Stanmore January 2025 MRE (≥330ppm TREO + Sc2O3 cut-off grade)
ORE TONNES
TREO
HREO
LREO
HREO/TREO
Sc2O3
(t)
(ppm)
(ppm)
(ppm)
(%)
(ppm)
INDICATED
176,500,000
477
181
296
38%
26
INFERRED
70,900,000
533
164
369
31%
28
TOTAL
247,500,000
493
176
317
Numbers are rounded to reflect they are an estimate.
Numbers may not sum due to rounding.
36%
27
CLASSIFICATION
The sensitivity of the Mineral Resource to the reporting cut-off grade is shown in Figure 3.
Figure 3: Grade tonnage curve for the North Stanmore TREO + Sc2O3 MRE (Indicated and Inferred)
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Error! Not a valid bookmark self-reference. shows the HREO within the high-grade mineralisation (HGMIN) domain by classification above
330ppm TREO + Sc2O3, and Table 3 shows the HREO within the mineralisation (MIN) domain by classification above 330ppm TREO + Sc 2O3.
Table 2: North Stanmore January 2025 MRE HREO within the HGMIN domain (≥330ppm TREO + Sc2O3 cut-off grade)
CLASSIFICATION
MRE TONNES (t)
TREO + Sc
(ppm)
TREO
(ppm)
HREO
(ppm)
Eu2O3
(ppm)
Gd2O3
(ppm)
Tb4O7
(ppm)
Dy2O3
(ppm)
Ho2O3
(ppm)
Er2O3
(ppm)
Tm2O3
(ppm)
Yb2O3
(ppm)
Lu2O3
(ppm)
Y2O3
(ppm)
INDICATED
35,400,000
972
941
318
7.5
30.5
5.0
30.9
6.4
19.1
2.7
17.7
2.6
196
INFERRED
16,500,000
1,099
1,072
354
8.6
33.7
5.5
33.6
7.0
20.8
3.0
18.8
2.7
220
TOTAL
52,800,000
1,012
982
6.6
19.7
2.8
18.1
2.7
203
329
7.9
31.5
5.1
31.7
Numbers are rounded to reflect they are an estimate.
Numbers may not sum due to rounding.
Table 3: North Stanmore January 2025 MRE HREO within the MIN domain (≥330ppm TREO + Sc2O3 cut-off grade)
MRE TONNES (t)
TREO + Sc
(ppm)
TREO
(ppm)
HREO
(ppm)
Eu2O3
(ppm)
Gd2O3
(ppm)
Tb4O7
(ppm)
Dy2O3
(ppm)
Ho2O3
(ppm)
Er2O3
(ppm)
Tm2O3
(ppm)
Yb2O3
(ppm)
Lu2O3
(ppm)
Y2O3
(ppm)
INDICATED
141,200,000
386
361
146
2.4
12.0
2.1
13.6
3.0
9.2
1.4
9.2
1.4
92.1
INFERRED
54,500,000
399
370
106
2.6
10.4
1.7
10.1
2.1
6.2
0.9
5.8
0.9
65.2
TOTAL
195,700,000
390
364
135
2.5
11.5
2.0
12.6
Numbers are rounded to reflect they are an estimate.
Numbers may not sum due to rounding.
2.7
8.4
1.2
8.3
1.2
84.7
CLASSIFICATION
The economic cut-off grade for the January 2025 MEC MRE was ≥330ppm TREO +Sc2O3. This cut-off grade was selected based on the evaluation of
other like regolith hosted rare earth Mineral Resources.
The MIN grade and tonnage is exclusive of the HG grade and tonnage (Table 3).
Table 4 shows the LREO by domain and classification above 330ppm TREO + Sc2O3. Table 5 shows
base metals and hafnium grades above 330ppm TREO + Sc2O3.
Table 4: North Stanmore January 2025 MRE LREO Grades by Domain and Classification (≥330ppm
TREO + Sc2O3 cut-off grade)
DOMAIN
CLASSIFICATION
TONNES (t)
TREO + Sc2O3
(ppm)
LREO
(ppm)
HGMIN
INDICATED
35,400,000
972
623
HGMIN
INFERRED
16,500,000
1,099
718
HGMIN
TOTAL
51,900,000
1,012
653
MIN
INDICATED
141,200,000
386
215
MIN
INFERRED
54,500,000
399
264
MIN
TOTAL
195,700,000
390
229
Total
TOTAL
247,500,000
520
317
Numbers are rounded to reflect they are an estimate.
