St Arnaud Comstock Mineralisation Intersected
Released
Released
Announcement PDF
ASX : AKA
B R I N G I N G V I C T O R I A ' S G O L D T O L I F E 1
A S X A N N O U N C E M E N T
22 DECEMBER 2025
General
ST ARNAUD COMSTOCK - SHALLOW VISIBLE GOLD
IN NEW STRUCTURE
ST ARNAUD – COMSTOCK PROJECT
• Visible gold intersected near surface within hole 25NED007, 140m west of the Comstock Fault
and characterises a new mineralised structure sub parallel to the inferred JORC Resource.1
Gold bearing structure is approx. 125m vertically from surface and its discovery is significant
given it has not been previously identified or exploited by legacy exploration and mining.
Assays are expected within five weeks.
• Second extension to Comstock mineralisation within one month. This new structure to
the west of the main Comstock Shear, comes soon after mineralisation was extended by up
to 100m to the north in recently reported hole 25NED0022
, also with high-grade visible gold
highlighted by 1m @ 65.37g/t Au from a shallow 116m.
• The additional mineralisation adds to production potential. St Arnaud Comstock Project is
proximate to the Wedderburn Gold Mill, owned and operated by small mining specialists Core
Prospecting Pty Ltd who are assessing pathway to bring Comstock to small scale production3
.
• Elsewhere, diamond drilling continues at Aureka’s flagship Irvine Project (Stawell)
exploring continuity to mineralisation up dip of the Resolution Fault structure proximal to the
converging Tenacity Hanging Wall fault, which hosts the record high assays of 10m @ 12.1g/t
Au from 413m reported in October including, including 0.3m @ 183g/t Au from 413m and
0.3m @ 64.3g/t Au from 413.8m4
, and future testing of the new Resolution footwall vein set
identified in holes RD048 and RD0475
that both intersected high grade visible gold.
1
ASX Release, 13 June 2025: St Arnaud Maiden JORC MRE and Exploration Target - Amended
2
ASX Release, 20 Nov 2025: St Arnaud Comstock High Grade Assays
3
ASX Release, 08 Dec 2025: Core Prospecting St Arnaud Engagement
4
ASX Release, 15 Oct 2025: Irvine Drilling Highest Assay Since Discovery
5
ASX Release, 03 Dec 2025: Irvine Drilling – Resolution Footwall Delivers Hight Grade Results.
Management
Comment
“I am delighted to be reporting further occurrences
of visible gold at St Arnaud, Comstock, with
extensions this time to the west after our recent
highlight intercepts extending mineralisation to
the north. It comes just as mill owners Core
Prospecting Pty Ltd assess the possible pathway to
small scale production for Comstock.
- James Gurry, Managing Director
ASX : AKA B R I N G I N G V I C T O R I A ' S G O L D T O L I F E 2
22 DECEMBER 2025
Cautionary Statement
The Company cautions that visual estimates of mineral abundance should never be considered a proxy or substitute
for laboratory analysis. Laboratory assay results are required to determine actual grade of the visible mineralisation
reported in preliminary geological logging. Pictured in this release is visible gold only from 25NED007. Mineralisation
observations for 25NED007 are set out in Table 1 of this release. The Company will update the market when
laboratory analytical results become available.
ST ARNAUD COMSTOCK PROJECT - SHALLOW VISIBLE GOLD IN NEW
STRUCTURE
• The intersection of visible gold along a subparallel structure to the main Comstock
Shear highlights the ongoing discovery potential at St Arnaud’s Comstock and the
opportunity for continued growth and resource expansion.
6
ASX Release, 20 November 2025: St Arnaud Comstock - High Grade Assays
Exploration
Manager
Comment
“The discovery of a new near-surface structure
hosting visible gold approximately 140m west of
the main Comstock Shear target continues to
illustrate the discovery potential of the St Arnaud
gold field. Hole 25NED007 was drilled primarily to
target the down dip extension of the Main
Comstock Shear and the new intercept of
additional visible gold demonstrates the ongoing
exploration upside that still remains within the
Comstock project.
Significant arsenopyrite and pyrite mineralisation
have been observed deeper within 25NED007 below
the near surface visible gold, and both are
associated with laminated and brecciated quartz
veins, which we are confident is the northern
extension of the Comstock Shear zone that has
previously returned high grade assays up to 109g/t
Au6
, and the primary target of 25NED007.
