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GREAT BOULDER RESOURCES LIMITED — Capital/Financing Update 2025
Dec 7, 2025
64967_rns_2025-12-07_1264a524-6223-4861-9fb5-eb96f4895d27.pdf
Capital/Financing Update
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ASX Announcement
8 DECEMBER 2025
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SIDE WELL EXPLORATION UPDATE
HIGHLIGHTS
Assays have been received from recent RC drilling programs at Eaglehawk, Mulga Bill East and Golden Bracelet within the Side Well Gold Project
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➢ Further high-grade intersections at Eaglehawk include:
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1m @ 481.00g/t Au from 129m in 25EHRC041
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3m @ 7.97g/t Au from 62m, including 1m @ 21.30g/t Au from 62m in 25EHRC042
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➢ These results are from the same RC program that intersected 105m @ 2.41g/t Au from 95m in 25EHRC040 announced 10 November 2025
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➢ Highlights from other RC drilling programs include:
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5m @ 5.82g/t Au from 134m in 25MBRC039 at Mulga Bill East
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24m @ 1.37g/t Au from 76m, including 8m @ 3.57g/t Au from 76m in 25MBRC048 at Mulga Bill East
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12m @ 1.14g/t Au from 24m, including 8m @ 1.64g/t Au from 28m in 25SWRC063 at Golden Bracelet
Great Boulder Resources (“ Great Boulder ” or the “ Company ”) (ASX: GBR ) is pleased to provide an update on recent drilling at the Company’s flagship Side Well Gold Project[1] (“ Side Well ”) near Meekatharra in Western Australia which hosts a MRE of 668,000oz @ 2.8 g/t Au.
Great Boulder’s Managing Director, Andrew Paterson commented:
“Eaglehawk continues to deliver new high-grade intersections outside the area of the pending resource. The 481.00g/t result appears to sit within a new west-dipping quartz lode, and further drilling is expected to confirm our interpretation.”
“The final round of resource definition drilling at Golden Bracelet added confidence to the two interpreted main zones, with broad intersections of gold mineralisation defined. Resource estimation for that deposit is now underway.”
“At present we have three rigs busy at Side Well testing targets for our next phase of growth: the RC rig is currently at Flagpole completing resource definition holes, while the Diamond rig is drilling deep holes at Mulga Bill testing longer-term growth opportunities. Meanwhile regional AC drilling continues over multiple target areas.”
1 Please refer to the Tenements table in GBR’s recent quarterly report for relevant joint venture interests
ASX Code: GBR Contact: Andrew Paterson, Managing Director E: [email protected] GREATBOULDER.COM.AU P: +61 8 9321 6037 Level 1, 51 Colin St West Perth WA 6005 ABN 70 611 695 955
ASX Announcement 8 DECEMBER 2025
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“Resource estimation is progressing well for the five deposits which will comprise our imminent MRE update. We anticipate a busy end to 2025, which will set the Company in good stead for a solid start in January.”
Side Well Gold Project
Great Boulder’s flagship Side Well Gold Project is located in the heart of the Meekatharra gold field neighbouring Westgold Resources’ (ASX:WGX) Paddy’s Flat operation. The project currently hosts a Mineral Resource Estimate (MRE) of 7.45Mt @ 2.9g/t Au for 668,000oz, as announced in late 2023 (Table 1). The Company is pleased to be on track to deliver an updated MRE by the end of 2025. Side Well is surrounded by mining infrastructure in the rapidly growing Murchison region.
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FIGURE 1: THE SIDE WELL PROJECT IS STRATEGICALLY LOCATED IN THE NORTHERN MURCHISON
Eaglehawk Deposit
Six RC holes were drilled at Eaglehawk for 1,140m, with assay results from three holes announced on 10 November 2025 including the intersection of 105m @ 2.41g/t Au from 95m in 25EHRC040, in a newly discovered cross-cutting structure striking approximately northwest to southeast and dipping towards the northeast. Further RC drilling has since been completed to confirm the strike and dip of this zone, with assays pending.
Significant intersections from the other holes in this program include:
E: [email protected] GREATBOULDER.COM.AU ABN 70 611 695 955
ASX Code: GBR Contact: Andrew Paterson, Managing Director P: +61 8 9321 6037 Level 1, 51 Colin St West Perth WA 6005
ASX Announcement 8 DECEMBER 2025
3
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1m @ 481.00g/t Au from 129m in 25EHRC041
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3m @ 7.97g/t Au from 62m, including 1m @ 21.30g/t Au from 62m in 25EHRC042.
Hole 25EHRC039 was abandoned at 90m prior to reaching the target depth due to ground conditions.
A further 13 RC holes for 2,601m have since been completed at Eaglehawk testing the newly identified cross-structure as well as other extensional targets at depth and along strike. Assays for these holes are expected to be received during December.
A cross-section showing the interpreted high-grade vein intersected by 25EHRC040 will be published after additional drilling is completed.
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FIGURE 2: NEW RC RESULTS AT EAGLEHAWK
E: [email protected] GREATBOULDER.COM.AU ABN 70 611 695 955
ASX Code: GBR Contact: Andrew Paterson, Managing Director P: +61 8 9321 6037 Level 1, 51 Colin St West Perth WA 6005
ASX Announcement
4
8 DECEMBER 2025
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Mulga Bill East
23 RC holes for 3,747m were drilled at Mulga Bill East, targeting a north-northeast-trending zone of gold mineralisation first identified in GBR’s early drilling programs in 2021-22. The majority of significant intercepts appear to be related to high grade west dipping vein sets that are hosted in a newly identified “eastern” dacitic stratigraphic unit. The identification of this unit, that has similarities to the host at the central Mulga Bill deposit, highlights the growth potential both along strike and down-dip.
This trend is less defined by drilling, however its proximity to the main Mulga Bill deposit suggests potential for Mulga Bill East mineralisation to be exploited by a future open pit mining operation. Highlights from this program include:
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4m @ 3.36g/t Au from 76m, 3m @ 9.49g/t Au from 134m and 5m @ 2.69g/t Au from 163m in 25MBRC039 north of the current resource
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24m @ 1.37g/t Au from 76m, including 8m @ 3.57g/t Au from 76m in 25MBRC048
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9m @ 2.09g/t Au from 105m, including 2m @ 5.00g/t Au from 105m in 25MBRC040 north of the current resource
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8m @ 1.98g/t Au from 148m in 25MBRC042 east of the current resource
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5m @ 1.88g/t Au from 99m in 25MBRC033 north of the current resource.
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FIGURE 3: MULGA BILL EAST SECTION SHOWING RECENT RESULTS IN WEST-DIPPING VEINS
E: [email protected] GREATBOULDER.COM.AU ABN 70 611 695 955
ASX Code: GBR Contact: Andrew Paterson, Managing Director P: +61 8 9321 6037 Level 1, 51 Colin St West Perth WA 6005
ASX Announcement
5
8 DECEMBER 2025
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FIGURE 4: PLAN VIEW OF RECENT RC RESULTS FROM MULGA BILL EAST
Side Well South / Golden Bracelet
Assays have been received for the final 22 RC holes for 3,447m drilled at Side Well South during recent resource definition work.
