REG - Greatland Resources - West Dome Underground Project Update
27/11/2025 07:05
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RNS Number : 2579J Greatland Resources Limited 27 November 2025
Greatland Resources Limited
E: info@greatland.com.au
W: https://greatland.com.au
: x.com/greatlandgold
NEWS RELEASE | 27 November 2025
West Dome Underground Project Update
THIS ANNOUNCEMENT CONTAINS INSIDE INFORMATION AS STIPULATED UNDER THE UK
MARKET ABUSE REGULATIONS. ON PUBLICATION OF THIS ANNOUNCEMENT VIA A
REGULATORY INFORMATION SERVICE, THIS INFORMATION IS CONSIDERED TO BE IN THE
PUBLIC DOMAIN.
West Dome Underground project continues to expand with ongoing drilling
revealing a growing opportunity
Wide, high grade results from Western Stockwork Corridor, adjacent to the
existing high grade Western Limb and Eastern Limb
Highlights
§ 19 holes for >9,000 metres completed from the West Dome Underground
(WDU) Phase 2 drilling program, with results received from 9 holes. The
drilling program has largely focused on growth drilling for H1 FY26, targeting
the southern extension of mineralisation.
§ Increasing drill density has improved our understanding of the WDU, with
three mineralised domains now confirmed: a broad sub-vertical Western
Stockwork Corridor (WSC), flanked by the extensive Western Limb and Eastern
Limb high grade shoots hosted within the Lower Limey Unit (LLU), an important
geological horizon for gold-copper mineralisation at Telfer.
§ Recent drilling has returned exceptional drilling results in the WSC domain
over a broad zone of stockwork mineralisation, with results across a large
zone between 40-70m wide (true width) and over 200m down dip extent:
- 56.6m @ 2.24g/t Au & 1.26% Cu (127 gram-metres Au (gm)(1)) from 337m
(WUC4550083)
- 82.2m @ 1.90g/t Au & 0.31% Cu (156gm) from 360.7m (WUC4550092)
- 66.5m @ 1.18g/t Au & 0.16% Cu (78gm) from 334m (WUC4550085)
- 24.0m @ 1.18g/t Au & 0.10% Cu (28gm) from 309m (WUC4550081)
- 22.5m @ 1.43g/t Au & 0.01% Cu (32gm) from 396m (WUC4550099(2))
§ In addition, high grade mineralisation continues to be intercepted within
the LLU across both the Eastern Limb and Western Limb, with mineralisation on
both limbs now over 500m in strike and remain open. The following significant
results have been received to date:
Western Limb LLU
- 34.5m @ 4.06g/t Au & 0.31% Cu (140gm) from 418.5m (WUC45500992)
- 29m @ 1.86g/t Au & 0.34% Cu (54gm) from 341m (WUC4550081)
- 5.5m @ 3.57g/t Au & 0.29% Cu (20gm) from 389m (WUC4550083)
- 6.84m @ 2.28g/t Au & 0.25% Cu (17gm) from 440m (WUC455009(2))
- 7.15m @ 2.32g/t Au & 0.13% Cu (15gm) from 416m (WUC4550085)
Eastern Limb LLU
- 35m @ 2.9g/t Au & 0.19% Cu (101gm) from 234m (WUC4550099(2))
- 30m @ 5.6g/t Au & 0.25% Cu (168gm) from 281m (WUC4550099(2))
- 26.6m @ 2.7g/t Au & 0.30% Cu (71gm) from 302m (WUC4550111(2))
- 6.7m @ 1.88g/t & 0.39% Cu (12gm) from 154m (WUC4550083)
- 3.85m @ 4.1g/t Au & 0.38% Cu (16gm) from 168m (WUC4550092)
§ Development and study work:
- Existing Telfer infrastructure supports the potential to accelerate a new
mine at WDU, with the ability to utilise the existing Main Dome Underground
(MDU) infrastructure that previously supported an underground mining rate in
excess of 5Mtpa (Main Dome Underground mining rate currently approximately
1.2Mtpa).
- A pre-feasibility study is underway and will assess utilisation of the
existing MDU infrastructure, including the existing ventilation system,
underground haulage shaft and crusher system.
- Second development drive is approximately 60% of the distance to the
current drilling location. Once complete, the second drive will provide
significant optionality to further increase drilling activities and advance
any early works.
§ A third diamond drill has been allocated to the West Dome Underground, to
accelerate drilling and support delivery of a maiden Mineral Resource Estimate
targeted for the March 2026 quarter.
Notes:
(1) Formula: gm = interval width multiplied by Au grade
(2) Result reported in the announcement "September Quarter Resource
Development & Exploration Update
(https://app.sharelinktechnologies.com/announcement-preview/asx/8c32d17ff47162f34db951eeda8edfb5)
" on 22 October 2025
Greatland Managing Director, Shaun Day, commented:
"We continue to see excellent drilling results and progress at the compelling
West Dome Underground project.
"The Main Dome Underground began production almost 20 years ago and continues
operating today, having produced more than 3 million ounces of gold to date.
Our West Dome Underground drilling confirms that key geological units and
mineralisation styles at the Main Dome Underground are present at the West
Dome Underground, and continues to deliver high grades and excellent widths.
"Access to the West Dome Underground effectively opens access to a new
quartile of the Telfer mine, being the two open pits and potentially the
opportunity to start a second underground mine.
"Drilling to date has now identified three separate mineralised domains, the
high grade Western Limb and Eastern Limb, and the wide sub-vertical Western
Stockwork Corridor. Mineralisation remains open along strike and down dip.
Given the impressive results to date, a third diamond drilling rig has been
allocated to the West Dome Underground, which will further inform a targeted
maiden Mineral Resource estimate in the March 2026 quarter.
"The second development drive to the West Dome Underground is well progressed,
and a pre-feasibility study is now underway and will assess how the
substantial existing infrastructure capacity at the Main Dome Underground can
be leveraged to deliver a pathway to production."
Overview
Greatland Resources Limited (Greatland) is pleased to provide this update on
the West Dome Underground project.