The newly identified structure and visible gold
observed within 25NED007 occurs subparallel to
the main Comstock Shear and has potential for
both along strike and down dip continuity and
represents a new near-surface target for future
exploration drilling and resource expansion.”
- Jozef Story, Exploration Manager
ASX : AKA B R I N G I N G V I C T O R I A ' S G O L D T O L I F E 3
22 DECEMBER 2025
• Approximated 12 grains of visible gold intersected at 127.6 m, ranging from 0.5 to 1.0mm
in length within a steeply dipping faulted laminated quartz vein (Figures 1, 2, 3 overleaf).
• The newly identified visible gold mineralisation is hosted within a bedding parallel laminated
quartz vein, indicative of the gold mineralisation observed within the main Comstock Shear.
• The new visible gold intercept and steeply dipping laminated quartz vein represents yet
another target opportunity with possible strike continuity and capacity for further gold
discoveries external to the Maiden JORC Resource7
, and also supports ongoing potential to
develop a future pathway to near-term production at St Arnaud Comstock.
• This announcement relates to the presence of visible gold in hole 25NED007, part of a
seven-hole diamond drilling program completed at St Arnaud Comstock between April
through to September of this year. Logging and sampling of 25NED007 remains in progress
and assays are expected within the next five weeks.
• Aureka continues to process drill hole 25NED007. Significant arsenopyrite and pyrite
mineralisation have been observed deeper within the hole proximal to laminated and
brecciated quartz veins believed to be the northern extension of the Comstock Fault.
Characteristics of the zone appear to be similar to 25NED001 which included significant
intercepts of 6.9m @ 4.2g/t Au from 422m (incl. 0.75m @ 18.6g/t Au) and 3.2m @ 4.71g/t Au
from 434.0m (incl. 0.6m @ 19.9g/t Au from 435.9m)8
.
• Partial assays from drill hole 25NED007 are expected in the next five weeks. The diamond
drilling campaign at St Arnaud Comstock comprised 7 holes for 2,253 metres drilled, the
program commenced in April 2025 and concluded in September 2025. As earlier core shed
work was prioritised on the high grade results from Aureka’s flagship Irvine Project, the
logging and sampling is in progress on the remaining holes from the St Arnaud campaign
(25NED004, 25NED006, 25NED006A and final sections of 25NED007).
7
ASX Release, 13 June 2025: St Arnaud Maiden JORC MRE and Exploration Target - Amended
8
ASX Release, 24 July 2025: Multiple high-grade gold intercepts at St Arnaud Comstock
ASX : AKA B R I N G I N G V I C T O R I A ' S G O L D T O L I F E 4
22 DECEMBER 2025
Figure 1: St Arnaud Comstock visible gold (25NED007 logging complete, assays pending) and pyrite. Note,
the green colour is residual chinagraph pencil markings from the logging process.
Figure 2: Microscope image of core containing visible gold and pyrite 25NED007
ASX : AKA B R I N G I N G V I C T O R I A ' S G O L D T O L I F E 5
22 DECEMBER 2025
Figure 3: Microscope image of core containing visible gold 25NED007.
ASX : AKA
B R I N G I N G V I C T O R I A ' S G O L D T O L I F E 6
A S X A N N O U N C E M E N T
22 DECEMBER 2025
General
Figure 4: St Arnaud Comstock Project showing previously reported drilling and intercepts outside current JORC Resource9
. Red/yellow star indicates visible
gold intercepts reported in this release (25NED007)
9
ASX Release, 15 Oct 2025: Irvine Drilling Highest Assay Since Discovery
A S X A N N O U N C E M E N T
22 DECEMBER 2025
Figure 5 – Comstock plan view maiden resource outline with mineralisation trends and core drill hole traces10
& 11
.
Red/yellow star indicates location of visible gold within 25NED007, the subject of this release where visible gold has been
observed in the diamond drill core.
