Arrakis RC Drilling Results
Released
Released
Announcement PDF
ASX Announcement
30 April 2025
Arrakis RC Drilling Demonstrates Mineralisation Continuity
Ahead of Large-Scale Caladan AC Program in May
•
All results from RC drilling at Arrakis, part of the Caladan target area, testing
along a single line below the previously reported air-core hole 24IWBAC063
(see ASX release 15 January 2025) have been received and confirm
mineralisation continuity down dip with results including:
o
11m @ 0.5 g/t Au from 168m in 25AKSL003
o
Including 3m @ 1.2 g/t Au from 174m
5m @ 1.3 g/t Au from 243m in 25IWBRC0037
Including 2m @ 2.7 g/t Au from 246m
•
Mineralisation is open at depth and remains untested along strike.
•
The Caladan target area represents an 8km by 3km folded mafic sequence
truncated by a large shear zone to the southwest, presenting a geological
architecture similar to a number of highly endowed gold districts, including
Kalgoorlie.
•
RC results also demonstrate potential for multiple mineralised structures
within the 3km long CAL-01 regolith anomaly.
•
Heritage surveys across the Caladan target area are complete.
•
A highly anticipated 12,500m air-core program across the large-scale
Caladan target area will commence in May once drill lines have been
cleared. The program will include broadly spaced lines north and south of
recent drilling at Arrakis.
For further information or to ask questions in relation to this announcement, please visit
our Investor Hub at https://investorhub.yandalresources.com.au/link/0PQzOy
Contact Us
A: Suite 1, Level 3, 1138 Hay Street,
West Perth WA 6005
T: +61 (0)8 9389 9021
E: yandal@yandalresources.com.au
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Board and Management
Chris Oorschot
Managing Director/CEO
Greg Evans
Non-Exec Chair
Katina Law
Non-Exec Director
Tim Kennedy
Non-Exec Director
Greg Fitzgerald
Company Secretary
Commenting on the new results, Yandal Resources’ Managing Director, Mr. Chris Oorschot,
said: “To intercept intense alteration, large structures and see evidence of continuous
primary mineralisation at such an early stage across the expansive Caladan target area is
highly encouraging. With heritage surveys now complete, the Exploration Team will
commence preparations for air-core drilling. The 12,500m program will represent the first
effective systematic drilling across this 8km long, 3km wide Caladan fold structure.
Early-stage targets of this calibre and scale are now rare within the Northeastern Goldfields
of Western Australia. I would challenge investors to find a similar early-stage opportunity
within a jurisdiction like Western Australia and so close to existing mining infrastructure.”
Yandal Resources Ltd (ASX: YRL, “Yandal Resources” or the “Company”) is pleased to advise that
it has received all assay results from RC drilling across the Arrakis Prospect within the Caladan
target area. Four RC holes (700m total) were drilled within a single line that transects the core of
the Caladan Fold (See Figure 2). The Caladan target area, including the Arrakis Prospect (within
E 53/1843, E 53/2304, E 53/2192 and E 53/1882), is part of the broader Ironstone Well-Barwidgee
Gold Project (see Figure 4), located 60km south of the Jundee mining complex (ASX: NST), and
18km north of the recent Siona discovery, within the Yandal Greenstone Belt.
These deeper RC drilling results confirm mineralisation continuity and a sub-vertical geometry.
Results also highlight the potential for multiple mineralised structures within the interpreted mafic
host. Mineralisation is open at depth and remains untested along strike (see Figures 1 & 2). These
results pave the way for a large-scale 12,500m air-core program across the Caladan target area
that will commence in May, testing the 8km by 3km fold structure.
Caladan is a large-scale exploration target area identified following the completion of a ground
gravity survey in early 2024 (see ASX releases dated 11 June 2024 and 15 July 2024). In late 2024,
initial air-core drilling was completed along one line across the Caladan target area, testing the
core of the CAL-01 regolith anomaly. The air-core results returned several significant intercepts,
including 11m @ 1.7 g/t Au from 97m to the end-of-hole in 24IWBAC0063 (see ASX release 15
January 2025). All significant intercepts occur within or directly adjacent to the 3km long CAL-01
regolith anomaly, renamed the Arrakis Prospect. A small program of shallow RC drilling was
completed to infill around air-core hole 24IWBAC0063, defining the geometry of the mineralised
structure (see ASX Release 25 February 2025).