The FY26 WDU drilling program aims to continue to expand the mineralisation
footprint while at the same time infilling existing drilling to an adequate
spacing (40m x 40m) to support Mineral Resource estimation and subsequent
mining studies to support a decision to mine.
Drilling has initially focused on the less drilled southern extent of the
mineralised system, with results to date indicating an increase in grade and
thickness within the Eastern Limb and sub-vertical WSC, while continuing to
confirm the high-grade mineralisation seen within the Western Limb during
previous drilling programs.
Drilling will progress northwards over the remainder of FY26, with a further
22,500m of drilling planned to continue to infill existing drilling along with
testing vertical extent of the system (above and below the LLU).
The maiden Mineral Resource estimate is targeted in the March 2026 quarter. In
the meantime, based on the impressive results to date a number of workstreams
are underway to progress the potential development of the WDU as an additional
high grade ore source.
Figure 1: Telfer Deposit mine area Location Map
Drilling Results Discussion
Western Stockwork Corridor
The WSC mineralisation is located within the hinge of the WDU fold (Figure 2)
and consists of a broad zone of concordant and discordant stockwork/sheeted
and breccia veins, containing chalcopyrite, pyrite, white & pink dolomite,
quartz and galena. There is also a notable overprinting of albite alteration.
The potential of this domain was first identified during the maiden
underground drilling campaign, which although focused on the high-grade
Western Limb also intercepted several broad zones of stockwork mineralisation
within the hinge of the LLU fold with the following promising results:
§ 42.0m @ 1.97 g/t Au & 0.49% Cu (83gm) from 294.0m (WUC4550019(3))
§ 18.4m @ 3.93 g/t Au & 0.92% Cu (72gm) from 330.6m (WUC4550020(3))
§ 36.1m @ 2.14 g/t Au & 0.21% Cu (77gm) from 365.9m (WUC4550023(3))
§ 31.7m @ 1.34 g/t Au & 0.35% Cu (42gm) from 366.0m (WUC4550022(3))
§ 23.3m @ 1.64 g/t Au & 0.54% Cu (38gm) from 341.0m (WUC4550030(3))
Recent drilling to the south (Figure 2) has continued to return multiple
intercepts of broad higher-grade mineralisation within the WSC, with the
following significant results received:
§ 56.6m @ 2.24g/t Au & 1.26% Cu (127gm) from 337m (WUC4550083)
§ 82.2 @ 1.90g/t Au & 0.31% Cu (156gm) from 360.7m (WUC4550092)
§ 66.5m @ 1.18g/t Au & 0.16% Cu (78gm) from 334m (WUC4550085)
§ 24.0m @ 1.18g/t Au & 0.10% Cu (28gm) from 309m (WUC4550081)
§ 22.5m @ 1.43gt Au & 0.01% Cu (32gm) from 396m (WUC4550099(2))
The drilling to date confirms continuous WSC mineralisation over 700m of
strike, averaging approximately 40m wide (true width) x 150m dip extent
(height), and remains open along strike, and up and down dip. These recent
results indicate higher grade and increased width to the south of the Phase 1
drilling.
The WSC is considered comparable to the Vertical Stockwork Corridor or 'VSC'
domain that was one of the dominant domains targeted by the Sub-Level Cave
(SLC) at the Telfer Main Dome Underground from 2008 to 2019 (mining
approximately 5Mtpa on average) and is a key extension opportunity currently
under assessment.
Note (3): Result reported in the Greatland Gold plc AIM announcement "West
Dome Underground Project
(https://polaris.brighterir.com/public/greatland_gold/news/rns/story/x56qd0r)
" on 20 February 2025
Western Limb
The Western Limb of LLU mineralisation has returned some of the highest grade
WDU results to date, and continues to do so. Mineralisation has been confirmed
over 700m in strike, averaging 10m wide and over 100m down dip to date, and
remains open to the north and south.
The following recent significant results have been returned:
§34.5m @ 4.06g/t Au & 0.31% Cu (140gm) from 418.5m (WUC4550099(2))
§ 29m @ 1.86g/t Au & 0.34% Cu (54gm) from 366m (WUC4550081)
§ 5.5m @ 3.57g/t Au & 0.29% Cu (20gm) from 389m (WUC4550083)
§ 7.15m @ 2.32g/t Au & 0.13% Cu (17gm) from 416m (WUC4550085)
§ 6.84m @ 2.28g/t Au & 0.25% Cu (16gm) from 447m (WUC4550092)
Eastern Limb
The Eastern Limb mineralisation is hosted with the same LLU unit that has
hosted the Western Limb and has been defined over 500m in strike, 100m dip
extents and averaging 10m true width (Figure 2).
As reported in the announcement "September Quarter Resource Development &
Exploration Update" on 22 October 2025, recent drilling results have returned
higher grade mineralisation in this Eastern Limb as we have drilled to the
south, with recent results returning similar grades to those seen in the
Western Limb.
The following recent significant results have been returned:
§ 35m @ 2.9g/t Au & 0.19% Cu (101gm) from 234m (WUC45500991)
§ 30m @ 5.6g/t Au & 0.25% Cu (168gm) from 281m (WUC45500991)
§ 26.6m @ 2.7g/t Au & 0.30% Cu (71gm) from 302m (WUC45501111)
§ 6.6m @ 1.88g/t Au & 0.39% Cu (12gm) from 154m (WUC4550083)
§ 3.85m @ 4.1g/t Au & 0.38% Cu (16gm) from 168m (WUC4550092)
§ 4.75m @ 1.68g/t Au & 0.13% Cu (8gm) from 155m (WUC4550081)
§ 12.6m @ 1.39g/t Au & 0.13% Cu (17.5gm) from 209.4m (WUC4550102)
Figure 2: West Dome Underground "3D Isometric view" looking north
Figure 3: West Dome Underground Geological Type Section
Main Dome Underground infrastructure
The MDU is situated below the Main Dome Open Pit, and to date has mined over
75Mt of ore, for more than 3.1Moz gold and 210kt copper.