10
ASX Release, 21 January 2022: Maiden Diamond Drilling on St Arnaud’s Nelson Line Intersects Broad Gold and Silver Mineralisation
11
ASX Release, 20 November 2025: St Arnaud Comstock - High Grade Assays
22 DECEMBER 2025
St Arnaud’s High Grade and Visible Gold Results at Comstock
The visible gold observed within 25NED007 follows the high-grade Visible Gold previously
reported within several drill holes drilled across the St Arnaud goldfield, including the most
recent results reported in November 202512
that included:
• 1m @ 65.37g/t gold (Au) from 116.2m (25NED002)
○ incl 0.3m @ 109g/t Au from 117.2m
○ and 0.4m @ 65.4g/t Au from 116.2m
• 10.04m @ 1.58g/t Au from 189.68m (25NED003)
• 15.39m @ 0.63g/t Au from 202.50m (25NED005)
The above high-grade intercepts associated with visible gold conform with historical reporting
of gold production from the St Arnaud gold field which historically produced 400koz at an
estimated grade of 15g/t Au.13
Table 1: Hole 25NED007 Visible Gold Mineralisation Observations
Hole From (m) To (m) Mineralisation Type Mineral Present Abundance Au
Timing for
release of Assay
Results
25NED007 127.6 127.9
Approximately 12 grains of visible gold,
ranging from 0.5 - 1 mm in length, with
subordinate arsenopyrite and pyrite,
occurring within a steeply dipping
faulted laminated quartz vein
Gold <1% 5 weeks
The Company cautions that visual estimates of mineral abundance should never be considered a proxy or
substitute for laboratory analysis. Laboratory assay results are required to determine actual grade of the
visible mineralisation reported in preliminary geological logging. Pictured in this release is visible gold only
from 25NED007.
• The visible gold Mineralisation observed within 25NED007 occurs outside of the maiden
56koz maiden JORC resource reported in June 202514
and is hosted within a faulted
bedding parallel laminated quartz vein approx. 140m west of and subparallel to the main
NW trending Comstock shear
• The visible gold is associated with a 10cm steeply dipping faulted laminated quartz vein
containing approximately 12 grains of visible gold, ranging from 0.5 - 1 mm in length, with
subordinate arsenopyrite and pyrite.
• The occurrence of additional visible gold at St Arnaud continues to highlight the gold
fertility of the Comstock prospect, demonstrating the potential for further discoveries with
potential to expand the Maiden Resource at St Arnaud that was reported in June this
year15
.
12
ASX Release, 20 November 2025: St Arnaud Comstock - High Grade Assays
13
St Arnaud historical production taken from: Krokowski de Vickerod, J., Moore, D.H. and Cayley, R.A., 1997
14
ASX Release,13 June 2025: St Arnaud Maiden JORC MRE and Exploration Target - Amended
15
ASX Release,13 June 2025: St Arnaud Maiden JORC MRE and Exploration Target - Amended
22 DECEMBER 2025
The St Arnaud Comstock Project
The Comstock prospect sits on the eastern margin of the Stawell Geological zone of the Lachlan
Orogen within the Saint Arnaud Group metasediments, which are unfossiliferous, quartz rich
turbidites assumed to be Cambro-Ordovician in age. Comstock is located within the historic St
Arnaud Goldfields along the Nelson line of reef and is situated approximately 2 kilometres
north of the township of St Arnaud.
Locally, the geology of the Comstock project consists of a package of tightly folded turbidites
with distinct shale and sandstone layers of varying thicknesses. The area is dominated by a
NNW trending, west dipping fault/shear zone known as the Comstock Shear. The shear zone is
interpreted to lie within the hinge zone of a large-scale syncline and is confined by a wide, shale
dominant zone of sediments. Shale directly adjacent to the shear zone tends to be highly
carbonaceous and very dark grey to black in colour. Course euhedral pyrite crystals seem to be
syngenetic to this carbon rich zone of fine sediments, quartz veining is associated with gold
mineralisation and is massive to stylolitic in texture.
Primary gold mineralisation at St Arnaud is hosted within quartz veins which are structurally
controlled within very complex structural domains associated with folding and NNW trending,
west dipping thrust faults. Gold mineralisation is hosted by quartz reef systems within brittle
fractures and faults and can extend from a few metres long to a few kilometres along strike but
usually a few hundred metres. These NNW trending reefs have steep plunging gold shoots. The
mineralisation has a base metal signature of Au + As + Ag + Pb. In historical records, the gold
ore was characterised by a relatively high sulphide content up to 5% pyrite, chalcopyrite,
arsenopyrite, galena and silver. Most of the mines stopped at the oxide-sulphide interface due
to reduced grade and poor recoveries from sulphide ores. The St Arnaud Comstock pit is a
previous mine site (last production 1995) and lies within the greater St Arnaud gold fields that
historically produced 400koz at an estimated 15g/t Au16
.
There appears to be an association with green-black carbonaceous shales and higher gold
grades.