The Side Well South name was originally used as a general geographic reference, however the deposit will now be known as Golden Bracelet, taking its name from a nearby historic mine working.
Highlights from the recent drilling include:
- 12m @ 1.14g/t Au from 24m, including 8m @ 1.64g/t Au from 28m in 25SWRC063
E: [email protected] GREATBOULDER.COM.AU ABN 70 611 695 955
ASX Code: GBR Contact: Andrew Paterson, Managing Director P: +61 8 9321 6037 Level 1, 51 Colin St West Perth WA 6005
ASX Announcement 8 DECEMBER 2025
6
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7m @ 1.45g/t Au from 121m in 25SWRC059
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5m @ 1.55g/t Au from 94m in 25SWRC049
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16m @ 0.95g/t Au from 72m in 25SWRC054.
These results confirm and add confidence to the Company’s interpretation of the two main mineralised trends at Golden Bracelet. Lithology, regolith and mineralisation wireframes have been updated with the new data and estimation is underway for the initial Golden Bracelet mineral resource estimate (MRE).
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FIGURE 5: RECENT DRILLING RESULTS FROM GOLDEN BRACELET
E: [email protected] GREATBOULDER.COM.AU ABN 70 611 695 955
ASX Code: GBR Contact: Andrew Paterson, Managing Director P: +61 8 9321 6037 Level 1, 51 Colin St West Perth WA 6005
ASX Announcement
7
8 DECEMBER 2025
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FIGURE 6: GOLDEN BRACELET SECTION 704935N SHOWING SOME OF THE RECENT INTERSECTIONS
Ironbark Progress
Negotiations for a Mining Agreement with the Yugunga Nya Traditional Owner group are continuing. Once the Ironbark MRE is updated the Company will prepare an updated economic assessment of likely mining scenarios which will form the basis of the proposed royalty structure under the agreement. Compensation clauses including royalties are the final section of the agreement to be decided. The Mining Agreement is a prerequisite for grant of the Ironbark mining lease, which is itself a prerequisite for a mining approval application.
Field programs relating to the Ironbark mining approval application have been completed. Final consultants’ reports are expected to be received shortly.
Next Steps
External consultants are working on resource estimates for Mulga Bill, Ironbark, Eaglehawk, Saltbush and Golden Bracelet, with an updated project-wide MRE anticipated later this month.
Diamond drilling is continuing on the EIS co-funded program of deeper holes testing high-grade targets beneath Mulga Bill and Ironbark. This program is intended to demonstrate the large-scale potential of this multi-kilometre intrusive-related gold system, with drilling expected to continue into
ASX Code: GBR Contact: Andrew Paterson, Managing Director E: [email protected] GREATBOULDER.COM.AU P: +61 8 9321 6037 Level 1, 51 Colin St West Perth WA 6005 ABN 70 611 695 955
ASX Announcement 8 DECEMBER 2025
8
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early 2026. Great Boulder has secured up to $180,000 in co-funded drilling from the WA Government’s Exploration Incentive Scheme (EIS) for this drilling.
RC drilling will continue working on priority targets at Flagpole and Eaglehawk to continue extending and infilling zones of high-grade gold. Recent results and any subsequent drilling success at Eaglehawk will demonstrate immediate upside to the pending maiden Eaglehawk MRE, which is based upon drilling completed up to the end of October.
AC drilling continues testing a range of targets, with recent drilling around the Flagpole prospect south of Mulga Bill, follow-up holes based on results of recent testing between Mulga Bill and Ironbark and drilling within the Ironbark corridor to complete testing of stratigraphic and IP-generated targets.
This announcement has been approved by the Great Boulder Board.
For further information contact:
Andrew Paterson Managing Director Great Boulder Resources Limited [email protected] www.greatboulder.com.au
Media Lucas Robinson Corporate Storytime +61 408 228 889 [email protected]
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Follow GBR on LinkedIn
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COMPETENT PERSON’S STATEMENT
The information in this Announcement that relates to Exploration Targets and Exploration Results is based upon work undertaken by Mr Andrew Paterson who is a Member of the Australasian Institute of Geoscientists (AIG). Mr Paterson has sufficient experience that is relevant to the style of mineralisation and type of deposit under consideration and to the activity which he is undertaking to qualify as a ‘Competent Person’ as defined in the 2012 Edition of the ‘Australasian Code for Reporting of Exploration Results, Mineral Resources and Ore Reserves’ (JORC Code). Mr Paterson is an employee of Great Boulder Resources and consents to the inclusion in the report of the matters based on their information in the form and context in which it appears.
The information that relates to Mineral Resources was previously reported by the Company in its announcement to the ASX on 16 November 2023 ‘Side Well Mineral Resource Increases to 688Koz Au’, a copy of which is available on the Company’s website at https://www.greatboulder.com.au/investors/asx-announcements/. The Company is not aware of any new information or data that materially affects the information included in this announcement and that all material assumptions and technical parameters underpinning the estimates continue to apply and have not material changed. 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.
E: [email protected] GREATBOULDER.COM.AU ABN 70 611 695 955
ASX Code: GBR Contact: Andrew Paterson, Managing Director P: +61 8 9321 6037 Level 1, 51 Colin St West Perth WA 6005
ASX Announcement
9
8 DECEMBER 2025
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FIGURE 7: SIDE WELL GOLD PROJECT DEPOSITS AND OTHER PROSPECTS
TABLE 1: SIDE WELL MINERAL RESOURCE SUMMARY, NOVEMBER 2023
| Indicated | Indicated | Indicated | Inferred | Inferred | Inferred | Total | |||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| Deposit | Type | Cut-off | Tonnes (kt) |
Au (g/t) |
Ounces | Tonnes (kt) |
Au (g/t) |
Ounces | Tonnes (kt) |
Au (g/t) |
Ounces |
| Mulga Bill | Open Pit U/ground |
0.5 1.0 |
1,667 733 |
3.1 3.5 |
169,000 83,000 |
2,982 1,130 |
1.9 3.6 |
183,000 132,000 |
4,649 1,863 |
2.4 3.6 |
352,000 216,000 |
| Subtotal | 2,399 | 3.3 | 252,000 | 4,112 | 2.4 | 316,000 | 6,511 | 2.7 | 568,000 | ||
| Ironbark | Open Pit U/ground |
0.5 1.0 |
753 0 |
3.7 0.0 |
88,000 0 |
186 0 |
1.9 0.0 |
11,000 0 |
938 0 |
3.3 0.0 |
100,000 0 |
| Subtotal | 753 | 3.7 | 88,000 | 186 | 1.9 | 11,000 | 938 | 3.3 | 100,000 | ||
| Total | 3,152 | 3.4 | 340,000 | 4,298 | 2.4 | 327,000 | 7,450 | 2.8 | 668,000 |
Subtotals are rounded for reporting purposes. Rounding errors may occur.