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2
Arrakis RC Results
The follow-up RC drilling program was primarily designed to test below the intercept of 11m @ 1.7
g/t Au from 97m in 24IWBAC063, which ended in mineralisation. The deeper RC test included four
holes for 700m and follows shallow RC drilling completed in January 2025 (see ASX release 25
February 2025). Results from the RC drilling program demonstrate the presence of multiple
mineralised structures and confirm primary mineralisation continuity down dip. Notable results from
the program include:
o
11m @ 0.5 g/t Au from 168m in 25AKSL003
o
Including 3m @ 1.2 g/t Au from 174m
5m @ 1.3 g/t Au from 243m in 25IWBRC0037*1
Including 2m @ 2.7 g/t Au from 246m
*1 RC hole 25IWBRC0037 only partially tested the targeted shear zone.
Results confirm mineralisation is subvertical, and hosted within a broad interval of sheared mafic,
with higher grade zones associated with increased fine fractures and/or veining, increased silicasericite alteration and increased disseminated sulphides including pyrite and arsenopyrite (see
Appendix 1).
Several new structures were also identified in the depleted upper regolith, including:
o
9m @ 0.4 g/t Au from 54m in 25IWBRC0037
o
Including 1m @ 1.8 g/t Au from 61m
8m @ 0.4g/t Au from 105m in 25IWBRC0037
It is worth noting that the 9m @ 0.4g/t Au from 54m in 25IWBRC0037 represents the best result to
date from within the depleted upper regolith. These intercepts remain untested at depth and
present additional targets for future RC drilling (see Figure 1).
yandalresources.com.au | ASX:YRL
3
Arrakis Cross-Section
nort hwest facing
Surface
Transported Cover
BOCO
9m @ 0.4 g/t Au
3m @ 0.2 g/t Au
8m @ 0.4 g/t Au
TOFR
11m @ 1.7 g/t Au to EOH
incl. 3m @ 3.5 g/t Au
Target
Target
11m @ 0.5 g/t Au
Incl. 3m @ 1.2g/t Au
Mafic
5m @ 1.3 g/t Au
Incl. 2m @ 2.7g/t Au
Intermediate
Figure 1: Cross-section showing all drilling results from Arrakis with a simple preliminary
interpretation of geology. The section location is shown in Figure 2. The section shows all drilling
+/-50m away from the section plane.
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4
Caladan Fold
CAL-01
Regolith
Anomaly
Arrakis
Prospect
Figure 2: A collar plan over the Caladan target area, showing simplified bedrock geology
interpretation across the Caladan and northern Irulan target areas within the IWB Gold Project.
The collars of the 2024 air-core drilling, the historic 1995 RAB drilling, and all historic drilling >20m
in depth are plotted. All collars are thematically coloured by max Au (g/t Au). Also plotted are
the planned air-core drill lines for the 2025 drill program.
yandalresources.com.au | ASX:YRL
5
2025 Caladan Air-core Program
A 12,500m air-core program has been designed to test the Caladan Fold structure. Drilling will
commence in May once all line clearing is complete. The program will include:
o
Eight 800m spaced drill lines (See Figure 2);
o
Two 400m spaced lines north and south of the existing Arrakis line of
drilling;
o
Drill lines across the Caladan Fold will test approximately 6.4km of strike;
o
Initial hole spacing of 200m across each line, with closer-spaced holes
within the CAL-01 regolith anomaly and across interpreted lithological
boundaries and structures;
o
Routine bottom-of-hole multi-element sampling to be completed on all
holes;
o
All holes will be drilled at -60 ° to the southwest, with an average drill depth
of 100m assumed for the program;
o
The program will require 4-6 weeks to complete, subject to weather
delays;
o
All initial assay results are anticipated eight weeks after completion of the
drilling program.
Caladan Target Area Summary
The Caladan target area presents a large-scale northwest plunging (interpreted) fold, truncated
by the Idaho Shear to the southwest. The Idaho Shear is interpreted as a second-order structure
linking the Ockerburry Shear Zone to the east and the Barwidgee Shear Zone to the west (see
Figure 3). The only systematic drilling across the fold structure was completed in 1995 (see ASX
release 15 July 2024), where shallow (average depth of 22m) vertical RAB holes on a 400m by
400m spacing were completed. The drilling was designed to penetrate through shallow
transported cover (2-20m deep) and sample in-situ upper saprolite clays. A review of this drilling
yielded several low-level in-situ saprolite anomalies, the largest of which (the 3km long CAL-01
anomaly) is situated in the core of the Caladan Fold (see Figure 2 above).