In 2007, construction of a 6Mtpa capacity underground crusher, dual conveyor,
shaft and hoist was completed and has been in continuous use since then. The
MDU mainly operated as a sub level cave from 2008 to 2019, extracting on
average 5Mtpa, before the mine moved to long hole open stoping.
Currently the Main Dome Underground is operating at a mining rate of
approximately 1.2Mtpa. Accordingly, there is significant available
infrastructure capacity at the MDU to support potential mining operations at
WDU, including:
§ 6Mtpa crushing and haulage capacity via the existing shaft. The crusher
is located at a depth of approximately 1,000m and would be accessible from WDU
by development of a ~1.5km lateral haulage drive;
§ Water pumping infrastructure with installed capacity of 132L/s, with
current mining activities in the MDU utilising on average 50L/s;
§ Ventilation infrastructure designed for ~5Mtpa SLC, currently operating
as a ~1.2Mtpa stoping operations;
§ Electricity generation from the Telfer power plant and transmission via
the MDU; and
§ Paste plant.
Figure 4: MDU shaft headframe (left), underground conveyor system (right)
Figure 5: MDU water pumping station (left) and paste plant (right foreground)
Development and study work
The current drilling program is on track to inform a maiden Mineral Resource
estimate targeted in the March 2026 quarter and provide input into
metallurgical and geotechnical test work.
The second parallel development drive from MDU to WDU has now been developed
to a length of approximately 1,100 metres, providing a primary ventilation
loop and is approximately 60% of the way to the existing diamond drill
location, which sits 200-300m from the WDU mineralisation. This drive will
facilitate greater rates of exploration drilling and the option to accelerate
early works development.
A pre-feasibility study for WDU is underway, with metallurgical, hydrogeology,
and geotechnical testwork program scheduled in H2 FY26. The study will assess
the utilisation of the existing MDU infrastructure, along with key
infrastructure components such as upgrading the existing paste plant (Figure 5
above), and the tailings supply options for paste backfill. It will also
consider processing optimisation with future Havieron ore.
Contact
For further information, please contact:
Greatland Resources Limited
Shaun Day, Managing Director | Rowan Krasnoff, Chief Development Officer
info@greatland.com.au (mailto:info@greatland.com.au)
Nominated Advisor
SPARK Advisory Partners
Andrew Emmott / James Keeshan / Neil Baldwin | +44 203 368 3550
Corporate Brokers
Canaccord Genuity | James Asensio / George Grainger | +44 207 523 8000
RBC Capital Markets | James Agnew / Jamil Miah | Scott Redwood |
+44 207 029 0528
Media Relations
Australia - Fivemark Partners | Michael Vaughan | +61 422 602 720
About Greatland
Greatland is a gold and copper mining company listed on the Australian
Securities Exchange and London Stock Exchange's AIM Market (ASX:GGP and
AIM:GGP) and operates its business from Western Australia.
The Greatland portfolio includes the 100% owned Telfer mine, the adjacent 100%
owned brownfield world-class Havieron gold-copper development project, and a
significant exploration portfolio within the surrounding region. The
combination of Telfer and Havieron provides for a substantial and long life
gold-copper operation in the Paterson Province in the East Pilbara region of
Western Australia.
Forward Looking Statements
This document includes forward looking statements and forward looking
information within the meaning of securities laws of applicable jurisdictions.
Forward looking statements can generally be identified by the use of words
such as "may", "will", "expect", "intend", "plan", "estimate", "anticipate",
"believe", "continue", "objectives", "targets", "outlook" and "guidance", or
other similar words and may include, without limitation, statements regarding
estimated reserves and resources, certain plans, strategies, aspirations and
objectives of management, anticipated production, study or construction dates,
expected costs, cash flow or production outputs and anticipated productive
lives of projects and mines.
These forward looking statements involve known and unknown risks,
uncertainties and other factors that may cause actual results, performance and
achievements or industry results to differ materially from any future results,
performance or achievements, or industry results, expressed or implied by
these forward-looking statements. Relevant factors may include, but are not
limited to, changes in commodity prices, foreign exchange fluctuations and
general economic conditions, increased costs and demand for production inputs,
the speculative nature of exploration and project development, including the
risks of obtaining necessary licences and permits and diminishing quantities
or grades of reserves, political and social risks, changes to the regulatory
framework within which Greatland operates or may in the future operate,
environmental conditions including extreme weather conditions, recruitment and
retention of personnel, industrial relations issues and litigation.
Forward looking statements are based on assumptions as to the financial,
market, regulatory and other relevant environments that will exist and affect
Greatland's business and operations in the future. Greatland does not give any
assurance that the assumptions will prove to be correct. There may be other
factors that could cause actual results or events not to be as anticipated,
and many events are beyond the reasonable control of Greatland. Forward
looking statements in this document speak only at the date of issue. Greatland
does not undertake any obligation to update or revise any of the forward
looking statements or to advise of any change in assumptions on which any such
statement is based.
Competent Persons Statement
Information in the report pertaining to exploration results has been reviewed
and approved by Mr Michael Thomson, a Member of the Australian Institute of
Geoscientists (AIG), who has more than 20 years relevant industry experience.
Mr Thomson, an employee of the Company, has sufficient experience relevant
to the style of mineralisation, type of deposit under consideration, and to
the activity which he is undertaking to qualify as a Competent Person as
defined by the 2012 Edition of the Australasian Code for Reporting of
Exploration Results, Mineral Resources and Ore Reserves (the JORC Code) and
under the AIM Rules - Note for Mining and Oil & Gas Companies, which
outline standards of disclosure for mineral projects. Mr Thomson consents
to the inclusion in this announcement of the matters based on this information
in the form and context in which it appears.
Drillhole Data and Au- Cu Significant Intersections
Reporting Criteria: Intercepts reported are downhole drill width (not true
width) Au >0.50ppm (0.5g/t Au) and minimum 1m downhole width with maximum
consecutive internal dilution of 5m. Average grades are based on
length-weighting of samples grade, and only those intercepts with a gram
metres (Au_ppm x length) above 10 gram metres have been reported. Gold and
copper grades are reported to two significant figures, the downhole lengths
are rounded to 0.1m which may cause some apparent discrepancies in interval
widths. Underground samples are from core drilling which is NQ2 in diameter
while open pit samples are from reverse circulation (RC) drilling.