ASX Code: GBR Contact: Andrew Paterson, Managing Director E: [email protected] P: +61 8 9321 6037 Level 1, 51 Colin St West Perth WA 6005 ABN 70 611 695 955
GREATBOULDER.COM.AU
ASX Announcement
10
8 DECEMBER 2025
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ABOUT GREAT BOULDER RESOURCES
Great Boulder is a mineral exploration company with a portfolio of highly prospective gold and base metals assets in Western Australia ranging from greenfields through to advanced exploration. The Company’s core focus is the Side Well Gold Project at Meekatharra in the Murchison gold field, where exploration has defined a Mineral Resource of 7.45Mt @ 2.8g/t Au for 668,000oz Au (340koz @ 3.4g/t Au Indicated, 327koz @ 2.4g/t Au Inferred). The Company is also progressing earlystage exploration at its Wellington Base Metal Project located in an emerging MVT province. With a portfolio of highly prospective assets plus the backing of a strong technical team, the Company is well positioned for future success.
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CAPITAL STRUCTURE
1,041M ~$16.3M $1.33M $263k SHARES ON ISSUE CASH LISTED INVESTMENT DAILY LIQUIDITY ASX:GBR As at 30 Sep 25 Cosmo Metals (ASX:CMO) Average 30-day value traded $80M Nil 102M ~39% MARKET CAP DEBT UNLISTED OPTIONS TOP 20 OWNERSHIP At $0.08/sh As at 30 Sep 25
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Exploring WA Gold & Developing a Technically focused Undertaking smart, Base Metal assets, significant high-grade, exploration team with innovative & located in proximity to large scale gold a strong track record systematic exploration operating mines & system at Side Well of discovery infrastructure
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Ongoing drilling at multiple projects providing consistent, material newsflow
E: [email protected] GREATBOULDER.COM.AU ABN 70 611 695 955
ASX Code: GBR Contact: Andrew Paterson, Managing Director P: +61 8 9321 6037 Level 1, 51 Colin St West Perth WA 6005
ASX Announcement
11
8 DECEMBER 2025
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TABLE 2: SIGNIFICANT INTERSECTIONS – EAGLEHAWK RC
| Prospect | Hole ID | From | To | Width | Grade | Comments |
|---|---|---|---|---|---|---|
| Eaglehawk | 25EHRC037 | 88 | 92 | 4 | 0.24 | 4m composite |
| (Previously announced) | 102 | 103 | 1 | 1.21 | ||
| 25EHRC038 | 116 | 120 | 4 | 0.93 | 4m composite | |
| (Previously announced) | 144 | 148 | 4 | 0.14 | 4m composite | |
| 174 | 175 | 1 | 0.58 | |||
| 25EHRC039 | 0 | 90 | 90 | Hole abandoned at 90m | ||
| 25EHRC040 | 24 | 28 | 4 | 0.25 | 4m composite | |
| (Previously announced) | 95 | 200 | 105 | 2.41 | 4m comps from 188m | |
| Including | 102 | 105 | 3 | 18.85 | ||
| And | 114 | 127 | 13 | 5.17 | ||
| And | 180 | 186 | 6 | 5.08 | ||
| 204 | 212 | 8 | 0.29 | |||
| 25EHRC041 | 129 | 130 | 1 | 481.00 | ||
| 25EHRC042 | 51 | 52 | 1 | 0.54 | ||
| 62 | 65 | 3 | 7.97 | |||
| Including | 62 | 63 | 1 | 21.30 | ||
| 68 | 72 | 4 | 0.63 | 4m composite | ||
| 124 | 128 | 4 | 0.10 | 4m composite | ||
| 156 | 164 | 8 | 2.01 | 4m composites | ||
| 172 | 180 | 8 | 0.63 | 4m composites |
TABLE 3: SIGNIFICANT INTERSECTIONS – GOLDEN BRACELET RC
| Prospect | Hole ID | From | To | Width | Grade | Comments |
|---|---|---|---|---|---|---|
| Golden Bracelet | 25SWRC045 | 17 | 18 | 1 | 0.79 | |
| 20 | 21 | 1 | 0.58 | |||
| 27 | 54 | 27 | 0.62 | 4m comps 28 - 44m | ||
| 27 | 28 | 1 | 1.71 | |||
| 28 | 44 | 16 | 0.42 | 4m composites | ||
| 44 | 54 | 10 | 0.83 | |||
| 65 | 77 | 12 | 0.79 | |||
| 154 | 155 | 1 | 0.61 | |||
| 164 | 165 | 1 | 1.29 | |||
| 25SWRC046 | 12 | 16 | 4 | 0.13 | 4m composite | |
| 19 | 20 | 1 | 0.81 | |||
| 37 | 40 | 3 | 1.16 | |||
| 100 | 108 | 8 | 0.13 | 4m composites | ||
| 124 | 128 | 4 | 0.28 | 4m composite | ||
| 25SWRC047 | 92 | 93 | 1 | 0.62 | ||
| 158 | 162 | 4 | 1.20 | |||
| 168 | 172 | 4 | 0.93 | |||
| 177 | 178 | 1 | 0.52 |
ASX Code: GBR Contact: Andrew Paterson, Managing Director E: [email protected] GREATBOULDER.COM.AU P: +61 8 9321 6037 Level 1, 51 Colin St West Perth WA 6005 ABN 70 611 695 955
ASX Announcement
12
8 DECEMBER 2025
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| Prospect | Hole ID | From | To | Width | Grade | Comments |
|---|---|---|---|---|---|---|
| 25SWRC048 | 16 | 18 | 2 | 1.23 | ||
| 22 | 24 | 2 | 0.89 | |||
| 28 | 29 | 1 | 1.16 | |||
| 36 | 39 | 3 | 1.57 | |||
| 43 | 44 | 1 | 1.76 | |||
| 25SWRC049 | 72 | 80 | 8 | 0.19 | ||
| 85 | 87 | 2 | 0.95 | |||
| 89 | 90 | 1 | 0.57 | |||
| 94 | 99 | 5 | 1.55 | |||
| 25SWRC050 | 59 | 60 | 1 | 0.66 | ||
| 81 | 82 | 1 | 0.90 | |||
| 101 | 102 | 1 | 1.39 | |||
| 117 | 120 | 3 | 0.81 | |||
| 25SWRC051 | 27 | 29 | 2 | 0.73 | ||
| 31 | 32 | 1 | 0.53 | |||
| 33 | 34 | 1 | 0.50 | |||
| 109 | 115 | 6 | 0.52 | |||
| 118 | 119 | 1 | 0.92 | |||
| 126 | 127 | 1 | 0.89 | |||
| 131 | 134 | 3 | 0.65 | |||
| 25SWRC052 | 67 | 68 | 1 | 0.51 | ||
| 75 | 76 | 1 | 0.54 | |||
| 86 | 87 | 1 | 0.56 | |||
| 109 | 115 | 6 | 0.80 | |||
| 197 | 199 | 2 | 0.86 | |||
| 203 | 207 | 4 | 1.20 | |||
| 25SWRC053 | 16 | 24 | 8 | 0.14 | 4m composites | |
| 169 | 170 | 1 | 0.76 | |||
| 174 | 175 | 1 | 0.80 | |||
| 177 | 178 | 1 | 1.45 | |||
| 198 | 199 | 1 | 0.56 | |||
| 25SWRC054 | 61 | 62 | 1 | 1.39 | ||
| 72 | 88 | 16 | 0.95 | |||
| 25SWRC055 | 206 | 207 | 1 | 0.52 | ||
| 25SWRC056 | 91 | 92 | 1 | 0.97 | ||