The Caladan Fold structure is 3km wide, over 8km long, and lies under 2m to 20m of loose to
partially cemented transported cover (the average depth of transported cover is 8m). The broad
structural setting is similar to the Kalgoorlie district, where the Boulder-Lefroy Fault truncates the
folded mafic stratigraphy of the Boomerang anticline (see Figure 3).
yandalresources.com.au | ASX:YRL
6
A single line of air-core drilling completed in 2024 has confirmed:
o
Strong gold depletion in the upper portion of the regolith profile;
o
The 3km long CAL-01 anomaly is likely associated with primary mineralisation
hosted within a deformed and altered mafic unit;
o
Gravity highs coincide with fractionated dolerites, separated by a sequence
dominated by variably altered intermediate (andesite) volcaniclastics.
The under-explored nature of the Caladan Fold, combined with several low-level regolith
anomalies, resulted in the Caladan target area being ranked as one of the highest priority target
areas within the Company’s project portfolio. Recent drilling results combined with observed
geology have reaffirmed the Company’s prioritisation of the Caladan target area within the
exploration strategy.
Scale Comparison
Kalgoorlie
District
Mt Charlotte
Super
Pit
Figure 3: A scale comparison of the Caladan Fold (target area) and the Kalgoorlie district, showing
simplified bedrock geology interpretations. Kalgoorlie interpreted geology adapted from N.M. Vielreicher,
D.I. Groves, N.J. McNaughton. 2016. The giant Kalgoorlie Goldfield revisited. Geoscience Frontiers, volume
7, pp. 359-374.
yandalresources.com.au | ASX:YRL
7
Looking Ahead
The Company maintains a strong cash position and a very active June Quarter scheduled.
Notable near-term activities and news flow include;
1.
All results from the recently completed diamond drilling of the Siona discovery are
expected by mid-May;
2.
Heritage surveys across the Siona discovery and broader New England Granite target
area are scheduled for late May;
3.
The large-scale 12,500m AC program will commence across the 8km long Caladan
target area in late May;
4.
All results from the AC program are anticipated in the September Quarter.
Authorised by the board of Yandal Resources
For further information, please contact:
Chris Oorschot
Managing Director
Yandal Resources Limited
yandal@yandalresources.com.au
yandalresources.com.au | ASX:YRL
Greg Fitzgerald
Company Secretary
+61 8 9389 9021
yandal@yandalresources.com.au
8
About Yandal Resources Limited
Yandal Resources has a portfolio of advanced gold exploration projects in the highly prospective Yandal
and Norseman-Wiluna Greenstone Belts of Western Australia.
Jundee
Wiluna
Ironstone Well Barwidgee
Wiluna
Caladan
Flushing
Meadows
Mt Keith
Mt McClure
New England
Granite
Bronzewing
Kathleen Valley
Bellevue
Darlot
Leinster
Thunder Box
King of the Hills
Figure 4: Yandal Resource exploration Project locations within the Yandal Greenstone Belt.
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9
Table 1 – Yandal Resources Ltd - Mineral Resource Summary
Indicated
Inferred
Deposit
Tonnes Grade
Au
Tonnes
Grade
Au
(‘000s)
(g/t)
(oz)
(‘000)
(g/t)
(oz)
Ironstone Well
Flushing Meadows1
2,141
1.3
91,000
5,245
1.1
177,000
Mt McClure
Challenger2
718
1.9
44,000
3
Success
1,255
1.9
75,000
Parmelia4
252
2.1
17,000
5
HMS Sulphur
1010
1.2
39,000
6
Gilmore
134
1.7
7,200
Sub-total - MMC
3,369
1.7
182,200
Gordons
Gordons Dam7
365
1.7
20,000
2,141
Grand-total8
8,979
1.3
379,200
1.3
91,000
Total
Tonnes
(000’s)
Grade
(g/t)
Au
(Oz)
7,386
1.1
268,000
718
1.9
44,000
1,255
1.9
75,000
252
2.1
17,000
1010
1.2
39,000
134
1.7
7,200
3,369
1.7
182,200
365
1.7
20,000
11,120
1.4
470,200
Due to the effects of rounding, totals may not represent the sum of the individual components.
