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GREAT BOULDER RESOURCES LIMITED — Capital/Financing Update 2025
Aug 17, 2025
64967_rns_2025-08-17_babcb396-d89c-4603-88f9-90b1483a6020.pdf
Capital/Financing Update
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ASX Announcement
18 AUGUST 2025
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HIGH-GRADE INTERSECTIONS BOLSTER EAGLEHAWK
PLUS FURTHER HIGH GRADES IN METALLURGICAL DRILLING AT IRONBARK
HIGHLIGHTS
- ➢ Resource definition drilling at Eaglehawk has intersected new high-grade gold mineralisation outside the current lode interpretation, highlights include:
Hole 5EHRC003 – Intersected four high-grade zones
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8m @ 29.18g/t Au from 128m, incl. 4m @ 54.80g/t Au from 128m;
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12m @ 4.63g/t Au from 68m;
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28m @ 1.73g/t Au, incl. 5m @ 3.74g/t Au from 182m; and
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4m @ 14.85g/t Au from 196m to End of Hole
Hole 25EHRC006 - 6m @ 5.11g/t Au from 123m, incl. 2m @ 12.58g/t Au from 124m
Hole 25EHRC008 - 6m @ 7.03g/t Au from 98m, incl. 1m @ 26.20g/t Au from 99m
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➢ Ironbark infill drilling delivered grades exceeding the current resource grade with hole 25IBWR004 intersecting high-grade gold at the bottom of the current resource model Hole 25IBWR004 - 9m @ 4.97g/t Au from 144m, incl. 1m @ 33.40g/t Au from 149m and Hole 25IBWR002 - 11m @ 3.72g/t Au from 105m, incl. 7m @ 5.33g/t Au from 105m
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➢ Assays from a further 17 RC holes at Eaglehawk are expected shortly
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➢ RC drilling is ongoing at Side Well South completing resource definition drilling
Great Boulder Resources (“ Great Boulder ” or the “ Company ”) (ASX: GBR ) is pleased to provide an update on exploration results at the Company’s flagship Side Well Gold Project (“ Side Well ”) near Meekatharra in Western Australia which hosts a Mineral Resource Estimate (“ MRE ”) of 668,000oz @ 2.8 g/t Au.
Great Boulder’s Managing Director, Andrew Paterson commented:
“These are some fantastic intersections from Eaglehawk, which demonstrates the capacity of this gold system to deliver high-grade surprises! We need to do more drilling to confirm the orientation of these new zones, but our geological logging suggests there may be two or three new west-dipping high-grade veins and possibly one thicker subvertical zone. All of these intersections are outside the dacite target lithology which is where we’ve seen the really high grades in previous drilling.”
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 18 AUGUST 2025
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“Our waste characterisation drilling at Ironbark has also delivered good news, with an intersection at the bottom of the current resource which is thicker and higher grade than we expected. That result provides further scope for depth extensions under the current Ironbark pit design.”
“The RC rig is now completing a phase of resource definition drilling at Side Well South and we’re expecting a second rig on site at the end of August, so the team will be very busy for the rest of the year with a combination of resource growth drilling and testing new discovery targets.”
27 RC holes were drilled for 4,544m at Eaglehawk. This included 21 RC resource definition holes within the Eaglehawk deposit, and six RC holes in the “gap” area between Mulga Bill and Eaglehawk (Figure 1). Assays have been received for the first 10 holes, with the balance expected to be received shortly.
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FIGURE 1: RECENT HIGH-GRADE RESULTS FROM EAGLEHAWK
E: [email protected] GREATBOULDER.COM.AU ABN 70 611 695 955
ASX Code: GBR P: +61 8 9321 6037
Contact: Andrew Paterson, Managing Director Level 1, 51 Colin St West Perth WA 6005
ASX Announcement
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18 AUGUST 2025
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Highlights from the results received to date include:
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12m @ 4.63g/t Au from 68m, including 5m @ 8.62g/t Au from 72m in 25EHRC003
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8m @ 29.18g/t Au from 128m, including 4m @ 54.80g/t Au from 128m in 25EHRC003
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28m @ 1.73g/t Au, including 5m @ 3.74g/t Au from 182m in 25EHRC003
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4m @ 14.85g/t Au from 196m to EOH (4m composite sample) in 25EHRC003
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6m @ 5.11g/t Au from 123m, including 2m @ 12.58g/t Au from 124m in 25EHRC006
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6m @ 7.03g/t Au , including 1m @ 26.20g/t Au from 99m in 25EHRC008
Further drilling is required to confirm the orientations of the multiple mineralised zones intersected by hole 25EHRC003 (Figure 2). High-grade mineralisation remains open beyond the bottom of the hole, with a 4m end-of-hole (EOH) composite sample grading 14.85g/t Au .