| 135 | 139 | 4 | 0.64 | |||
| 144 | 145 | 1 | 0.96 | |||
| 164 | 165 | 1 | 0.90 | |||
| 167 | 169 | 2 | 1.07 | |||
| 173 | 178 | 5 | 1.40 | |||
| 25SWRC057 | 98 | 101 | 3 | 0.65 | ||
| 104 | 105 | 1 | 0.61 | |||
| 108 | 112 | 4 | 0.46 | 4m composite |
ASX Code: GBR Contact: Andrew Paterson, Managing Director E: [email protected] P: +61 8 9321 6037 Level 1, 51 Colin St West Perth WA 6005 ABN 70 611 695 955
GREATBOULDER.COM.AU
ASX Announcement
13
8 DECEMBER 2025
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| Prospect | Hole ID | From | To | Width | Grade | Comments |
|---|---|---|---|---|---|---|
| 116 | 124 | 8 | 0.25 | 4m composites | ||
| 25SWRC058 | 146 | 148 | 2 | 0.69 | ||
| 25SWRC059 | 121 | 128 | 7 | 1.45 | ||
| 130 | 131 | 1 | 1.27 | |||
| 133 | 134 | 1 | 1.76 | |||
| 154 | 159 | 5 | 1.01 | |||
| 25SWRC060 | 34 | 35 | 1 | 0.51 | ||
| 44 | 48 | 4 | 1.07 | |||
| 52 | 54 | 2 | 1.15 | |||
| 25SWRC061 | 16 | 18 | 2 | 1.22 | ||
| 20 | 22 | 2 | 1.06 | |||
| 24 | 26 | 2 | 1.67 | |||
| 28 | 32 | 4 | 0.58 | |||
| 34 | 36 | 2 | 0.95 | |||
| 25SWRC062 | 100 | 104 | 4 | 0.15 | 4m composite | |
| 107 | 110 | 3 | 1.37 | |||
| 116 | 119 | 3 | 1.03 | |||
| 25SWRC063 | 24 | 36 | 12 | 1.14 | 4m composites | |
| Including | 28 | 36 | 8 | 1.64 | 4m composites | |
| 58 | 60 | 2 | 0.60 | |||
| 77 | 78 | 1 | 0.92 | |||
| 81 | 89 | 8 | 1.36 | |||
| 100 | 104 | 4 | 1.06 | 4m composite | ||
| 25SWRC064 | 20 | 24 | 4 | 0.16 | 4m composite | |
| 31 | 33 | 2 | 0.97 | |||
| 38 | 39 | 1 | 0.67 | |||
| 48 | 52 | 4 | 0.26 | 4m composite | ||
| 56 | 60 | 4 | 0.17 | 4m composite | ||
| 63 | 65 | 2 | 1.12 | |||
| 76 | 88 | 12 | 0.21 | 4m composites | ||
| 89 | 94 | 5 | 0.77 | |||
| 25SWRC065 | 97 | 102 | 5 | 0.72 | ||
| 111 | 114 | 3 | 0.61 | |||
| 125 | 126 | 1 | 0.59 | |||
| 129 | 130 | 1 | 0.96 | |||
| 154 | 155 | 1 | 1.29 | |||
| 25SWRC066 | 120 | 128 | 8 | 0.23 | 4m composites |
Significant intersections are reported at a 0.1g/t Au cut-off for 4m composite samples and a 0.5g/t Au cut-off for 1m samples.
E: [email protected] ABN 70 611 695 955
ASX Code: GBR Contact: Andrew Paterson, Managing Director P: +61 8 9321 6037 Level 1, 51 Colin St West Perth WA 6005
GREATBOULDER.COM.AU
ASX Announcement
14
8 DECEMBER 2025
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TABLE 4: SIGNIFICANT INTERSECTIONS – MULGA BILL EAST RC
| Prospect | Hole ID | From | To | Width | Grade Comments |
|---|---|---|---|---|---|
| Mulga Bill East | 25MBRC027 |
48 | 56 | 8 | 0.20 4m composites |
| 68 | 76 | 8 | 0.27 4m composites | ||
| 96 | 100 | 4 | 0.11 4m composite | ||
| 25MBRC028 | 113 | 115 | 2 | 1.00 | |
| 126 | 127 | 1 | 0.66 | ||
| 25MBRC029 | 0 | 134 | 134 | No significant intersection | |
| 25MBRC030 | 124 | 125 | 1 | 0.97 | |
| 25MBRC031 | 104 | 116 | 12 | 0.21 4m composites | |
| 120 | 123 | 3 | 0.18 3m comp to EOH | ||
| 25MBRC032 | 0 | 146 | 146 | No significant intersection | |
| 25MBRC033 | 28 | 32 | 4 | 0.11 4m composite | |
| 99 | 104 | 5 | 1.88 | ||
| 25MBRC034 | 24 | 28 | 4 | 0.17 4m composite | |
| 80 | 84 | 4 | 0.39 4m composite | ||
| 112 | 128 | 16 | 0.20 4m composites | ||
| 25MBRC035 | 112 | 120 | 8 | 0.31 4m composites | |
| 161 | 162 | 1 | 0.81 | ||
| 25MBRC036 | 88 | 92 | 4 | 0.65 4m composite | |
| 118 | 119 | 1 | 0.51 | ||
| 143 | 144 | 1 | 3.11 | ||
| 25MBRC037 | 40 | 44 | 4 | 0.14 4m composite | |
| 108 | 120 | 12 | 0.45 4m composites | ||
| 25MBRC038 | 68 | 72 | 4 | 0.27 4m composite | |
| 84 | 88 | 4 | 0.16 4m composite | ||
| 136 | 137 | 1 | 0.54 | ||
| 140 | 141 | 1 | 0.87 | ||
| 143 | 146 | 3 | 0.96 | ||
| 25MBRC039 | 76 | 80 | 4 | 3.36 4m composite | |
| 96 | 100 | 4 | 0.32 4m composite | ||
| 134 | 139 | 5 | 5.82 | ||
| 144 | 148 | 4 | 0.24 4m composite | ||
| 160 | 168 | 8 | 1.92 | ||
| 176 | 180 | 4 | 0.12 4m composite | ||
| 184 | 187 | 3 | 1.23 | ||
| 25MBRC040 | 80 | 84 | 4 | 0.13 4m composite | |
| 102 | 103 | 1 | 0.96 | ||
| 105 | 114 | 9 | 2.09 | ||
| Including | 105 |
107 | 2 | 5.00 | |
| 25MBRC041 | 76 | 84 | 8 | 0.23 4m composites | |
| 108 | 116 | 8 | 0.35 4m composites | ||
| 172 | 176 | 4 | 0.12 4m composite | ||
| 25MBRC042 | 32 | 36 | 4 | 0.27 4m composite |
ASX Code: GBR Contact: Andrew Paterson, Managing Director E: [email protected] GREATBOULDER.COM.AU P: +61 8 9321 6037 Level 1, 51 Colin St West Perth WA 6005 ABN 70 611 695 955
ASX Announcement
15
8 DECEMBER 2025
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==> picture [48 x 57] intentionally omitted <==
| Prospect | Hole ID | From | To | Width | Grade Comments |
|---|---|---|---|---|---|
| 80 | 84 | 4 | 0.10 4m composite | ||
| 88 | 92 | 4 | 0.34 4m composite | ||
| 96 | 100 | 4 | 0.89 4m composite | ||
| 148 | 156 | 8 | 1.98 | ||
| 160 | 164 | 4 | 0.14 4m composite | ||
| 25MBRC043 | 80 | 84 | 4 | 0.22 4m composite | |
| 104 | 112 | 8 | 0.24 4m composites | ||
| 139 | 140 | 1 | 0.77 | ||
| 25MBRC044 | 78 | 80 | 2 | 0.60 | |
| 81 | 82 | 1 | 1.45 | ||
| 109 | 110 | 1 | 0.60 | ||
| 160 | 161 | 1 | 0.69 | ||
| 25MBRC045 | 76 | 84 | 8 | 0.75 4m composites | |
| 157 | 158 | 1 | 3.02 | ||
| 25MBRC046 | 72 | 76 | 4 | 1.24 4m composite | |
| 113 | 114 | 1 | 0.50 | ||
| 164 | 166 | 2 | 1.18 | ||
| 236 | 240 | 4 | 0.25 EOH 4m composite | ||
| 25MBRC047 | 84 | 96 | 12 | 0.18 4m composites | |
| 116 | 117 | 1 | 0.51 | ||
| 25MBRC048 | 76 | 100 | 24 | 1.374m composites | |