1. Reported above 0.5g/t Au lower cut-off grade; refer to Yandal Resources Ltd ASX announcement dated 4 November 2020 for full
details. 2. Reported above 1.0g/t Au lower cut-off grade; refer to Yandal Resources Ltd ASX announcement dated 22 August 2022 for full
details 3. Reported above 1.0g/t Au lower cut-off grade; refer to Yandal Resources Ltd ASX announcement dated 6 September 2022 for
full details.4. Reported above 1.0g/t Au lower cut-off grade; refer to Yandal Resources Ltd ASX announcement dated 20 September 2022
for full details 5. Reported above 0.5g/t Au lower cut-off grade within this announcement 6. Reported above 1.0g/t Au lower cut-off
grade within this announcement 7. Reported above 1.0g/t Au lower cut-off grade; refer to Yandal Resources Ltd ASX announcement
dated 6 April 2023 for full details 8. All Resources are reported as global estimates, not constrained by optimised pit shells.
Competent Person Statement
The information in this document related to Exploration Targets and Exploration Results, geology and data
compilation is based on information reviewed or compiled by Mr Christopher Oorschot, a Competent
Person who is a Member of The Australasian Institute Geoscientists. Mr Oorschot is the Managing Director
of the Company, is a full-time employee and holds shares and options in the Company. Mr Oorschot has
sufficient experience which is relevant to the style of mineralisation and type of deposit under consideration
and to the activity which he is undertaking 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
Oorschot consents to the inclusion in this announcement of the matters based on this information in the
form and context in which it appears.
The information in this announcement that relates to the Flushing Meadows, Mt McClure and Gordons Dam
Mineral Resource Estimates is based on information compiled and generated by Andrew Bewsher, an
employee of BM Geological Services Pty Ltd (“BMGS”). Both Andrew Bewsher and BMGS hold shares in
the company. BMGS consents to the inclusion, form and context of the relevant information herein as
derived from the original resource reports. Mr Bewsher has sufficient experience relevant to the style of
mineralisation and type of deposit under consideration and to the activity which is being undertaken to
qualify as a Competent Person as defined in the 2012 Edition of the JORC ‘Australasian Code for Reporting
of Exploration Results, Mineral Resources and Ore Reserves’.
YRL confirms that it is not aware of any new information or data that materially affects the information
included in the original market announcement. The company confirms that the form and context in which
the Competent Person’s findings are presented have not been materially modified from the original market
announcement.
yandalresources.com.au | ASX:YRL
10
Forward Looking Statements
This document may contain certain forward-looking statements. Forward-looking statements include, but
are not limited to, statements concerning Yandal Resources Limited’s (Yandal’s) current expectations,
estimates and projections about the industry in which Yandal operates, and beliefs and assumptions
regarding Yandal’s future performance. When used in this document, words such as “anticipate”, “could”,
“plan”, “estimate”, “expects”, “seeks”, “intends”, “may”, “potential”, “should”, and similar expressions are
forward-looking statements. Although Yandal believes that its expectations reflected in these forwardlooking statements are reasonable, such statements are subject to known and unknown risks, uncertainties
and other factors, some of which are beyond the control of Yandal, and no assurance can be given that
actual results will be consistent with these forward-looking statements. Drilling results presented indicate
geological potential for mineralisation but there can be no certainty that these results will eventually form
part of a Mineral Resource Estimate.
Table 2 – Arrakis RC collar location summary for this release.
Total
Depth
Prospect
/ Target
Hole ID
Hole
type
East
North
(m)
(mAHD)
(degrees)
(degrees)
Arrakis
25AKSL003
RC
286829
7027617
522.8
224.3
-60.7
240
Arrakis
25IWBRC0034
RC
286603
7027378
523.3
228.7
-59.5
186
Arrakis
24IWBRC0036
RC
286954
7027757
523.0
226.7
-59.9
138
Arrakis
24IWBRC0037
RC
286886
7027675
526.0
230.1
-60.2
270
(m)
RL
Azimuth
Dip
(m)
Table 3 – Arrakis Prospect - Summary of significant RC drilling assay results >0.1g/t Au with no more than
2m of continuous internal waste included unless otherwise stated. All intercept lengths are reported as
down-hole lengths.