16
St Arnaud historical production taken from: Krokowski de Vickerod, J., Moore, D.H. and Cayley, R.A., 1997
22 DECEMBER 2025
Figure 7 – St Arnaud Comstock pit, picture taken from the west, proximate to the location of visible gold in 25NED007
Comstock - Proximity to a number of operating gold mills
St Arnaud Gold Project and the Comstock pit lies within trucking distance to a number of gold
processing plants in Victoria. With the current strong gold price environment Aureka intends to
begin community, scoping and regulatory approval work to plan for a productive future at
Comstock and the St Arnaud gold field.
22 DECEMBER 2025
On 8th
December 2025, Aureka announced it has engaged mill owners and small-scale Victorian
gold production specialists, Core prospecting, to assist with the advancement of the St Arnaud
Comstock Project and significantly de-risk Aureka's potential pathway to first production17
.
Figure 6 – St Arnaud Comstock Project relative location to a number of gold processing mills in Victoria including
Wedderburn within the 50km range.
Maiden Mineral Resource
In June 2025 AKA released a maiden JORC Mineral Resource Estimate (MRE) of 1.45M tonnes at
1.21g/t Au for 56,500 oz gold has been determined (Table 2) and additionally, an exploration
target around the inferred resource has been estimated to range between 3.0Mt and 3.5Mt, at
17
ASX Release, 08 December 2025: Core Prospecting St Arnaud Engagement
22 DECEMBER 2025
grades 1.2g/t to 1.0g/t resulting in an exploration target range estimate of 112koz to 116koz of
gold and potentially economic amounts of silver at a grades of 1.9g/t to 2.02g/t Ag for total of
195koz to 214koz silver (Table 3).
Table 2 – Comstock Project Mineral Resource Estimate in accordance with the 2012 edition of JORC Code18
.
The preceding statements of Mineral Resources conforms to the Australasian Code for Reporting of Exploration Results, Mineral
Resources and Ore Reserves (JORC Code) 2012 Edition. All tonnages reported are dry metric tonnes. Minor discrepancies may occur
due to rounding to appropriate significant figures.
Table 3 – Comstock Project estimated Exploration Target in accordance with the 2012 edition of JORC Code19
.
Prospect
Exploration Target*
Range Tonnes
(Mt)
Gold
Grade
(g/t)
Gold
ounces (k
Oz)
Silver
Grade
(g/t)
Silver
ounces (k
Oz)
Comstock (St
Arnaud)
Lower 3.0 1.2 116 2.02 195
Upper 3.5 1.0 112 1.90 214
The potential quantity and grade of the Exploration Target is conceptual in nature and there has been insufficient exploration to
estimate a Mineral Resource in relation to this Exploration Target. It is uncertain if further exploration will result in the estimation
of a Mineral Resource in relation to these Exploration Targets.
18
ASX Release, 13 June 2025: St Arnaud Maiden JORC MRE and Exploration Target – Amended
19
ASX Release, 13 June 2025: St Arnaud Maiden JORC MRE and Exploration Target – Amended
Prospect
Cut-Off
Gold
(g/t)
Inferred
Tonnes Gold Grade
(g/t)
Gold
Ounces
Grade
(g/t)
silver
Silver
(oz)
Comstock (St
Arnaud)
>0.5 1,450,000 1.21 56,500 2.14 100,00
22 DECEMBER 2025
This announcement has been approved for release by the Board of Directors.
For further information, please visit www.aureka.com.au, or contact:
Jame Gurry
James.Gurry@aureka.com.au
Ph: (03) 9692 7222
Aureka uses InvestorHub for enhanced, 2-way, communication with shareholders, providing
easy access to Company updates, reports, and announcements. Investors are encouraged to
sign up to the InvestorHub distribution list on the Company’s website. Sing up here:
https://investorhub.aureka.com.au/
22 DECEMBER 2025
Competent Persons Statements
The information in this announcement that relates to exploration results, data quality,
geological interpretations, for the St Arnaud Comstock Gold Project is based on, and fairly
represents, information compiled by Jozef Story, a Competent Person who is a Member of the
Australian Institute of Geoscientists (MAIG) (#10079). Mr Story has sufficient experience that is
relevant to the style of mineralisation and type of deposits under consideration and to the
activity currently being undertaken to qualify as a Competent Person as defined in the 2012
Edition of the “Australasian Code for Reporting of Exploration Results, Mineral Resources and
Ore Reserves.” Mr Story consents to the publishing of the information in this presentation in
the form and context in which it appears. The Company confirms that it is not aware of any new
information or data that materially affects the information included in the relevant
announcement and that all material assumptions and technical parameters underpinning the
estimates in the relevant announcement and that all material assumptions and technical
parameters underpinning the estimates in the relevant ASX announcement continue to apply
and have not materially changed.