| Including | 76 |
84 | 8 | 3.574m composites | |
| 135 | 136 | 1 | 1.75 | ||
| 25MBRC049 | 64 | 68 | 4 | 0.57 4m composite | |
| 76 | 80 | 4 | 1.29 4m composite | ||
| 161 | 162 | 1 | 2.22 | ||
| 184 | 185 | 1 | 0.58 |
TABLE 5: COLLAR DETAILS – RECENT RC DRILLING (GDA94, ZONE 50)
| Hole ID | Prospect | Easting | Northing | RL | Dip | Azi | Total |
|---|---|---|---|---|---|---|---|
| (Mag) | Depth | ||||||
| 25SWRC045 | Golden Bracelet | 660455 | 7049424 | 516 | -60 | 90 | 172 |
| 25SWRC046 | Golden Bracelet | 660433 | 7049449 | 517 | -60 | 90 | 166 |
| 25SWRC047 | Golden Bracelet | 660391 | 7049450 | 516 | -60 | 90 | 190 |
| 25SWRC048 | Golden Bracelet | 660497 | 7049499 | 517 | -60 | 90 | 64 |
| 25SWRC049 | Golden Bracelet | 660460 | 7049499 | 517 | -60 | 90 | 130 |
| 25SWRC050 | Golden Bracelet | 660580 | 7049549 | 518 | -60 | 90 | 130 |
| 25SWRC051 | Golden Bracelet | 660463 | 7049550 | 518 | -60 | 90 | 202 |
| 25SWRC052 | Golden Bracelet | 660683 | 7049301 | 516 | -50 | 270 | 214 |
| 25SWRC053 | Golden Bracelet | 660536 | 7049450 | 516 | -60 | 90 | 226 |
| 25SWRC054 | Golden Bracelet | 660635 | 7049249 | 515 | -50 | 270 | 112 |
| 25SWRC055 | Golden Bracelet | 660332 | 7049300 | 515 | -56 | 90 | 226 |
ASX Code: GBR Contact: Andrew Paterson, Managing Director E: [email protected] GREATBOULDER.COM.AU P: +61 8 9321 6037 Level 1, 51 Colin St West Perth WA 6005 ABN 70 611 695 955
ASX Announcement
16
8 DECEMBER 2025
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==> picture [48 x 57] intentionally omitted <==
| Hole ID | Prospect | Easting | Northing | RL | Dip | Azi | Total |
|---|---|---|---|---|---|---|---|
| (Mag) | Depth | ||||||
| 25SWRC056 | Golden Bracelet | 660387 | 7049400 | 516 | -60 | 90 | 190 |
| 25SWRC057 | Golden Bracelet | 660649 | 7049201 | 516 | -50 | 270 | 160 |
| 25SWRC058 | Golden Bracelet | 660366 | 7049251 | 514 | -60 | 90 | 178 |
| 25SWRC059 | Golden Bracelet | 660377 | 7049349 | 515 | -60 | 90 | 178 |
| 25SWRC060 | Golden Bracelet | 660580 | 7049365 | 515 | -46 | 110 | 88 |
| 25SWRC061 | Golden Bracelet | 660485 | 7049400 | 516 | -60 | 90 | 58 |
| 25SWRC062 | Golden Bracelet | 660536 | 7049350 | 515 | -60 | 90 | 202 |
| 25SWRC063 | Golden Bracelet | 660417 | 7049350 | 515 | -60 | 90 | 124 |
| 25SWRC064 | Golden Bracelet | 660607 | 7049415 | 516 | -55 | 120 | 106 |
| 25SWRC065 | Golden Bracelet | 660567 | 7049400 | 516 | -60 | 90 | 166 |
| 25SWRC066 | Golden Bracelet | 660567 | 7049500 | 517 | -60 | 90 | 165 |
| 25MBRC027 | Mulga Bill East | 658703 | 7061150 | 511 | -60 | 87 | 104 |
| 25MBRC028 | Mulga Bill East | 658642 | 7061151 | 510 | -60 | 87 | 146 |
| 25MBRC029 | Mulga Bill East | 658583 | 7061150 | 510 | -60 | 87 | 134 |
| 25MBRC030 | Mulga Bill East | 658523 | 7061150 | 510 | -60 | 87 | 128 |
| 25MBRC031 | Mulga Bill East | 658610 | 7060975 | 510 | -60 | 87 | 123 |
| 25MBRC032 | Mulga Bill East | 658556 | 7060975 | 511 | -60 | 87 | 146 |
| 25MBRC033 | Mulga Bill East | 658635 | 7060850 | 511 | -60 | 87 | 134 |
| 25MBRC034 | Mulga Bill East | 658574 | 7060850 | 511 | -60 | 87 | 146 |
| 25MBRC035 | Mulga Bill East | 658513 | 7060849 | 510 | -60 | 87 | 176 |
| 25MBRC036 | Mulga Bill East | 658657 | 7060774 | 511 | -60 | 87 | 158 |
| 25MBRC037 | Mulga Bill East | 658548 | 7060774 | 511 | -60 | 87 | 176 |
| 25MBRC038 | Mulga Bill East | 658645 | 7060675 | 511 | -60 | 87 | 170 |
| 25MBRC039 | Mulga Bill East | 658598 | 7060675 | 511 | -60 | 87 | 194 |
| 25MBRC040 | Mulga Bill East | 658583 | 7060749 | 511 | -60 | 90 | 144 |
| 25MBRC041 | Mulga Bill East | 658533 | 7060748 | 511 | -60 | 90 | 180 |
| 25MBRC042 | Mulga Bill East | 658643 | 7060625 | 511 | -60 | 90 | 168 |
| 25MBRC043 | Mulga Bill East | 658511 | 7060525 | 511 | -60 | 90 | 204 |
| 25MBRC044 | Mulga Bill East | 658591 | 7060524 | 511 | -60 | 90 | 168 |
| 25MBRC045 | Mulga Bill East | 658574 | 7060276 | 512 | -60 | 90 | 198 |
| 25MBRC046 | Mulga Bill East | 658486 | 7060274 | 512 | -60 | 90 | 240 |
| 25MBRC047 | Mulga Bill East | 658614 | 7060251 | 512 | -60 | 90 | 150 |
| 25MBRC048 | Mulga Bill East | 658600 | 7060225 | 512 | -60 | 90 | 162 |
| 25MBRC049 | Mulga Bill East | 658577 | 7060175 | 512 | -60 | 90 | 198 |
| 25EHRC043 | Eaglehawk | 658390 | 7061652 | 510 | -60 | 87 | 222 |
| 25EHRC044 | Eaglehawk | 658321 | 7061701 | 510 | -60 | 87 | 216 |
| 25EHRC045 | Eaglehawk | 658448 | 7061764 | 509 | -60 | 200 | 186 |
| 25EHRC046 | Eaglehawk | 658462 | 7061803 | 509 | -60 | 200 | 210 |
| 25EHRC047 | Eaglehawk | 658381 | 7061835 | 509 | -63 | 193 | 220 |
| 25EHRC048 | Eaglehawk | 658404 | 7061809 | 509 | -63 | 195 | 210 |
| 25EHRC049 | Eaglehawk | 658362 | 7061785 | 509 | -60 | 196 | 155 |
ASX Code: GBR Contact: Andrew Paterson, Managing Director E: [email protected] GREATBOULDER.COM.AU P: +61 8 9321 6037 Level 1, 51 Colin St West Perth WA 6005 ABN 70 611 695 955
ASX Announcement
17
8 DECEMBER 2025
==> picture [48 x 57] intentionally omitted <==
==> picture [48 x 57] intentionally omitted <==
| Hole ID | Prospect | Easting | Northing | RL | Dip | Azi | Total |
|---|---|---|---|---|---|---|---|
| (Mag) | Depth | ||||||
| 25EHRC050 | Eaglehawk | 658505 | 7061975 | 509 | -60 | 90 | 114 |
TABLE 6: COLLAR DETAILS – RECENT AC DRILLING (GDA94, ZONE 50)
| Hole ID | Prospect | Easting | Northing | RL |
Dip | Azi | Total Depth |
|---|---|---|---|---|---|---|---|