Hole
ID
Sample
type /
Sub
From
(m)
To
(m)
Interval
(m)
Au
(g/t)
Comment
25AKSL003
1m Sample
133
137
4
0.2
Fresh rock
25AKSL003
1m Sample
160
164
4
0.5
Fresh rock
25AKSL003
1m Sample
168
179
11
0.5
Fresh rock
25AKSL003
Including
174
177
3
1.2
Fresh rock
25IWBRC0034
1m Sample
NSA
25IWBRC0036
1m Sample
NSA
25IWBRC0037
1m Sample
46
48
2
0.2
Completely weathered
25IWBRC0037
1m Sample
57
63
6
0.5
Completely weathered
25IWBRC0037
1m Sample
68
70
2
0.3
Moderately weathered
25IWBRC0037
1m Sample
105
113
8
0.4
Moderately weathered
25IWBRC0037
1m Sample
243
249
6
1.1
Fresh rock
25IWBRC0037
Including
246
248
2
2.7
Fresh rock
NSA - no significant assays.
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11
Appendix 1 – Annotated chip tray photos from Arrakis RC Program.
yandalresources.com.au | ASX:YRL
12
Appendix 2 – Ironstone Well-Barwidgee Gold Project, Irulan Air-Core Drilling & Arrakis RC Drilling
JORC Code (2012) Table 1, Sections 1 and 2
Mr Christopher Oorschot, Managing Director of Yandal Resources, compiled the information in Section 1 and Section 2 of the following JORC Table 1 and
is the Competent Person for those sections. The following Table and Sections are provided to ensure compliance with the JORC Code (2012 edition)
requirements for the reporting of Exploration Results.
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.
•
•
•
ASX Announcement 30 April 2025
Yandal Resources has completed RC drilling intermittently across a single line at the Arrakis
Prospect. The drilling involved 5.5-inch face sampling bit down to an average down-hole depth
of 208m (between 138m and 270m. Holes were drilled at an angle of -60° to the southwest.
Yandal Resources (YRL) RC drilling samples were collected via a rig-mounted static cone
splitter, splitting approximately 12.5% of the total sample volume. Two splits are collected for
each metre: a primary and duplicate sample. The primary 1m samples are then sent to a lab
for further analysis. The duplicate samples are retained on-site unless they are submitted as
routine duplicates.
Historic RAB drilling completed by Eagle Mining and Hunter Resources was detailed in the ASX
release dated 15 July 2024, the original open-file reports are referenced below:
o For historic RAB drilling completed by Eagle Mining in 1995, derived from WAMEX
Report A047408, samples were taken over discrete lithological changes of
varying lengths. Holes were terminated once a recognisable saprolitic horizon
was intercepted.
o For historic RAB drilling completed by Hunter Resources in 1995, derived from
WAMEX Report A047408, samples were collected as 4m composites from the
transported/residual interface to the bottom of the hole.
Page 13
Criteria
JORC Code explanation
Commentary
Include reference to measures taken to ensure sample
representivity and the appropriate calibration of any
measurement tools or systems used.
•
•
For YRL RC drilling, the cone splitter is regularly cleaned and inspected. The 1m bulk samples
are laid out in drill order. These bulk samples are regularly inspected for contamination, and
the volume of the bulk sample is monitored. These bulk samples are retained until all results are
received and may be used to collect additional field duplicates to verify lab results, logged
geology or any other form of analysis. If the bulk sample appears visually low in volume or
weight, this is recorded with the sample details. The same applies to damp or wet samples.
Two splits are collected for each drilled metre: a primary and a secondary sample. The
Secondary sample is retained on-site and may be used to collect additional field duplicates
to verify lab results, logged geology or any other form of analysis
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.
•
RC drilling was used to obtain 1m samples from which a portion, between 1-5kg in weight, was
dispatched to one of the two following labs:
o Aurum Laboratories Pty Ltd: samples were crushed and pulverised to produce a
50g charge for fire assay with an AAS (atomic absorption spectroscopy) finish for
gold determination with a 0.01ppm detection limit.
o Intertek Minerals: samples were crushed and pulverised to produce a 50g charge
for lead collection fire assay with OES (Optical Emission Spectroscopy) finish for
gold determination with a 0.005ppm detection limit.