Table 1: WDU New significant intercepts & drilling data (Mine Grid)
WUC4550081 58782 13067 4421 13.52 272.7 411.5 155 159.75 4.8 1.68 0.13 8
309 333 24.0 1.18 0.09 28
341 369 28.0 1.85 0.35 52
WUC4550082 58782 13065 4422 9.17 267.8 397.7 233.5 243 9.5 1.37 0.05 13
WUC4550083 58782 13066 4421 16.65 268.1 466.3 154.65 161.31 6.7 1.88 0.39 12
335 391.64 56.6 2.28 1.23 129
391.64 397.15 5.5 3.66 0.28 20
WUC4550085 58782 13066 4421 16.65 268.1 466.3 334 400.5 66.5 1.17 0.16 78
416.03 423.18 7.2 2.32 0.13 17
WUC4550092 58783 13053 4421 21.12 263.7 534.7 167.77 171.62 3.8 4.13 0.38 16
358 440.2 82.2 1.90 0.31 156
440.24 447.1 6.9 2.28 0.26 16
WUC4550098 58783 13044 4422 8.32 251.1 450 322.5 335.73 13.2 0.91 0.03 12
WUC4550099 58782 13044 4421 12 243 472.5 281 311 30.0 5.58 0.25 167
234 269 35.0 2.91 0.19 102
327.7 329 1.3 11.62 0.09 15
396 453 57.0 3.02 0.19 172
396* 418.5 22.5 1.43 0.01 32
418.5* 453 34.5 4.06 0.31 140
359 361 2.0 7.24 0.00 14
WUC4550111 58783 13030 4422 329 14.0 233 302.3 329 26.6 2.69 0.30 72
WUC4550102 58784 13036 4422.178 7.9 249.8 508.5 209.4 222 12.6 1.39 0.13 17
(*) Note these intercepts area subset of a larger interval the precede them.
Table 2: Historical WDU significant intercepts & drilling data (Mine
Grid)
UG Ph1 WUC4550007 58771 13138 4421 303 6 380 107 109.2 2.2 2 0.43 4
114.7 121 6.3 3.14 0.11 20
126 128.5 2.5 4.24 0.04 11
259 318 59 2.83 0.71 167
360.3 362.3 2.1 2.09 0.83 4
UG Ph1 WUC4550008 58771 13138 4421 295.3 13 410 131 136.7 5.7 1.01 0.06 6
266 276 10 0.64 0.05 6
311 319 8 0.6 0.07 5
328 334.4 6.4 3.87 0.05 25
UG Ph1 WUC4550009A 58771 13137 4421 289.2 -2 318 132.1 144.7 12.6 1.6 0.07 20
151 188 37 1.27 0.05 47
268.6 291.3 22.7 2.71 1.43 62
UG Ph1 WUC4550010 58772 13138 4421 312 12 400 102.6 109.5 6.8 6.88 0.39 47
UG Ph1 WUC4550012 58772 13138 4421 321.5 1.5 430 126.7 130 3.3 1.9 0.6 6
278 287.3 9.3 5.44 1.41 51
341 353.3 12.3 3.17 0.83 39
Incl 323.5 336 12.5 3.71 1.03 46
430 370 375 5 6.68 0.03 33
384.9 389 4.1 0.56 0.91 2
UG Ph1 WUC4550013 58771 13136 4420 295.2 6 380 112 116.6 4.6 1.49 0.02 7
286.6 301.8 15.2 3.31 3 50
323 324 1 7.87 0.65 8
354.5 377.4 22.9 0.65 0.11 15
UG Ph1 WUC4550016 58770 13105 4420 341.2 4 354 152.3 161 8.7 0.75 0.05 7
179 180 1 5.37 0 5
223.2 237 13.9 2.83 0.28 39
300.2 321 20.9 4.27 2.77 89
344.4 344.8 0.4 17.6 5.91 7
UG Ph1 WUC4550017 58770 13105 4421 274.7 -1 155 drillhole failed to reach target
UG Ph1 WUC4550018 58770 13105 4420 278.5 21 423 175 183 8 1.27 0.1 10
198 206.5 8.5 0.63 0.6 5
294 325 31 1.18 0.38 37
376 382.5 6.5 1.05 0.25 7
UG Ph1 WUC4550019 58770 13104 4420 281 11 390 269 287.1 18.1 1.53 0.08 28
294 336 42 1.97 0.49 83
UG Ph1 WUC4550020 58770 13105 4420 274.6 14 428 272.9 282.9 10 0.64 0.09 6
305.8 315 9.2 2.01 0.15 18
330.6 349 18.4 3.93 0.92 72
UG Ph1 WUC4550021 58771 13114 4420 274.6 14 429 113.7 121 7.3 0.55 0.47 4
308 318.5 10.5 0.51 0.51 5
UG Ph1 WUC4550022 58771 13113 4420 289.5 6.5 400 121.7 128.2 6.6 1.64 1.14 11
159.9 161.3 1.4 7.16 0.07 10
228.7 234 5.3 0.87 0.09 5
290.4 304.7 14.3 9.06 8.57 130
347.5 352.6 5.1 1.39 1.18 7
366 397.7 31.7 1.34 0.35 42
UG Ph1 WUC4550023 58784 13038 4422 248.5 11.5 516 53 54 1 11.4 0.13 11
205 212.5 7.4 1.23 0.31 9
317.3 329.7 12.5 5.08 0.52 64
365.9 402 36.1 2.14 0.21 77
408 416 8 3.6 0.5 29
UG Ph1 WUC4550030 58783 13063 4421 270.6 14 429 147 164 17 0.54 0.13 9
182.8 188.7 5.9 1.04 0.61 6
319 325 6 1.02 0.01 6
341 364.3 23.3 1.64 0.54 38
370 381.8 11.8 2.09 0.15 25
UG Ph1 WUC4550032 58783 13062 4422 267.4 9.8 425 117 118 1 27.3 0.02 27
157.5 163 5.5 1.92 0.06 11
171.1 181 9.9 0.55 0.07 5
282.3 294 11.7 0.86 0.01 10
305.5 326.4 20.9 4.07 0.49 85
336.9 360 23.1 1.13 0.49 26
399 408 9 2.91 0.24 26
421.1 423 1.9 5.24 1.12 10
UG Ph1 WUC4550035 58783 13062 4422 261 11.3 460 163.8 169.4 5.7 1.17 0.21 7
213.5 221 7.5 0.73 0.04 5
246 246.5 0.5 28.8 0.02 14
266 286 20 2.47 0.03 49
326.7 349 22.3 2.41 1.66 54
354.6 355.2 0.6 5.87 2.48 4
361 367 6 3.37 0.26 20