Numbers may not sum due to rounding.
Table 5: North Stanmore January 2025 MRE Ni, Co, Cu, Hf, (≥330ppm TREO + Sc2O3 cut-off grade)
DOMAIN
CLASSIFICATION
Tonnes
(Mt)
Ni
Co
Cu
Hf
(ppm)
(ppm)
(ppm)
(ppm)
HGMIN
INDICATED
35,400,000
36
29
43
6
HGMIN
INFERRED
16,500,000
44
26
55
5
HGMIN
TOTAL
51,900,000
39
28
47
6
LGMIN
INDICATED
141,200,000
23
14
25
7
LGMIN
INFERRED
54,500,000
45
21
47
5
LGMIN
TOTAL
195,700,000
29
16
31
6
TOTAL
247,500,000
31
19
34
6
Total
Numbers are rounded to reflect they are an estimate.
Numbers may not sum due to rounding.
MRE Composition Pie Charts
Figure 4: North Stanmore January 2025 updated MRE composition by percentage in 52.8Mt and 195.7Mt resource domains
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The high HREYO/TREYO ratios shown in Figure indicates that the North Stanmore resource contains
a significant percentage of the rare, and valuable, HREE’s dysprosium (Dy) and terbium (Tb).
Figure 5: North Stanmore Project plan overview
Regional Geology
Victory’s tenements lie within the centre of the Murchison Province, which comprises the Archaean
gneiss-granitoid-greenstone north-western Yilgarn Block. The Archean greenstone belts in the
Murchison Province, the Warda Warra and Dalgaranga greenstone belts, the southern parts of the
Meekatharra-Mount Magnet and Weld Range belts are dominated by metamorphosed supracrustal
mafic volcanic rocks, as well as sedimentary and intrusive rocks. Thermo-tectonism resulted in
development of large-scale fold structures that were subsequently disrupted by faulting. The
greenstone belts were intruded by two suites of granitoids. The first, most voluminous suite,
comprises granitoids that are recrystallised with foliated margins and massive cores, typically
containing large enclaves of gneiss. The second suite consists of relatively small, post tectonic
intrusions. Two large Archaean gabbroic intrusions occur south of Cue. These are the DalgarangaMount Farmer gabbroic complex in the southwest, and the layered Windimurra gabbroic complex
in the southeast.
Project Geology
Victory’s REE discovery occurs in regolith above the North Stanmore alkaline intrusion, discovered
north of Cue. Despite its magnetic signature, the North Stanmore intrusion had not been recognised
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previously on regional geological maps. Petrological data8 for samples of diamond core indicate that
the intrusion is post-tectonic and hence post-Archean in age.
The North Stanmore Intrusion is a large (approximately 16 km by 5 km) differentiated ultramafic to
felsic intrusion. Lithologies identified in thin section include kaersutite and carbonate-bearing
peridotite, orthopyroxenite, clinopyroxenite, leuco- and leuco-gabbro, ijolite, diorite, monzonite
and syenite. Some regolith samples are strongly LREE enriched indicating that the intrusion also
contains carbonatite. However, the uniformly high HREO/TREO of the regolith (of approximately
31% to 38%) indicates that carbonatite represents a subordinate phase in the intrusion.
The North Stanmore Intrusion is interpreted to be associated with an early Proterozoic plume track
that was responsible for alkaline magmatism extending in a broad belt from Mt Weld carbonatite
near Laverton through Leonora to Cue9.
Deposit Type
The rare earth element mineralisation occurs in a relatively flat-laying saprolite-rich clay horizon
beneath a veneer of unconsolidated colluvium that ranges in thickness from 0m to 36m. The
uniformity of Nb/Ta ratios (Nb/Ta 16±4) in the regolith above the North Stanmore Intrusion
indicates that the regolith developed in situ. Importantly, studies have shown that Nb/Ta ratio of
regolith over carbonatites and other alkaline intrusions closely resembles the Nb/Ta ratio of their
source plume generated lithologies10.