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FIGURE 2: CROSS-SECTION SHOWING THE MULTIPLE HIGH-GRADE INTERSECTIONS IN HOLE 25EHRC003
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 18 AUGUST 2025
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25EHRC003 is interpreted to have intersected two or possibly three west-dipping high-grade structures, including the intersection of 12m @ 4.63g/t Au from 68m which is partly influenced by supergene effects due to weathering. The broader, lower intersection of 28m @ 1.73g/t Au has characteristics of the sub-vertical, shear-hosted lodes similar to those referred to as the Malvern Lodes within Mulga Bill. These lodes have excellent continuity along strike (at Mulga Bill) but have not yet been confirmed within the Eaglehawk deposit.
The thickness and orientation of the end-of-hole mineralisation is unknown at this point, pending further drilling.
Five RC holes for 655m were drilled at Ironbark as part of the ongoing technical studies required for a mining approval application. These holes were designed to provide material for waste rock characterisation, with some also positioned to provide additional material for metallurgical samples within the deposit. High-grade intersections from this program include:
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9m @ 4.97g/t Au from 144m, including 1m @ 33.40g/t Au from 149m in 25IBWR004
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11m @ 3.72g/t Au from 105m, including 7m @ 5.33g/t Au from 105m in 25IBWR002.
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FIGURE 3: IRONBARK CROSS-SECTION SHOWING HOLE 25IBWR004 IN RELATION TO THE MINERAL RESOURCE AND THE SCOPING STUDY PIT DESIGN
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
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18 AUGUST 2025
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The high-grade intersection in hole 25IBWR004 is within the middle of the deposit and at the bottom of the current mineral resource (Figure 3), with higher gold grades than previously interpreted from earlier drilling. This provides additional scope for depth extensions below the current resource.
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FIGURE 4: PLAN VIEW OF RECENT RESULTS FROM IRONBARK
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
6
18 AUGUST 2025
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Next Steps
The RC rig has now returned to Side Well South to complete a phase of RC holes designed to continue defining recently discovered gold mineralisation north of the historic Golden Bracelet area. This drilling is intended to define mineralisation with sufficient confidence to allow the estimation of an initial Mineral Resource Estimate.
An AC rig is expected to arrive at Side Well towards the end of August. This rig will allow the Side Well growth and discovery program to be accelerated throughout the remainder of the year and into 2026. Further information on planned drilling will be provided in future market updates.
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FIGURE 5: A PROJECTED LONG SECTION THROUGH MULGA BILL & EAGLEHAWK
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
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Media Lucas Robinson Corporate Storytime +61 408 228 889 [email protected]
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Follow GBR on LinkedIn
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Follow GBR on Twitter
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 18 AUGUST 2025
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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.
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FIGURE 6: THE SIDE WELL GOLD PROJECT IS STRATEGICALLY LOCATED, SURROUNDED BY MINING AND CIVIL INFRASTRUCTURE
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
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18 AUGUST 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.