| (Mag) | |||||||
| 25SWAC455 | Flagpole | 658159 | 7056700 |
514 |
-60 | 90 | 136 |
| 25SWAC456 | Flagpole | 658132 | 7056700 |
514 |
-60 | 90 | 143 |
| 25SWAC457 | Flagpole | 658160 | 7056760 |
514 |
-60 | 90 | 128 |
| 25SWAC458 | Flagpole | 658107 | 7056760 |
514 |
-60 | 90 | 129 |
| 25SWAC459 | Flagpole | 658212 | 7056896 |
514 |
-60 | 90 | 122 |
| 25SWAC460 | Flagpole | 658177 | 7056900 |
514 |
-60 | 90 | 135 |
| 25SWAC461 | Flagpole | 658033 | 7056903 |
514 |
-60 | 90 | 146 |
| 25SWAC462 | Flagpole | 658169 | 7056925 |
514 |
-60 | 90 | 165 |
| 25SWAC463 | Flagpole | 658123 | 7056925 |
514 |
-60 | 90 | 168 |
| 25SWAC464 | Flagpole | 658161 | 7056950 |
514 |
-60 | 90 | 183 |
| 25SWAC465 | Flagpole | 658156 | 7056975 |
514 |
-60 | 90 | 135 |
| 25SWAC466 | Flagpole | 658183 | 7057000 |
514 |
-60 | 90 | 159 |
| 25SWAC467 | Flagpole | 658164 | 7057000 |
514 |
-60 | 90 | 168 |
| 25SWAC468 | Flagpole | 658091 | 7057000 |
514 |
-60 | 90 | 143 |
| 25SWAC469 | Flagpole | 658222 | 7056700 |
514 |
-60 | 90 | 111 |
| 25SWAC470 | Flagpole | 658273 | 7056760 |
514 |
-60 | 90 | 132 |
| 25SWAC471 | Flagpole | 658217 | 7056760 |
514 |
-60 | 90 | 111 |
| 25SWAC472 | Flagpole | 658222 | 7056826 |
514 |
-60 | 90 | 120 |
| 25SWAC473 | Flagpole | 658122 | 7056895 |
514 |
-60 | 90 | 114 |
| 25SWAC474 | Flagpole | 658362 | 7056896 |
514 |
-60 | 90 | 104 |
| 25SWAC475 | Flagpole | 658312 | 7056896 |
514 |
-60 | 90 | 105 |
| 25SWAC476 | Flagpole | 658262 | 7056896 |
514 |
-60 | 90 | 114 |
| 25SWAC477 | Flagpole | 658382 | 7057000 |
514 |
-60 | 90 | 108 |
| 25SWAC478 | Flagpole | 658332 | 7057000 |
514 |
-60 | 90 | 116 |
| 25SWAC479 | Flagpole | 658282 | 7057000 |
514 |
-60 | 90 | 117 |
| 25SWAC480 | Flagpole | 658232 | 7057000 |
514 |
-60 | 90 | 120 |
| 25SWAC481 | Flagpole | 658162 | 7057042 |
514 |
-60 | 90 | 150 |
| 25SWAC482 | Flagpole | 658251 | 7057140 |
514 |
-60 | 90 | 144 |
| 25SWAC483 | Flagpole | 658195 | 7057140 |
514 |
-60 | 90 | 144 |
| 25SWAC484 | Flagpole | 658140 | 7057140 |
514 |
-60 | 90 | 129 |
| 25SWAC485 | Flagpole | 658085 | 7057140 |
514 |
-60 | 90 | 102 |
| 25SWAC486 | Flagpole | 658540 | 7057200 |
514 |
-60 | 90 | 102 |
| 25SWAC487 | Flagpole | 658478 | 7057200 |
514 |
-60 | 90 | 96 |
| 25SWAC488 | Flagpole | 658416 | 7057200 |
514 |
-60 | 90 | 108 |
| 25SWAC489 | Flagpole | 658374 | 7057265 |
514 |
-60 | 90 | 117 |
ASX Code: GBR Contact: Andrew Paterson, Managing Director E: [email protected] GREATBOULDER.COM.AU P: +61 8 9321 6037 Level 1, 51 Colin St West Perth WA 6005 ABN 70 611 695 955
ASX Announcement
18
8 DECEMBER 2025
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==> picture [48 x 57] intentionally omitted <==
| Hole ID | Prospect | Easting | Northing | RL |
Dip | Azi | Total Depth |
|---|---|---|---|---|---|---|---|
| (Mag) | |||||||
| 25SWAC490 | Flagpole | 658314 | 7057265 |
514 |
-60 | 90 | 48 |
| 25SWAC491 | Flagpole | 658255 | 7057265 |
514 |
-60 | 90 | 132 |
| 25SWAC492 | Flagpole | 658205 | 7057265 |
514 |
-60 | 90 | 120 |
| 25SWAC493 | Flagpole | 658155 | 7057265 |
514 |
-60 | 90 | 147 |
| 25SWAC494 | Flagpole | 658494 | 7057330 |
514 |
-60 | 90 | 90 |
| 25SWAC495 | Flagpole | 658434 | 7057330 |
514 |
-60 | 90 | 117 |
| 25SWAC496 | Flagpole | 659044 | 7056800 |
514 |
-60 | 90 | 93 |
| 25SWAC497 | Flagpole | 658989 | 7056800 |
514 |
-60 | 90 | 45 |
| 25SWAC498 | Flagpole | 658934 | 7056800 |
514 |
-60 | 90 | 42 |
| 25SWAC499 | Flagpole | 658879 | 7056800 |
514 |
-60 | 90 | 80 |
| 25SWAC500 | Flagpole | 657884 | 7057000 |
514 |
-60 | 90 | 120 |
| 25SWAC501 | Flagpole | 657834 | 7057000 |
514 |
-60 | 90 | 114 |
| 25SWAC502 | Flagpole | 657784 | 7057000 |
514 |
-60 | 90 | 96 |
| 25SWAC503 | Flagpole | 657734 | 7057000 |
514 |
-60 | 90 | 105 |
| 25SWAC504 | Flagpole | 657684 | 7057000 |
514 |
-60 | 90 | 105 |
| 25SWAC505 | Flagpole | 657924 | 7057200 |
514 |
-60 | 90 | 120 |
| 25SWAC506 | Flagpole | 657874 | 7057200 |
514 |
-60 | 90 | 136 |
| 25SWAC507 | Flagpole | 657824 | 7057200 |
514 |
-60 | 90 | 122 |
| 25SWAC508 | Flagpole | 657774 | 7057200 |
514 |
-60 | 90 | 114 |
| 25SWAC509 | Flagpole | 657724 | 7057200 |
514 |
-60 | 90 | 144 |
| 25SWAC510 | Flagpole | 657864 | 7056800 |
514 |
-60 | 90 | 126 |
| 25SWAC511 | Flagpole | 657814 | 7056800 |
514 |
-60 | 90 | 120 |
| 25SWAC512 | Flagpole | 657764 | 7056800 |
514 |
-60 | 90 | 102 |
| 25SWAC513 | Flagpole | 657714 | 7056800 |
514 |
-60 | 90 | 95 |
| 25SWAC514 | Flagpole | 657664 | 7056800 |
514 |
-60 | 90 | 108 |
E: [email protected] GREATBOULDER.COM.AU ABN 70 611 695 955
ASX Code: GBR Contact: Andrew Paterson, Managing Director P: +61 8 9321 6037 Level 1, 51 Colin St West Perth WA 6005
ASX Announcement
19
8 DECEMBER 2025
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==> picture [48 x 57] intentionally omitted <==
Appendix 1 - JORC Code, 2012 Edition Table 1 (GBR Drilling, Side Well Project)
Section 1 Sampling Techniques and Data
(Criteria in this section apply to all succeeding sections.)
| Criteria | Commentary |
|---|---|