Mineralised REE saprolite horizons above the North Stanmore Intrusion occur at depths between
12m and 77m. Ce/Ce* tracks regolith oxidation, and the upper parts of regolith enrichment zones
have Ce/Ce* >1 reflecting gain of mobile Ce4+, while the lower parts of enrichment zones have
Ce/Ce* <1. Leachable clay REE deposits all have Ce/Ce* <1. The Ce/Ce* of the June 2024 updated
MRE in the Indicated category is 0.86 (Tables 1 to 4).
REEs are complexed with carbonate ions [CO32-] and bicarbonate ions [HCO3-] or occur as REE3+ ions
in soil as groundwater migrates downwards during tropical weathering. Based on
Ce/Ce*systematics11 and TREO concentrations, there appear to be four zones of REE enrichment at
North Stanmore. These are 15m to 25m, 28m to 37m, 41m to 46m and a deeper zone between 53m
and 77m. The regolith is complex and importantly some cores exhibit two zones of REE enrichment.
REEs are adsorbed onto kaolinite or form secondary REE phosphates, rhabdophane (after monazite),
churchite (after xenotime), and florencite. QEMSCAN mineralogical studies show that the REEs are
mainly hosted by <20-µm particles.
Scandium is enriched throughout the regolith profile due to the breakdown of pyroxene in the North
Stanmore source lithologies. Sc is generally considered to behave differently to the REEs, which are
adsorbed as outer-sphere complexes on clay surfaces, found in Al(OH)2SiO sites, or occur as
hydrated REE bearing phosphates. However, Sc3+ behaves like the transition metals (Ni2+ , Co2+, Cu2+)
and, due to its smaller ionic radius, it adsorbs onto vacancy sites in clay lattices or attaches to the
surface of Mn oxides12. Sc is enriched throughout the regolith profile.
8 Refer VTM ASX release dated 10 August 2022, Major Alkaline Igneous Complex Discovered
9 Fiorentini et al., (2020) Nature Sci. Repts. 10:19729
10
Cornelius et al, (2005) Geochemistry: Exploration, Environment, Analysis, Vol. 5, 291–310; Zhukova et al., (2021) Ore Geology Reviews 139, 104539
Ce/Ce* = (2*(CeN)/(LaN+PrN)), where CeN, LaN and PrN are chondrite normalised values; LaN = La concentration /0.237,
CeN =Ce concentration /0.613 and PrN =Pr concentration/0.0928; Ce/Ce* ratios >1 reflect the gain of Ce4+ at shallower regolith depths while Ce/Ce*
ratios <1 reflect the loss of mobile Ce4+ from deeper parts of weathering profiles that contain Ce3+.
12 Zhang et al., (2024) Am. Mineralogist
11
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REO Terminology
Yttrium is included as a REE because of its similar ionic radius to the lanthanides and has similar
chemical properties to the HREEs [holmium (Ho) and erbium (Er)].
Scandium, a highly valuable critical element occurs in the same Group of the Periodic Table (Gp. 3)
as the lanthanides. It occurs predominantly in HREE bearing ultramafic and mafic igneous like the
North Stanmore Intrusion. By contrast, felsic alkaline rocks and granitoids are more LREE enriched
and contain negligible amounts of Sc contents. The chemical properties of Sc are distinct from the
other REEs, and Sc has recently been recognised to have superconducting properties. Sc has been
deemed a critical mineral due to current Chinese and Russian control of the supply chain.
REE analytical data was determined by ALS using the ME-MS81 technique of fusion digestion
followed by ICPMS analysis. Results were returned in elemental form and were converted to oxides.
TREO (Total Rare Earth Oxides), LREO (Light Rare Earth Oxides), HREO (Heavy Rare Earth Oxides),
MREO (Magnet Rare Earth Oxides), and the ratio of HREO/TREO were calculated as follows:
•
TREO is the sum of La2O3, CeO2, Pr6O11, Nd2O3, Sm2O3, Eu2O3, Gd2O3, Tb4O7, Dy2O3, Ho2O3,
Er2O3, Tm2O3, Yb2O3, Lu2O3, and Y2O3,. This follows the protocol recommended by the
International Union of Pure and Applied Chemistry.13 Yttrium and Scandium are included as
they share Group IIIA properties in the Periodic Table with the lanthanides. Importantly,
yttrium exhibits similar geochemical properties to the HREOs.