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
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18 AUGUST 2025
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TABLE 2: SIGNIFICANT INTERSECTIONS: EAGLEHAWK RC DRILLING
| Prospect | Hole ID | From | To | Width | Grade Comments |
|---|---|---|---|---|---|
| Eaglehawk | 25EHRC001 | 96 | 98 | 2 | 1.12 |
| 100 | 102 | 2 | 1.01 | ||
| 25EHRC002 | 76 | 77 | 1 | 0.74 | |
| 80 | 81 | 1 | 0.90 | ||
| 84 | 88 | 4 | 0.33 4m composite | ||
| 139 | 140 | 1 | 0.75 | ||
| 25EHRC003 | 24 | 32 | 8 | 0.17 4m composites | |
| 68 | 80 | 12 | 4.634m comps 68 - 76m | ||
| Including | 72 | 77 | 5 | 8.624m comp 72 - 76m | |
| 128 | 136 | 8 | 29.184m composites | ||
| Including | 128 | 132 | 4 | 54.80 | |
| 160 | 188 | 28 | 1.734m comps to 180m | ||
| 182 | 187 | 5 | 3.74 | ||
| 196 | 200 | 4 | 14.854m composite | ||
| 25EHRC004 | 76 | 84 | 8 | 0.67 4m composites | |
| 89 | 91 | 2 | 2.25 | ||
| 25EHRC005 | 80 | 84 | 4 | 0.12 4m composite | |
| 88 | 92 | 4 | 0.14 4m composite | ||
| 116 | 120 | 4 | 0.18 4m composite | ||
| 120 | 121 | 1 | 1.57 | ||
| 131 | 132 | 1 | 1.54 | ||
| 135 | 138 | 3 | 1.20 | ||
| 25EHRC006 | 28 | 32 | 4 | 0.48 4m composite | |
| 40 | 44 | 4 | 0.41 4m composite | ||
| 115 | 116 | 1 | 0.53 | ||
| 119 | 121 | 2 | 0.77 | ||
| 123 | 129 | 6 | 5.11 | ||
| Including | 124 | 126 | 2 | 12.58 | |
| 168 | 172 | 4 | 0.19 4m composite | ||
| 188 | 192 | 4 | 0.10 4m composite | ||
| 200 | 204 | 4 | 0.13 4m composite | ||
| 25EHRC007 | 49 | 50 | 1 | 0.61 | |
| 64 | 68 | 4 | 0.36 4m composite | ||
| 84 | 87 | 3 | 0.87 | ||
| 116 | 120 | 4 | 0.15 4m composite | ||
| 25EHRC008 | 32 | 36 | 4 | 0.27 4m composite | |
| 67 | 68 | 1 | 0.50 | ||
| 69 | 70 | 1 | 0.62 | ||
| 98 | 104 | 6 | 7.03 | ||
| Including | 99 | 100 | 1 | 26.20 | |
| 107 | 108 | 1 | 0.83 | ||
| 118 | 123 | 5 | 0.97 | ||
| 130 | 131 | 1 | 0.79 |
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
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18 AUGUST 2025
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| 25EHRC009 77 78 1 0.79 83 84 1 0.60 |
25EHRC009 77 78 1 0.79 83 84 1 0.60 |
|---|---|
| 25EHRC009 77 78 1 0.79 83 84 1 0.60 |
|
| 25EHRC010 84 88 4 0.11 4m composite 96 100 4 2.41 4m composite 164 165 1 2.28 |
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.
TABLE 3: SIGNIFICANT INTERSECTIONS: IRONBARK WASTE CHARACTERISATION DRILLING
| Prospect | Hole ID | From | To | Width | Grade Comments |
|---|---|---|---|---|---|
| Ironbark | 25IBWR001 | 28 | 32 | 6 | 1.02 4m composite |
| 38 | 39 | 1 | 1.77 | ||
| 47 | 48 | 1 | 0.60 | ||
| 53 | 64 | 11 | 0.68 4m composites | ||
| 25IBWR002 | 4 | 8 | 4 | 0.23 4m composite | |
| 94 | 96 | 2 | 2.48 | ||
| 105 | 116 | 11 | 3.724m composites | ||
| including | 105 | 112 | 7 | 5.334m composite | |
| 25IBWR003 | 16 | 40 | 24 | 0.37 4m composites | |
| 25IBWR004 | 144 | 153 | 9 | 4.974m composite | |
| including | 149 | 150 | 1 | 33.40 | |
| 156 | 157 | 1 | 0.65 | ||
| 160 | 164 | 4 | 0.22 4m composite | ||
| 25IBWR005 | 36 | 40 | 4 | 0.53 4m composite | |
| 46 | 47 | 1 | 0.79 |
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.