| Sampling techniques | At the Side Well Project GBR has collected data from auger sampling and from AC, RC and Diamond drilling techniques. This section encompasses all four methods. RC samples are collected into calico bags over 1m intervals using a cyclone splitter. The residual bulk samples are placed in lines of piles on the ground. 2 cone splits are taken off the rig splitter for RC drilling. Visually prospective zones are sampled over 1m intervals and sent for analysis while the rest of the hole is composited over 4m intervals by taking a scoop sample from each 1m bag. Core samples are selected visually based on observations of alteration and mineralisation and sampled to contacts or metre intervals as appropriate. Once samples are marked the core is cut in half longitudinally with one half taken for assay and the other half returned to the core tray. All core is oriented in order to measure and record structural orientations. AC samples are placed in piles on the ground with 4m composite samples taken using a scoop. Any composite samples assaying 0.1g/t Au or more are re-assayed in 1m intervals. Auger samples are recovered from the auger at blade refusal depth. Auger drilling is an open-hole technique. |
| Drilling techniques | Industry standard drilling methods and equipment were utilised. Auger drilling was completed using a petrol-powered hand-held auger. |
| Drill sample recovery | Sample recovery data is noted in geological comments as part of the logging process. Sample condition has been logged for every geological interval as part of the logging process. Where water is encountered during drilling the resultant sample quality is noted as being dry, moist or wet. No quantitative twinned drilling analysis has been undertaken. |
| Logging | Geological logging of drilling followed established company procedures. Qualitative logging of samples includes lithology, mineralogy, alteration, veining and weathering. Abundant geological comments supplement logged intervals. |
| Sub-sampling techniques and sample preparation |
1m cyclone splits and 4m speared composite samples are taken in the field. Samples are prepared and analysed at ALS Laboratories Perth for RC and diamond drilling and Intertek Laboratories for the AC drilling and auger soil samples. Samples are pulverized so that each sample has a nominal grainsize of 85% passing 75 microns. Au analysis is undertaken using Au-AA26 involving a 50g lead collection fire assay and Atomic Adsorption Spectrometry (AAS) finish. For AC drilling, Au analysis is undertaken at Intertek using a 50g lead collection fire assay with ICP-OES finish (FA50/OE). Multi-element analysis is completed at both ALS and Intertek Laboratories. Digestion is completed using both 4 Acid and Aqua-regia and analysed by ICP-AES and ICP-MS (Intertek code 4A/MS48, ALS codes ME-MS61, ME-ICP41-ABC). |
| Quality of assay data and laboratory tests |
All samples are assayed by industry standard techniques: Fire assay for gold; four-acid digest and aqua regia for multi-element analysis. |
| Verification of sampling and assaying |
The standard GBR protocol is followed for insertion of standards and blanks with a blank and standard inserted per 25 for RC drilling and 40 samples for AC drilling. Field Duplicates as second cone splits are inserted within known ore zones to assess repeatability. Analysis of ME is typically done on master pulps after standard gold analysis with a company multi-element standard inserted every 50 samples. No QAQC problems were identified in the results. No twinned drilling has been undertaken. |
| Location of data points | Sample locations and mapping observations are located and recorded electronically using a handheld GPS. Coordinates are recorded in GDA94 grid in Zone 50, which is the GDA94 zone for the Meekatharra area. |
ASX Code: GBR Contact: Andrew Paterson, Managing Director E: [email protected] P: +61 8 9321 6037 Level 1, 51 Colin St West Perth WA 6005 ABN 70 611 695 955
GREATBOULDER.COM.AU
ASX Announcement
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8 DECEMBER 2025
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==> picture [48 x 57] intentionally omitted <==
| Drill holes are positioned using the same technique. Hole collars are initially picked up after drilling using a handheld GPS. RC and Diamond hole collars are subsequently surveyed with a DGPS for greater accuracy. This accuracy is sufficient for the intended purpose of the data. |
|
|---|---|
| Data spacing and distribution |
The spacing and location of the majority of drilling in the projects is, by the nature of early exploration, variable. As each prospect advances the drill spacing is decreased until the confidence of continuity is sufficient to allow the estimation of a mineral resource. Resource classification (e.g. Inferred or Indicated) is assigned by an independent resource consultant. The spacing and location of data is currently only being considered for exploration purposes. |
| Orientation of data in relation to geological structure |
Drilling is dominantly perpendicular to regional geological trends where interpreted and practical. Wherever possible, cross sections are shown to give a visual indication of the relationship between intersection width and lode thickness. The spacing and location of the data is currently only being considered for exploration purposes. |
| Sample security | GBR personnel are responsible for delivery of samples from the drill site to the Toll Ipec dispatch centre in Meekatharra. Samples are transported by Toll Ipec from Meekatharra to the laboratories in Perth. |