374 386.1 12.1 0.92 0.64 11
407 407.3 0.3 32.2 0.85 10
426.6 436 9.4 0.51 0.07 5
UG Ph1 WUC4550040 58771 13104 4420 276 3.5 376 140.9 142.9 2 10.01 0.07 20
203 230 27 0.7 0.22 19
268 279 11 1.72 0.86 19
284.7 316.3 31.6 3.09 0.6 98
UG Ph1 WUC4550041 58771 13138 4421 299.4 2.5 370 114 122.4 8.4 1.23 0.07 10
190 191 1 6.82 0.01 7
291 305 14 2.55 1.13 36
348.7 364 15.3 0.71 0.37 11
Historic WRC34101 59013 13417 5519 229 77 1543 1497 1504 7 1.27 0.04 9
Historic WRC33404W1 58528 13351 5372 183.5 70.5 1243 903.8 915.7 11.9 1.5 0.01 18
922 923.2 1.1 5.7 0.08 6
931.8 946 14.2 0.93 0.13 13
957.1 958.1 1 7.41 3.45 7
972.9 983 10.1 3.91 0.02 39
1076.7 1091 14.3 0.45 0.06 6
1152 1157.7 5.8 0.75 0.11 4
Historic WRC32801A 57649 13289 5512 94 80.5 1870 1156.7 1164.5 7.8 0.56 0.16 4
1681.7 1689.1 7.4 1.38 1.6 10
1695.9 1702 6.2 0.58 0.5 4
1713.7 1721 7.3 0.71 0.78 5
1721.1 1722.4 1.3 8.96 4.39 12
1730.7 1734 3.3 1.96 0.1 6
1768 1787 19 0.7 0.61 13
1796.5 1810.5 14 1.17 0.28 16
1844.9 1867 22.1 1.06 0.08 23
Historic WRC30582W1 58761 13037 5439 262 87 1679 883 884 1 13.6 1.46 14
1611 1612 1 6.36 0.51 6
1390 1396.6 6.6 0.9 0.09 6
1252 1256 4 1.32 0.07 5
1362.5 1377 14.5 0.76 0.09 11
1546 1559 13 0.77 0.08 10
1420 1424 4 1.35 0.11 5
Historic WRC28605B 59234 12825 5521 262 72.1 1702 1357.5 1370 12.5 1.87 0.31 23
1389 1417 28 0.29 0.09 8
1541 1551.3 10.3 0.37 0.18 4
1565 1577 12 1.18 0.59 14
1601.5 1609 7.5 1.25 0.1 9
Historic WRC28048W4 59265 12799 5521 216.25 71.88 1776 1414 1415 1 15.67 0.03 16
1499.8 1511.8 12 0.39 0.05 5
1636 1641.6 5.6 2.86 0.03 16
1657 1669.5 12.5 1.6 0.22 20
1753.7 1756 2.3 3.17 0.08 7
Historic WRC28048W2 59265 12799 5521 216 70 1801 1286 1286.5 0.5 11.64 0.06 6
1592 1602 10 1.37 0.32 14
1614.6 1621.3 6.7 1.45 0.26 10
1645.9 1653 7.1 2.97 0.25 21
Historic WRC28048W1 59265 12799 5521 216 70 1670 1626 1648 22 0.38 0.05 8
859 860 1 5.62 0.02 6
1130.6 1136.8 6.2 1.48 0.03 9
1321 1329 8 16.03 0.23 128
1335 1336 1 5.7 0.05 6
1353.6 1356 2.4 1.98 0.09 5
1390.7 1400 9.3 0.54 0.28 5
1528 1531 3 1.73 0.08 5
Historic WRC31558 58150 13150 5517 90 85 1850 1195.2 1228 32.8 2.05 0.48 67
1274 1287.9 13.9 0.9 0.57 13
1299.7 1307 7.3 0.54 0.91 4
1404.8 1407.8 3 1.64 0.42 5
1519.2 1523.3 4 4.89 0.74 20
1542.4 1549.5 7.1 0.58 0.16 4
1595.8 1596.5 0.8 7.2 0.73 6
1669.6 1679 9.4 1.33 0.25 13
Historic WRC33901 58118 13394 5517 89 75.5 1330 1050.3 1060.1 9.8 1.57 0.18 15
1050.3 1060.1 9.8 1.57 0.18 15
1090.3 1111 20.8 0.65 0.13 14
1090.3 1111 20.8 0.65 0.13 14
1119 1129.1 10.1 0.73 0.27 7
1119 1129.1 10.1 0.73 0.27 7
1216 1235.3 19.3 2.03 0.06 39
1216 1235.3 19.3 2.03 0.06 39
Historic WRC31561 58831 13150 5485 270 -70 1713 1170.4 1175.3 4.9 1.56 1.36 8
1190 1200 10 0.9 0.28 9
1266.1 1269 2.9 1.46 0.28 4
1290.2 1290.7 0.6 58.5 0.08 35
Historic WRC34081 58068 13422 5515 90 85 1519 891 908 17 1.08 0.05 18
1182 1189 7 0.97 0.04 7
1216 1219.1 3.1 0.96 1.67 3
1225.7 1246.1 20.4 5.17 0.39 105
1482 1489 7 1.57 0.04 11
Historic W32736W1 57952 13254 5524 90 85 1411 762 764 2 4.29 0.13 9
771 781 10 0.94 0.14 9
941.9 949 7.1 0.88 0.04 6
1231 1238 7 1.82 0.22 13
1256 1283.1 27.1 1.31 0.76 36
1291.4 1293 1.6 1.56 1.81 2
Historic W27563W1 57964 12751 5528 80 -85.3 1479 1091 1109.1 18.1 0.78 0.01 14
1285 1301.2 16.2 1.52 0.16 25
1318 1346 28 0.96 0.16 27
Historic WRC30070 57965 13044 5512 94 -85 1509 694.3 699.6 5.3 13.48 0.14 71
718.9 736 17 2.05 0.31 35
744.7 749.2 4.6 0.96 0.66 4
847.5 851 3.5 3.01 0.26 11
980.9 992 11.1 1.02 0.04 11
1024.3 1033.4 9 3.65 0.03 33
1041.9 1073 31.1 0.85 0.03 26
1093 1104 11 0.5 0.03 6
1291 1326 35 3.3 0.24 116
1334 1342 8 0.54 0.1 4
1375 1377.9 2.9 0.76 1.06 2
1403 1413.6 10.6 1.93 0.95 20
1441.8 1454 12.2 1.47 0.13 18
1481.3 1487 5.8 2.14 0.15 12
Historic W30070W1 57965 13044 5512 94 -85 1520 844 854.4 10.4 0.86 0.06 9
877 879 2 3.49 0.01 7
889 892 3 1.74 0.01 5
983.1 993 9.9 0.78 0.06 8
1024 1055.4 31.4 0.85 0.02 27
1109 1114.9 5.9 1.16 0.05 7
1190.4 1191.4 0.9 12.52 0.01 11
1261 1274 13 2.06 0.67 27