•
TREOS is the sum of La2O3, CeO2, Pr6O11, Nd2O3, Sm2O3, Eu2O3, Gd2O3, Tb4O7,Dy2O3, Ho2O3,
Er2O3, Tm2O3, Yb2O3, Lu2O3, Y2O3, and Sc2O3.
•
HREO is the sum of Eu2O3, Gd2O3, Tb4O7,Dy2O3, Ho2O3, Er2O3, Tm2O3, Yb2O3, Lu2O3, and Y2O3.
•
LREO is the sum of La2O3, CeO2, Pr6O11, Nd2O3, and Sm2O3.
•
MREO (Magnet Rare Earth Oxides) are the rare earths used in the production of magnets
predominantly, Nd2O3, Pr6O11 (NdPr) and Dy2O3, Tb4O7 (DyTb).
•
HREO/TREOS is the ratio of the sum of Eu2O3, Gd2O3, Tb4O7,Dy2O3, Ho2O3, Er2O3, Tm2O3,
Yb2O3, Lu2O3, and Y2O3/sum of La2O3, CeO2, Pr6O11, Nd2O3, Sm2O3, Eu2O3, Gd2O3, Tb4O7,Dy2O3,
Ho2O3, Er2O3, Tm2O3, Yb2O3, Lu2O3, Y2O3, and Sc2O3.
•
The quality of the assays is shown in Figure by the smooth inter-element profiles in chondrite
normalised plots for the 197.2 Mt and 53 Mt resource compositions.
13 Williams Jones and Vasyukova (2018) Economic Geology
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Figure 6: Chondrite normalised plots showing smooth inter-element profiles for the resource compositions with Y plotting between
Ho and Er
Sampling and sub-sampling techniques
Air-core drilling samples were collected as 1m samples from the rig cyclone. Each sample was placed
into large green drill bags (900mmx600mm) for temporary storage onsite. Each sample was then
split using a 3-tier (87.5% - 12.5%) splitter and the split sample was placed into calico sample bags
for transport to Perth.
Sample weights and recoveries were recorded on site and weighed 1.5 - 2.5kg depending on the
sample recovery from the drill hole. The mean bulk sample weight was 8.45kg.
A handheld pXRF analyzer (Olympus Vanta) was used to determine anomalous REO (Rare earth
element) geochemistry (La, Ce, Pr, Nd and Y) from the 1m sample piles. pXRF reading times were 45
secs over 3 cycles for multielement and REO assays. These results are not considered dependable
without calibration using chemical analysis from an accredited laboratory. However, their integrity
was checked using Certified REO -bearing geochemical standards. The handheld pXRF is used as a
guide to the relative presence or absence of certain elements, including REOs vectors (La, Ce, Pr, Nd
and Y) to help direct the sampling program. Anomalous 1m samples were then transported to the
assay lab for analysis by Victory personnel. REO anomalism thresholds are determined by VTM
technical lead based on historical data analysis
Victory attended North Stanmore to collect the green sample bag which was transported by Victory
to Victory’s secure warehouse in Perth.
Measures taken to ensure sample representivity included regular cleaning of the rig between drill
holes using compressed air and weighing the bulk sample to ensure reasonable sample return
against an expected target weight.
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Drilling techniques
Drilling at North Stanmore to support the January 2025 MRE includes 755 drill holes for 42,118.9m,
inclusive of 694 Air-core (AC) drillholes for 38,188m, 50 Reverse Circulation (RC) drillholes for
3,166m, and 11 diamond drill holes for 764.9m. Drillhole depths range from 10m to 222m. All
drillholes were completed by Victory from 2022 to 2024.
The drillhole spacing at North Stanmore ranges from 50 x 50m to 250 x 100m.
Mineral Resource Classification
A range of criteria has been considered in determining this classification including:
•
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