TABLE 4: SIGNIFICANT INTERSECTIONS: MULGA BILL AIR-CORE DRILLING
| Prospect | Hole ID | From | To | Width | Grade Comments |
|---|---|---|---|---|---|
| Mulga Bill | 25SWAC196 | 32 | 36 | 4 | 0.12 4m Composite |
| 104 | 111 | 4 | 0.27 EOH 4m Composites | ||
| 25SWAC197 | 92 | 96 | 4 | 0.58 4m Composite | |
| 25SWAC198 | 40 | 44 | 4 | 0.10 4m Composite | |
| 109 | 113 | 4 | 1.57EOH | ||
| Including | 109 | 110 | 1 | 2.82 | |
| 25SWAC199 | 24 | 28 | 4 | 0.10 4m Composite | |
| 84 | 88 | 4 | 0.23 4m Composite | ||
| 104 | 111 | 7 | 0.37 4m Composite | ||
| 25SWAC200 | 107 | 108 | 1 | 0.56 | |
| 124 | 127 | 4 | 0.11 EOH. 4m composite | ||
| 25SWAC201 | 0 | 97 | 97 | No significant intersection |
ASX Code: GBR Contact: Andrew Paterson, Managing Director P: +61 8 9321 6037 Level 1, 51 Colin St West Perth WA 6005
E: [email protected] GREATBOULDER.COM.AU ABN 70 611 695 955
ASX Announcement
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18 AUGUST 2025
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| 25SWAC202 64 68 4 0.89 4m Composite |
25SWAC202 64 68 4 0.89 4m Composite |
|---|---|
| 25SWAC202 64 68 4 0.89 4m Composite |
|
| 25SWAC203 0 112 112 No significant intersection |
|
| 25SWAC204 36 40 4 0.13 4m composite 76 80 4 0.18 4m composite 84 90 6 0.25 4m composite |
|
| 25SWAC205 20 24 4 0.12 4m composite 28 40 12 0.32 4m composites 44 48 4 0.20 4m composite 104 111 7 1.23 EOH. 4m and 3m composite |
|
| 25SWAC206 60 64 4 0.14 4m composite 72 84 12 1.454m composites |
|
| 25SWAC207 48 52 4 0.11 4m composite 64 80 16 0.27 4m composites |
|
| 25SWAC208 64 68 4 0.66 4m composite |
|
| 25SWAC209 60 64 4 0.12 4m composite 68 72 4 0.30 4m composite 76 88 12 0.24 4m composites |
|
| 25SWAC210 57 58 1 0.99 68 70 2 0.16 EOH. 2m Composite |
|
| 25SWAC211 68 72 4 0.29 4m composite |
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.
TABLE 5: COLLAR DETAILS: RC DRILLING (GDA94, ZONE 50)
| Hole ID | Prospect | Easting | Northing | RL | Dip | Azi | Total |
|---|---|---|---|---|---|---|---|
| (Mag) | Depth | ||||||
| 25IBWR001 | Ironbark | 660106 | 7059126 | 518 | -60 | 90 | 92 |
| 25IBWR002 | Ironbark | 660060 | 7059025 | 517 | -60 | 90 | 165 |
| 25IBWR003 | Ironbark | 660114 | 7058950 | 517 | -60 | 90 | 86 |
| 25IBWR004 | Ironbark | 660003 | 7058875 | 517 | -60 | 90 | 212 |
| 25IBWR005 | Ironbark | 660061 | 7058774 | 517 | -60 | 90 | 100 |
| 25EHRC001 | Eaglehawk | 658411 | 7061625 | 509 | -60 | 90 | 120 |
| 25EHRC002 | Eaglehawk | 658438 | 7061676 | 509 | -60 | 90 | 160 |
| 25EHRC003 | Eaglehawk | 658331 | 7061726 | 509 | -60 | 90 | 200 |
| 25EHRC004 | Eaglehawk | 658430 | 7061725 | 509 | -60 | 90 | 120 |
| 25EHRC005 | Eaglehawk | 658412 | 7061800 | 509 | -60 | 90 | 176 |
| 25EHRC006 | Eaglehawk | 658368 | 7061800 | 509 | -60 | 90 | 207 |
| 25EHRC007 | Eaglehawk | 658490 | 7061900 | 509 | -60 | 90 | 195 |
| 25EHRC008 | Eaglehawk | 658465 | 7061952 | 509 | -60 | 90 | 165 |
| 25EHRC009 | Eaglehawk | 658384 | 7061950 | 509 | -60 | 90 | 159 |
| 25EHRC010 | Eaglehawk | 658458 | 7062025 | 509 | -60 | 90 | 207 |
| 25EHRC011 | Eaglehawk | 658490 | 7062050 | 509 | -60 | 90 | 171 |
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
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18 AUGUST 2025
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| 25EHRC012 | Eaglehawk | 658413 | 7062050 | 509 | -60 | 90 | 194 |
|---|---|---|---|---|---|---|---|
| 25EHRC013 | Eaglehawk | 658368 | 7062050 | 509 | -60 | 90 | 230 |