| Audits or reviews | Data review and interpretation by independent consultants on a regular basis. Group technical meetings are usually held monthly with input from independent expert consultants in the fields of geochemistry, petrology, structural geology and geophysics. |
Section 2 Reporting of Exploration Results
(Criteria listed in the preceding section also apply to this section.)
| Criteria | Commentary |
|---|---|
| Mineral tenement and land tenure status |
Side Well tenement E51/1905 is a 48-block exploration license covering an area of 131.8km2 immediately east and northeast of Meekatharra in the Murchison province. The tenement is 75% owned by Great Boulder, with Zebina Minerals Pty Ltd holding a 25% free-carried interest up to a decision to mine. E51/1679 and the adjoining prospecting licences south of E5/1905 are mainly held in agreements with Mark Selga and Wanbanna Pty Ltd which give GBR an 80% interest in those tenements. P51/3361, P51/3362, P51/3358, P51,3419 and P51/3425 are 100%-owned by GBR. A full list of the Company’s tenement interests is included in each quarterly activities report available on the ASX. |
| Exploration done by other parties |
The Side Well project has a protracted exploration history but it is relatively unexplored compared to other regions surrounding Meekatharra. |
| Geology | The Side Well tenement group covers a portion of the Meekatharra-Wydgee Greenstone Belt north of Meekatharra, WA. The north-northeasterly-trending Archaean Meekatharra-Wydgee Greenstone Belt, comprises a succession of metamorphosed mafic to ultramafic and felsic and sedimentary rocks belonging to the Luke Creek and Mount Farmer Groups. Over the northern extensions of the belt, sediments belonging to the Proterozoic Yerrida Basin unconformably overlie Archaean granite-greenstone terrain. Structurally, the belt takes the form of a syncline known as the Polelle syncline. Younger Archaean granitoids have intrusive contacts with the greenstone succession and have intersected several zones particularly in the Side Well area. Within the Side Well tenement group, a largely concealed portion of the north-north-easterly trending Greenstone Belt is defined, on the basis of drilling and airborne magnetic data, to underlie the area. The greenstone succession is interpreted to be tightly folded into a south plunging syncline and is cut by easterly trending Proterozoic dolerite dykes. There is little to no rock exposure at the Side Well prospect. This area is covered by alluvium and lacustrine clays, commonly up to 60 metres thick. Subcrop exposures of laterite, mafic and ultramafic rocks are present along the eastern side of the project, however exposure of outcrop is still relatively poor. |
E: [email protected] GREATBOULDER.COM.AU ABN 70 611 695 955
ASX Code: GBR Contact: Andrew Paterson, Managing Director P: +61 8 9321 6037 Level 1, 51 Colin St West Perth WA 6005
ASX Announcement
21
8 DECEMBER 2025
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==> picture [48 x 57] intentionally omitted <==
| Drill hole Information | A list of the drill hole coordinates, orientations and intersections reported in this announcement are provided as an appended table in the relevant announcements for each drilling program. |
|---|---|
| Data aggregation methods |
Results are reported using cut-off levels relevant to the sample type. For composited samples significant intercepts are reported for grades greater than 0.1g/t Au with a maximum internal dilution of 4m. For single metre splits, significant intercepts are reported for grades greater than 0.5g/t Au with a maximum internal dilution of 3m. A weighted average calculation may be used to allow for bottom of hole composites that are less than the standard 4m and when intervals contain composited samples plus 1m split samples. In such instances the presence of composite samples within the intersection is noted in the comments. No metal equivalents are used. |
| Relationship between mineralisation widths and intercept lengths |
The majority of drilling is conducted using appropriate perpendicular orientations for interpreted mineralisation. Stratigraphy appears to be steeply dipping to the west however mineralisation may have a different orientation. Cross sections are shown wherever possible to illustrate relationships between drilling and interpreted mineralisation. |
| Diagrams | Refer to figures in announcement. |
| Balanced reporting | It is not practical to report all historical exploration results from the Side Well project. Selected historical intercepts have previously been re-reported by GBR to highlight the prospectivity of the region, however the vast majority of work on the project has been completed by GBR and reported in ASX announcements since 14 July 2020. |
| Other substantive exploration data |
Subsequent to Doray Minerals Limited exiting the project in 2015, private companies have held the ground with no significant work being undertaken. Wanbanna Pty Ltd has done limited work consisting mainly of AC drilling around the Burke’s Reward and Golden Bracelet prospect’s further south. |
| Further work | Further work is discussed in the document. |
E: [email protected] GREATBOULDER.COM.AU ABN 70 611 695 955
ASX Code: GBR Contact: Andrew Paterson, Managing Director P: +61 8 9321 6037 Level 1, 51 Colin St West Perth WA 6005