1284.3 1305 20.7 1.65 0.49 34
Historic W31567W1 57944 13158 5524 90 -85 1639 975 983 8 0.97 0.01 8
988.6 998 9.4 0.6 0 6
1050.7 1082 31.3 4.43 0.03 139
1214 1221 7 0.94 0.17 7
1306.1 1363 57.1 1.14 0.3 65
1353 1362.8 9.8 0.53 0.21 5
1390.8 1452.4 61.6 1.45 0.46 89
1472.2 1475 2.8 0.69 1.96 2
1533.9 1537 3.1 9.58 1.02 30
1553.8 1558 4.2 0.88 0.81 4
1575.6 1590 14.4 1.73 0.18 25
Historic WRC29044 57964 12904 5530 90 -85 1550 1100 1101 1 5.59 0 6
1100 1110 10 1.06 0.01 11
1119 1142 22.6 0.93 0 21
1177 1230 53 1.32 0.06 70
1200 1201 1 5.98 0.04 6
1212 1214 2 15.08 0.16 30
1226.9 1228 1.2 5.42 0.14 7
1292 1297 5 1.59 0.04 8
1319.7 1321 1.4 21.56 0.1 30
1319.7 1332 12.4 11.08 0.32 137
1322 1324 2 16.18 0.17 32
1325 1326.7 1.7 26.89 0.71 46
1327 1328 1 7.73 0.35 8
1331 1332 1 14.51 0.14 15
JORC 2012 Table 1 : Section 1 - Sampling Techniques and Data
Criteria Commentary
Sampling techniques Resource definition drilling at Telfer involves a combination of reverse
circulation (RC) and diamond drilling throughout the mining period. For
diamond drilling, samples are taken according to lithological boundaries, with
geologists defining sample intervals and selecting the assay methodology.
Historically, high-grade reef samples were sent for screen fire assay, while
other samples underwent fire assay for gold and additional elements.
Core sizes for resource drilling usually range from NQ to PQ, while smaller
sizes (NQ or LTK60) are used for grade control. Diamond drilling typically
samples lithological units with lengths between 0.2 to 1.2 meters, with
1-meter intervals being most common and they are barcoded and submitted for
laboratory analysis.
Historically, RC drilling typically produces 1-meter samples, from which a 2-5
kg sub-sample is taken using a riffle splitter, then pulverised for gold
assay. Earlier RC drilling involved samples from 0.5-meter to 2-meter
intervals, with the small intervals were used to target reefs. Recent RC
drilling for resource definition uses 1-meter intervals and split using cone
splitter from which a 2-5 kg sub-sample is taken with bulk reject material
stored temporarily. While grade control uses 2-meter intervals and split using
cone splitter. All RC drilling has field duplicates conducted at a 1:20 ratio.
Rock chip samples, collected manually from exposed development faces, are
typically 2-3 kg, collected perpendicular to bedding, and include all relevant
domains (reef, hanging wall, footwall). These samples are stored in
pre-numbered bags for analysis.
Drilling techniques Drilling at the Telfer has evolved over time, following industry-standard
protocols. Before 1998, drilling targeted mainly previously mined areas, while
from 1998 to 2002, diamond drilling formed the primary data source for current
Mineral Resource estimates, supplemented by RC drilling. Currently, RC
drilling is the primary data source for the open pit resources and diamond
drilling for underground resources.
Currently, NQ2 is the dominant drill size for diamond drilling and RC Drilling
is drilled with a pre-collar of 143mm then reduced to 134mm diameter.
Additional core sizes, including NQ, HQ, HQ3, LTK60, and limited PQ and BQ,
have also been used at Telfer. LTK60 and BQ have mainly been used for grade
control. The Reflex orientation tool is used by drillers, with all core
being oriented using Ezy-Mark to mark the bottom of the hole. The core is then
re-constructed in V-Rail, where the orientation line is drawn along the core
Drill sample recovery Core recovery data from diamond drilling is systematically recorded by
comparing drillers' depth blocks with database records and is stored in the
geological database. If excessive core loss occurs, a wedge hole is often
drilled to recover the lost interval. A review in 2019 confirmed no
significant relationship between sample recovery and grade for either core or
RC samples, with high core recovery minimising potential loss effects.