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).
•
For YRL RC drilling, a 139mm diameter face sampling bit and hammer was used.
Drill sample
recovery
Method of recording and assessing core and chip sample
recoveries and results assessed.
•
For YRL holes, RC drilling recoveries are visually assessed by the supervising geologist, and any
low-volume or weight samples are recorded, along with any damp or wet samples. Drill depths
are routinely verified at the completion of each drill rod (every 6m). The cone splitter is checked
for each drill site to ensure it is completely upright and level. Sample collection from the splitter
by drilling off-siders is monitored for any inefficiencies.
Within the limited drilling completed, there appears to be no correlation between sample
Measures taken to maximise sample recovery and ensure
representative nature of the samples.
ASX Announcement 30 April 2025
•
Page 14
Criteria
JORC Code explanation
Commentary
recovery and sample grade.
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.
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.
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.
•
•
•
•
•
•
For YRL drilling, all RC holes have been logged in full by a qualified and experienced geologist.
RC chips and fines from each 1m interval drilled are inspected and logged for colour,
weathering, lithology, deformation, veining and sulphide species. All 1m samples are sieved
and retained in labelled and annotated chip trays. Chip trays are transported to Perth for longterm storage and are available for review. The quality of logging information is considered
sufficient to support Mineral Resource Estimation studies.
Data captured through geological logging by a geologist is qualitative in nature.
In addition to geological logging, the magnetic susceptibility of each interval is measured using
a KT-10 magnetic susceptibility metre, with a sensitivity of 1x10-6 SI Units. Magnetic susceptibility
readings are quantitative in nature.
YRL RC drilling utilised a rig-mounted cone splitter installed directly below and in line with the
rig-mounted cyclone. Two 1-5kg sub-samples are collected into calico bags labelled with a
unique alpha-numeric ID. Most samples collected were dry; if samples were damp or wet, this
was noted in the sample records.
For all YRL RC drilling, samples are dried at 100°C to constant mass, crushed to <10mm and
pulverised to nominally 85%, passing 75µm.
Field duplicates were collected at an initial rate of 1 duplicate for every 50 samples collected.
Standards and blanks were routinely inserted into the sample sequence
For labs used by YRL, internal lab quality control measures include lab duplicates and the
insertion of lab standards and blanks.
Sample sizes are appropriate given the fine-to-medium-grained nature of the sampled
material.
Whether sample sizes are appropriate to the grain size of
the material being sampled.
ASX Announcement 30 April 2025
Page 15
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 (e.g.
standards, blanks, duplicates, external laboratory checks)
and whether acceptable levels of accuracy (i.e. lack of
bias) and precision have been established.
•
•
•
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.
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.
•
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Specification of the grid system used.
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ASX Announcement 30 April 2025
For YRL RC drilling, samples were assayed at the following labs using the following methods:
o Aurum Laboratories in Beckenham, Western Australia, assayed using a 50g fire
assay with AAS (atomic absorption spectroscopy) finish for gold analysis with a
0.01ppm detection limit.
o Intertek Minerals in Maddington, Western Australia, assayed using a 50g charge
for lead collection fire assay with OES (Optical Emission Spectroscopy) finish for
gold determination with a 0.005ppm detection limit.
o Both are considered a total digest and appropriate for the targeted style of
mineralisation.
Magnetic susceptibility measurements were taken every meter using a KT-10 V2 instrument with
a sensitivity of 1x10-6 SI Units.
YRL QAQC field protocols include the insertion of commercially prepared certified reference
material (CRM) and blank material at a rate of approximately 1 CRM/blank for every 20
samples collected. CRMs used are unidentifiable by the lab when received. QAQC
performance is monitored upon receipt of each batch of results and re-assessed once all
samples for a program are received.
Laboratory QA/QC protocols involve inserting internal lab standards using CRMs, blanks,
repeat analysis of pulps and screen tests (the percentage of pulverised material passing 75µm
mesh). Laboratory QAQC results are reported with each batch. Laboratory QAQC
performance is monitored upon receipt of each batch of results and assessed again once all
samples for a program are received.
Significant intercepts from YRL RC drilling are verif
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