The information in this announcement that relates to Mineral Resources and Ore Reserves
statements and Exploration Target potential statements for the St Arnaud Comstock Gold
Project is based on, and fairly represents, information compiled by Mr. Daniel Brost BSc
(Economic Geology) - MSc (Mine Engineering). Mr. Brost is not employed by Aureka Limited and
has acted as an independent consultant on the Comstock Prospect Mineral Resource
estimation. Mr. Brost is a Chartered Professional Geology and a Member of the Australasian
Institute of Geologists (#221836) and has sufficient experience with the style of mineralisation,
the deposit type under consideration and to the activities undertaken to qualify as a Competent
Person as defined in the 2012 Edition of the “Australasian Code for Reporting of Exploration
Results, Mineral Resources and Ore Reserves (The JORC Code). Mr. Brost consents to the
inclusion in this report of the contained technical information relating the Mineral Resource
Estimation in the form and context in which it appears.
Exploration Target – Comstock Project
On 13 June 2025, AKA announced the maiden gold Exploration Target20
at its 100%-owned St
Arnaud Comstock project in Victoria, Australia. Notably, the Exploration Target was constrained
to the current drill footprint at Comstock, as at the time this was the only area that contained
sufficient drilling to determine continuity and infer grade ranges. Significant potential exists to
increase the size of the exploration target with additional drill results beyond the Exploration
Target area.
The potential quantity and grade of the Exploration Target is conceptual in nature and therefore
is an approximation. There has been insufficient exploration to estimate a Mineral Resource,
and it is uncertain if further exploration will result in the estimation of a Mineral Resource. The
Exploration Target has been prepared and reported in accordance with the 2012 edition of the
JORC Code.
20
ASX Release: St Arnaud Maiden JORC MRE and Exploration Target – Amended, 13 June 2025
22 DECEMBER 2025
APPENDIX A
St Arnaud: Comstock Gold Project
JORC Code, 2012 Edition - Table 1
Section 1 Sampling Techniques and Data
Criteria JORC Code explanation Commentary
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.
• Include reference to 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 (eg submarine
nodules) may warrant disclosure of
detailed information.
Air Core & Reverse Circulation Drilling
• All air-core (AC) drill holes have been
routinely sampled at 1m intervals
downhole directly from a rig mounted
cyclone. Each metre is collected and
placed on a plastic sheet on the ground
and preserved for assay sub-sampling
analysis as required. For RC, each metre
of sampling is collected in individual
sequentially numbered plastic bags and
preserved.
• Sub-samples for assaying are generated
from the 1m preserved samples and
have been prepared at the drill site by
either a spear sampling method (AC) or
riffle split (RC) based on logged geology
and mineralisation intervals. Sub-
samples have been taken at 1m
intervals or as composites ranging from
2-5m intervals ensuring a sample
weight of between 2 to 3 kg per sub-
sample.
• Certified reference material and sample
duplicates have been inserted at regular
intervals with laboratory sample
submissions.
Diamond Core Drilling
• The diamond drill core samples are
selected on geological intervals varying
from 0.2m to 1.3m in length.
• All drill core is routinely cut in half
(usually on the right of the marked
orientation line) with a diamond saw
and submitted for analysis.
Representative sampling is ensured by a
combination of Company procedures regarding
quality control (QC) and quality assurance/
Testing (QA). Certified standards and blanks are
routinely inserted into assay batches.
Drilling
techniques
• Drill type (e.g. core, reverse circulation,
open-hole hammer, rotary air blast,
auger, Bangka, sonic, etc) and details
Air Core (AC) Drilling
• Legacy AC drilling has been carried out
using a Wallis Mantis 80 AC rig mounted
22 DECEMBER 2025
(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).
on a Toyota Landcruiser base. The AC
rig used a 3.5” blade bit to refusal,
generally just below the fresh rock
interface.