Following the review, weighing each RC sample at the rig was implemented to
ensure consistent sample support in resource estimation.
Logging Geological logging is conducted for all diamond and reverse circulation (RC)
drill holes, capturing lithology, alteration, mineralisation, veining, and
structure (for diamond core). Diamond drill holes are also quantitatively
logged for veining, vein percentage, and structure. All drill core is
photographed before sampling, using either slide film or digital cameras.
Logged data is validated before merging into the database, which contains over
1,000 km of logged geology, covering approximately 80% of total drilling. Rock
Quality Designation (RQD) is routinely recorded, with around 900 diamond holes
geotechnically assessed. The level of logging detail is appropriate for
resource estimation and related studies.
Sub-sampling techniques and sample preparation Sampling and quality control procedures are designed for the material being
tested. Geologists define sample intervals to avoid crossing key lithological
contacts and select appropriate assay methods. Diamond core is typically
sampled as half-core, while RC samples are collected dry, with conditions
recorded. Since 2015, cone splitters have replaced riffle splitters for RC
sampling, with field duplicates taken at a 1:20 ratio.
Core samples are processed through drying, crushing, and pulverising, with
historical standards requiring 90% passing 75 µm. Older RC drilling used
0.5-2 m intervals, while recent resource definition drilling follows 1 m
intervals (2 m for grade control), with a 5 kg primary split collected.
Samples are prepared at the Telfer lab, where they are crushed, sub-split, and
pulverised to 95% passing 106 µm. Gold is analysed via 30 g fire assay, while
base metals, sulphur, and arsenic are tested by ICP. Cyanide-soluble copper is
determined by bottle roll leach with AAS analysis. To ensure accuracy, 1 in 20
samples undergo external lab verification.
Quality of assay data and laboratory tests Assay and quality control protocols at the Telfer deposit have evolved to
align with industry standards. Before 1998, quality control procedures
followed industry norms of the time, with no major concerns identified. From
1998 onwards, protocols were enhanced, particularly during prefeasibility and
feasibility studies conducted between 1998 and 2002.
Samples are primarily prepared at the Telfer laboratory and then sent to
external commercial labs for analysis. Currently, all resource definition
samples have been assayed through a combination of the Telfer Laboratory and
the Bureau Veritas (BV) Commercial Lab in Perth and all grade control samples
have been sent through Telfer Laboratory. Gold is analysed using fire assay,
while multi-element analyses-including silver, arsenic, bismuth, copper, iron,
nickel, lead, sulphur, and zinc-are conducted using ICP techniques.
Cyanide-soluble copper is assessed via bottle roll leach with AAS analysis.
Since 1998, comprehensive quality control measures have been in place,
including the use of Certified Reference Materials (CRMs), blanks, duplicate
assays, blind pulp re-submissions and checks at independent laboratories.
Matrix-matched CRMs were introduced in 1999, and transition to multi client
CRMs in 2018. Since 2000, Telfer's laboratory was managed by commercial
organisations until Telfer re-opening in 2002 has been managed by Newcrest and
now, Greatland.
Regular reviews of Quality Assurance and Quality Control (QAQC) procedures,
including sample resubmissions and bias assessments, help ensure data accuracy
and reliability. Monthly reports document any anomalies, with corrective
actions taken as needed. Comparison studies, including analyses of duplicate
pulp samples sent to external laboratories, confirm data precision, with a 90%
repeatability rate. The QAQC protocols and assay techniques used are
considered reliable for Mineral Resource estimation.
During the 2002 feasibility study, 13,570 pulp duplicate samples were
dispatched from the Telfer preparation laboratory for analysis at a check
laboratory. Insignificant bias was identified between the original and check
laboratories for gold (-0.8%) and copper (0.5%).
Verification of sampling and assaying Drill hole data is securely stored in an acQuire database, with stringent
controls to ensure data integrity and prevent errors or duplication. Data
collection, including collar coordinates, drill hole designation, logging, and
assaying, follows strict protocols to maintain accuracy. Validation involves
multiple stages, with input from geologists, surveyors, assay laboratories,
and down-hole surveyors where applicable.
Data entry has evolved from manual methods to direct digital input,
incorporating automated validation checks. Internal and external reviews
further enhance data quality before resource estimation. Resource data is
managed daily by site geologists, with additional verification by a
centralised resource team.
Sampling details are recorded digitally, utilising barcode and tracking
systems to monitor sample integrity throughout the process. Recent drilling
programs employ numbered bags for tracking consistency. Regular audits of both
internal and commercial laboratories ensure compliance with quality standards.
No assay data adjustments have been made in the Mineral Resource estimate.
Location of data points Mining operations at Telfer Gold Mine adhere to periodic reporting
requirements for the WA Department of Mines, Industry Regulation and Safety
(DMIRS), using the MGA94/AHD coordinate system for official submissions.
However, site operations utilise the Telfer Mine Grid (TMG) and Telfer Height
Datum (THD), requiring coordinate transformations between the national and
operational coordinate systems.
This has been supplied by AAM Surveys in 1995 (AMG84 to Telfer Mine Grid) and
AAMHATCH in February 2007 (Telfer Mine Grid to MGA Transformation). Both
reports also addressed the height datum and in 2007 established the THD=AHD +
5193.7m.
A local grid covers the whole of the Telfer mine area (Telfer Mine Grid 2002).
It is oriented with grid north at 44o03'12' west of magnetic north.
Topographic control is maintained through a combination of surface and aerial
surveys, with routine updates for pits and underground voids. Drill hole
collars are surveyed upon completion by mine surveyors. The natural surface
topography, along with current pit surveys and underground voids (development,
stopes and vertical openings) are used to deplete the resources and account
for changes in mining areas at Telfer.
Downhole survey methods have evolved over time, progressing from early
single-shot cameras to modern electronic tools. Currently, drilling programs
include multi-shot surveys at regular intervals, with post-completion surveys
conducted at finer resolutions. Specific drilling campaigns may incorporate
gyroscopic surveys where required. Routine in-pit drilling, particularly for
pre-production and grade control, typically excludes downhole surveys, relying
on collar surveys for accuracy.