| 25EHRC014 | Eaglehawk | 658517 | 7062100 | 509 | -60 | 90 | 182 |
| 25EHRC015 | Eaglehawk | 658434 | 7062225 | 508 | -60 | 90 | 186 |
| 25EHRC016 | Eaglehawk | 658514 | 7062300 | 509 | -60 | 90 | 152 |
| 25EHRC017 | Eaglehawk | 658478 | 7062400 | 508 | -60 | 90 | 158 |
| 25EHRC018 | Eaglehawk | 658463 | 7062350 | 509 | -60 | 90 | 199 |
| 25EHRC019 | Eaglehawk | 658594 | 7062650 | 509 | -60 | 90 | 156 |
| 25EHRC020 | Eaglehawk | 658533 | 7062650 | 509 | -60 | 90 | 172 |
| 25EHRC021 | Eaglehawk | 658582 | 7062700 | 507 | -60 | 90 | 165 |
| 25MBRC021 | Mulga Bill | 658414 | 7061500 | 510 | -60 | 87 | 159 |
| 25MBRC022 | Mulga Bill | 658474 | 7061475 | 510 | -60 | 87 | 111 |
| 25MBRC023 | Mulga Bill | 658414 | 7061475 | 510 | -60 | 87 | 171 |
| 25MBRC024 | Mulga Bill | 658504 | 7061450 | 510 | -60 | 87 | 102 |
| 25MBRC025 | Mulga Bill | 658438 | 7061425 | 510 | -60 | 87 | 144 |
| 25MBRC026 | Mulga Bill | 658378 | 7061450 | 510 | -60 | 87 | 183 |
TABLE 6: COLLAR DETAILS: AC DRILLING (GDA94, ZONE 50)
| Hole ID | Prospect | Easting | Northing | RL | Dip | Azi | Total |
|---|---|---|---|---|---|---|---|
| (Mag) | Depth | ||||||
| 25SWAC196 | Mulga Bill | 658724 | 7060850 | 511 | -60 | 90 | 111 |
| 25SWAC197 | Mulga Bill | 658664 | 7060850 | 511 | -60 | 90 | 123 |
| 25SWAC198 | Mulga Bill | 658604 | 7060850 | 511 | -60 | 90 | 113 |
| 25SWAC199 | Mulga Bill | 658544 | 7060850 | 511 | -60 | 90 | 117 |
| 25SWAC200 | Mulga Bill | 658484 | 7060850 | 511 | -60 | 90 | 127 |
| 25SWAC201 | Mulga Bill | 658783 | 7060975 | 511 | -60 | 90 | 97 |
| 25SWAC202 | Mulga Bill | 658735 | 7060975 | 511 | -60 | 91 | 102 |
| 25SWAC203 | Mulga Bill | 658685 | 7060975 | 511 | -60 | 87 | 112 |
| 25SWAC204 | Mulga Bill | 658634 | 7060975 | 511 | -60 | 90 | 108 |
| 25SWAC205 | Mulga Bill | 658653 | 7060975 | 511 | -60 | 90 | 111 |
| 25SWAC206 | Mulga Bill | 658674 | 7061150 | 511 | -60 | 90 | 94 |
| 25SWAC207 | Mulga Bill | 658614 | 7061150 | 511 | -60 | 90 | 100 |
| 25SWAC208 | Mulga Bill | 658554 | 7061150 | 511 | -60 | 90 | 93 |
| 25SWAC209 | Mulga Bill | 658675 | 7061253 | 511 | -60 | 90 | 90 |
| 25SWAC210 | Mulga Bill | 658614 | 7061258 | 511 | -60 | 90 | 70 |
| 25SWAC211 | Mulga Bill | 658557 | 7061257 | 511 | -60 | 90 | 90 |
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
13
18 AUGUST 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
935.4M ~$12.5M
SHARES ON ISSUE ASX:GBR
CASH As at 30 June 25
~$51M
Nil
MARKET CAP DEBT At $0.062/sh As at 31 March 25
$900k $263k LISTED INVESTMENT DAILY LIQUIDITY Cosmo Metals (ASX:CMO) Average 30-day value traded 80.0M ~36% UNLISTED OPTIONS TOP 20 OWNERSHIP
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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
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18 AUGUST 2025
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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
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| 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] 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
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ASX Announcement
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18 AUGUST 2025
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| 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] 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
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