Reverse Circulation Drilling
• Legacy RC drilling has been conducted
using a track-mounted drill rig; 400psi
900cfm compressor and booster;
auxiliary compressor where dictated by
water in-flows. The RC rig used a 4”
diameter RC hammer with 110mm
button bit to progress the hole to
design depth or where groundwater
inflows compromise sample quality.
Diamond Core Drilling
• Legacy diamond drilling was conducted
using Deepcore track-mounted LM90
and LF130.
• Pre-collars have been drilled to solid
bedrock using an HWT (114.3mm) drill
bit followed by diamond coring with a
diameter of 63.5mm (HQ)
• Diamond drilling of HQ3 (triple-tube) is
undertaken to ensure maximum core
recovery.
• Drilling completed by Aureka was
conducted by AMWD
• Pre-collars were drilled to solid
bedrock using an HQ3 drill bit (93mm
hole diameter) coring down to solid
rock followed by HWT casing diamond
(114.3mm hole diameter)
• Diamond drilling of HQ3 (triple-tube)
was undertaken to ensure maximum
core recovery.
• Drill core has been orientated with a
Reflex ACT III core orientation tool then
continuously marked with a line while
on an angle iron cradle
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.
Air Core & Reverse Circulation Drilling
• Legacy AC & RC drill recoveries have been
visually estimated as a semi-quantitative
range and recorded in the log.
• Recoveries are generally high (>90%), with
reduced recovery in the initial near-surface
sample.
• Samples are generally dry, but many became
wet at the point of refusal in hard ground
below the water table.
• Geological control maintained at the drill site
at all times to ensure drilling and sampling is
to required standard.
22 DECEMBER 2025
• No sampling issue, recovery issue or bias has
been picked up and is considered that both
sample recovery and quality is adequate for
the drilling technique employed.
Diamond Core Drilling
• All diamond core has been logged
capturing any core loss, if present, and
recorded in the database.
• All drill depths are checked against the
depth provided on the core blocks and
rod counts are routinely carried out by
the driller.
Core recovery for the areas sampled is generally
good.
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.
• Geological logging of samples follows
Company and industry common practice.
Qualitative logging of samples includes (but
is not limited to), lithology, mineralogy,
alteration, veining and weathering.
• All logging is quantitative, based on visual
field estimates.
• Most if all AC & RC chips and core were
photographed in detail.
• For AC & RC, a small representative sample
has been retained in a plastic chip tray for
future reference and logging checks.
• Detailed chip logging, with digital capture,
has been conducted for 100% of chips logged
by previous geological teams.
• Detailed core logging, with digital capture
and digital photography, was conducted for
100% of the recent Aureka diamond drilling
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 duplicate/second-half
sampling.
• Whether sample sizes are appropriate to
the grain size of the material being
sampled.
Air Core & Reverse Circulation Drilling
• Procedures have been followed to ensure
sub-sampling adequacy and consistency.
These included (but are not limited to), daily
workplace inspections of sampling
equipment and practices.
• Only recent core drilling incorporated blanks
and certified reference materials are
submitted with the samples to the laboratory
as part of the quality control procedures.
• AC composite, 1m individual and EOH
samples have been collected as grab
samples.
• Legacy drill sample preparation and base
metal and precious metal analysis is
undertaken by a registered laboratory (ALS
Perth, WA). Sample preparation by dry
pulverisation to 85% passing 75 microns is
undertaken by ALS Adelaide, SA.
• The sample sizes are considered appropriate
to correctly give an accurate indication of
mineralisation given the qualitative nature of
the technique and the style of gold
22 DECEMBER 2025
mineralisation sought.
Diamond Core Drilling
• Detailed diamond core logging, with
digital capture, has been conducted for
100% of the core by previous geological
team.
• Half core is sampled from NQ and HQ
diameter drill core.
• Company procedures have been
followed to ensure sub-sampling
adequacy and consistency. These
included (but are not limited to), daily
workplace inspections of sampling
equipment and practices.
• Blanks and certified reference materials
are submitted with the samples to the
laboratory as part of the quality control
procedures.
• No second-half sampling has been
conducted at this stage.
• The sample sizes are appropriate to
correctly represent the sought-after
mineralisation.
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 (e.g. standards, blanks,
duplicates, external laboratory checks)
and whether acceptable levels of
accuracy (i.e. lack of bias) and precision
have been established.
• Sample preparation for legacy samples was
undertaken by ALS, Adelaide, SA. Samples
are dried at 90C for 6-12 hours, crushed with
hammer mill to
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