Data spacing and distribution The drill hole spacing is sufficient to demonstrate geological continuity
appropriate for the Mineral Resource and the classifications applied under the
2012 JORC Code.
The drill spacing applied to specific domains within the overall resource is
variable and is considered suitable for the style of mineralisation and
mineral resource estimation requirements.
Orientation of data in relation to geological structure The Telfer mine site topography is dominated by two large scale asymmetric
dome structures with steep west dipping axial planes. Main Dome is in the
southeast portion of the mine and is exposed over a strike distance of 3 km
north-south and 2 km east-west before plunging under transported cover. West
Dome forms the topographical high in the northwest quadrant of the mine and
has similar dimensions to Main Dome. Both fold structures have shallow to
moderately dipping western limbs and moderate to steep dipping eastern limbs.
Surface drilling is orientated to ensure optimal intersection angle for the
reefs. Underground drilling orientation may be limited by available collar
locations, but acceptable intersection angles are considered during the drill
hole planning process. No orientation bias has been indicated in the
drilling data.
Sample security Sample security is maintained through a tracking system from drilling to
database entry. While barcoding was previously used, it has been replaced with
pre-numbered calico bags for resource development and underground drilling
samples.
All sample movements, including dispatch details, drill hole identification,
sample ranges, and analytical requests, are recorded in a database. Any
discrepancies identified upon receipt by the laboratory are validated to
ensure data integrity.
Audits or reviews In-house reviews of data, QAQC results, sampling protocols and compliance with
corporate and site protocols are carried out at various frequencies by company
employees not closely associated with the Telfer projects. Procedure audits
and reviews are carried out by corporate employees during site visits.
JORC 2012 Table 1: Section 2- Reporting of Exploration Results
Criteria Commentary
Mineral tenement and land tenure status Mining and ore processing at Telfer operate under granted leases and licenses
covering all key infrastructure, including open pits, underground resources,
processing facilities, waste storage, and support services. The Telfer Main
Dome Underground Mineral Resource is within mining leases M45/6 and M45/8,
while the West Dome Mineral Resource, approximately 3km northwest of the Main
Dome open pit, lies within leases M45/7 and M45/33. These leases are currently
under renewal.
An Indigenous Land Use Agreement (ILUA) has been in place since December 2015,
covering all operational aspects of the site. Telfer operations also remain
compliant with the Mining Rehabilitation Fund (MRF) levy.
Exploration done by other parties The Telfer district was first geologically mapped by the Bureau of Mineral
Resources in 1959, though no gold or copper mineralization was identified. In
1971, regional sampling by Day Dawn Minerals NL detected anomalous copper and
gold at Main Dome. From 1972 to 1975, Newmont Pty Ltd conducted extensive
exploration and drilling, defining an open pit reserve primarily in the Middle
Vale Reef.
In 1975, BHP Gold acquired a 30% stake in the project, and in 1990, Newmont
and BHP Gold merged their Australian assets to form Newcrest Mining Limited.
Newcrest managed exploration and resource drilling from 1990 until its
acquisition by Newmont Corp on November 6, 2023. Newmont later divested
Telfer, selling it to Greatland Gold on December 4, 2024, which now oversees
exploration and drilling activities.
Geology Telfer is located within the northwestern Paterson Orogen and is hosted by the
Yeneena Supergroup, a 9 km thick sequence of marine sedimentary rocks. Gold
and copper mineralization occurs in stratiform reefs and stockworks within the
Malu Formation of the Lamil Group, controlled by both structure and lithology.
Mineralisation styles include high-grade narrow reefs, reef stockwork
corridors, sheeted vein sets, and extensive low-grade stockwork, which forms
most of the sulphide resource. Sulphide mineralisation consists mainly of
pyrite and chalcopyrite, with copper minerals including chalcopyrite,
chalcocite, and bornite. Gold is primarily free-grained or associated with
sulphides and quartz/dolomite gangue, with a correlation between vein density
and gold grade.
The highest gold and copper grades occur within bedding sub-parallel reef
systems, including multiple reef structures in Main Dome, such as E-Reefs,
MVR, M10-M70 reefs, A-Reef, and B-Reefs (notably B30). Additional
mineralisation occurs in northwest-trending and north-dipping veins. Stockwork
mineralisation, found in open pits, Telfer Deeps, and the Vertical Stockwork
Corridor (VSC), is best developed in the axial zones of Main Dome and West
Dome, often extending over large areas (0.1 km to 1.5 km). It can include
brecciated zones filled with quartz, carbonate, and sulphides
Drill hole Information Refer to Tables 1 and 2 - Significant Intercepts.
Data aggregation methods Significant assay intercepts are reported using length-weighted averages based
on predefined thresholds, with a maximum allowable internal dilution.
For Open pit (RC) significant intercepts a maximum of 5m of internal dilution,
minimum width of 3m, minimum grade of 0.5g/t and a gram metre (grade x length)
of greater than 10gm.
For Underground diamond significant intercepts a maximum of 5m of internal
dilution, minimum width of 1m, minimum grade of 0.5g/t and a gram metre (grade
x length) of greater than 10gm.
Relationship between mineralisation widths and intercept lengths Significant assay intervals represent apparent widths, as drilling is not
always perpendicular to the dip of mineralisation. True widths are typically
less than downhole widths and can only be estimated once all results are
received and final geological interpretations are completed. Where access
permits all holes are drilled to intercept as close to true width as possible.
Diagrams As provided
Balanced reporting This is the second report released on the West Dome Underground by the
Greatland group since taking ownership of the Telfer mine. Drilling results
will be reported regularly and released to the market.
Earlier reporting of exploration programs conducted by Newcrest and Greatland
have previously been reported. Drilling programmes are ongoing and further
material results will be reported in subsequent releases.
Other substantive exploration data NIL
Further work Drilling is ongoing with further work is planned to evaluate exploration
opportunities that extend the known mineralisation.
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