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GREAT BOULDER RESOURCES LIMITED Capital/Financing Update 2022

Mar 21, 2022

64967_rns_2022-03-21_de5c2672-8c6b-4909-aa0e-7366f2a558c4.pdf

Capital/Financing Update

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ASX Announcement
22 MARCH 2022
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MULGA BILL PHASE 5 DRILL RESULTS & SIDE WELL EXPLORATION UPDATE

HIGHLIGHTS

  • All assays have now been received for the Phase 5 RC and AC programs at Mulga Bill

  • RC Highlights include:

  • 1m @ 97.97g/t Au from 117m in 21MBRC076

  • 25m @ 1.85g/t Au from 84m in 21MBRC065, including 1m @ 25.78g/t Au from 108m

  • 12m @ 3.23g/t Au from 93m in 21MBRC083

  • AC Highlights include:

  • 3m @ 6.69g/t Au from 45m in 21SWAC147

  • 8m @ 1.79g/t Au from 80m in 21SWAC149, including 4m @ 3.00g/t Au from 80m

  • Extensional AC drilling at the Ironbark Prospect, located 1.5km east of Mulga Bill, has now defined mineralisation over 500m of strike, open to the South

  • Follow up RC planned to test the fresh rock below significant AC intersections

  • Recent AC drilling at priority regional prospect Jones Well has intersected anomalous mineralisation on the first target, providing follow-up potential for gold mineralisation in the fresh rock - assays pending on 110 holes

  • Diamond drilling is progressing well, and the 3D IP survey is expected to be completed in the coming week

~~➢~~

Great Boulder Resources (“ Great Boulder ” or the “ Company ”) (ASX: GBR ) is pleased to advise all remaining assays have been received for the Phase 5 reverse circulation (RC) and Phase 5 air-core (AC) drilling programs completed in late 2021, at the Side Well Gold Project (“ Side Well ”) near Meekatharra in Western Australia. The Company has also received assays for the first 38 holes of a 148-hole AC program drilled earlier this year at Mulga Bill and Jones Well.

The RC results have continued to define high-grade mineralisation in the central area of Mulga Bill, with intersections of up to 1m @ 97.97g/t Au. Recent Phase 5 AC results have infilled the Loaded Dog area of Mulga Bill with intersections such as 3m @ 6.69g/t Au in 21SWAC147, and have also extended known mineralisation at the nearby Ironbark discovery to 500m.

Initial results have also been received from the recent 148-hole AC drill program completed in early March 2022. This program included 25 holes exploring further south on the Mulga Bill corridor, and 123 holes testing geochemical anomalies at Jones Well. Significantly, results from the first 19 holes at Jones Well have identified anomalous mineralisation on the first target, with results pending for 106 holes in that area and four follow-up holes at the southern end of Mulga Bill.

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 22 MARCH 2022

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Great Boulder’s Managing Director, Andrew Paterson commented:

“We’re very glad to have received results from the balance of last year’s programs. This removes a significant bottleneck in our exploration process, as the new lab are already sending results for holes sampled in February.”

“The balance of the RC assays at Mulga Bill have provided important information on mineralised orientations in the high-grade zones, and we are starting to see evidence of interacting sub-vertical and flat-dipping structures. This observation may be interpreted as an orogenic overprint on an earlier epithermal system which we inferred from the lithogeochemical studies with Dr Scott Halley.”

“Infill AC drilling in the Loaded Dog area of Mulga Bill returned some significant grades up to 3m @ 6.69g/t Au, which is very high for AC drilling in this environment. We recently drilled more AC holes around the high-grade hit in 21SWAC119, which ended with 1m @ 23.78g/t Au, and we will be aiming to continue to define that zone along strike.”

“I am also excited to see that Ironbark now has 500m of mineralised footprint, and we may also have made our first gold discovery up at Jones Well.”

“The Side Well project is progressing simultaneously on several fronts, which is fantastic to see. We’re making good progress towards our 100,000m drilling target this year which will be a major step towards our goal of reporting a mineral resource estimate on Mulga Bill. It’s really going to be a big year for Great Boulder.”

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FIGURE 1: SIDE WELL PROJECT AND PROSPECT LOCATIONS

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 22 MARCH 2022

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Highlights from the drilling include:

  • 1m @ 97.97g/t Au from 117m in 21MBRC076

  • 25m @ 1.85g/t Au from 84m in 21MBRC065, including 1m @ 25.78g/t Au from 108m

  • 12m @ 3.23g/t Au from 93m in 21MBRC083

  • 3m @ 6.69g/t Au from 45m in 21SWAC147

  • 8m @ 1.79g/t Au from 80m in 21SWAC149, including 4m @ 3.00g/t Au from 80m

  • 3m @ 1.21g/t Au from 51m in 21SWAC158 at Ironbark, including 1m @ 3.07g/t Au from 53m

  • 6m @ 0.38g/t Au from 60m to end of hole (EOH) in 22SWAC054 at Jones Well, including 2m @ 0.59g/t from 64m to EOH

  • 4m @ 0.66g/t Au from 40m in 21SWAC064 at Jones Well.

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FIGURE 2: RECENT RC AND AC RESULTS ON THE MULGA BILL TREND

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 22 MARCH 2022

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FIGURE 3: RECENT DRILLING HIGHLIGHTS FROM CENTRAL MULGA BILL. THE IMAGE BACKGROUND IS GRAVITY OVER MAGNETICS

Ironbark

The Ironbark prospect, located to the south-east of Mulga Bill, was discovered during 2021. Initially identified by auger sampling, first-pass AC drilling identified anomalous gold including 8m @ 2.39g/t Au in hole 21SWAC101, reported on 28 September 2021.

Results from AC drilling completed at Ironbark in October appear to have closed off mineralisation to the north, however the 500m-long north-northeast-trending mineralised zone remains open to the south and results such as 3m @ 1.21g/t Au in hole 21SWAC158 provide further encouragement. The next stage of exploration at Ironbark will include drilling a number of RC holes to test mineralisation in fresh rock below these AC hits.

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 22 MARCH 2022

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FIGURE 4: AC DRILL COVERAGE TO DATE AT IRONBARK. THE BACKGROUND IMAGE IS TOTAL MAGNETIC INTENSITY (TMI).

Jones Well

The Jones Well area encompasses the northern third of Side Well. There are several areas at Jones Well where cross-cutting structures and small igneous intrusions have disrupted the greenstone stratigraphy, providing ideal dilational conditions for gold mineralisation. While records exist for a small number of RAB holes drilled at Jones Well during the mid-1990’s the area remains largely unexplored.

A first-pass, broad-spaced soil sampling program and subsequent infill soil sampling during 2021 identified several discrete, low-tenor geochemical anomalies. A first-pass AC program was completed during February 2022 to test some of these anomalies. Assays for 19 of 123 AC holes drilled at Jones Well have already been received, which is a significant improvement on sample assay turnaround.

Significantly, these results include 6m @ 0.38g/t Au from 60m to end of hole (EOH) in 22SWAC054 including 2m @ 0.59g/t from 64m to EOH, and 4m @ 0.66g/t Au from 40m in 21SWAC064. These results are very positive in the context of AC drilling, and end-of-hole mineralisation is particularly encouraging as it implies potential for primary gold mineralisation in the fresh rock. Follow-up drilling will test whether these two results are located on a northeast-striking mineralised zone.

The remaining assays for the Jones Well program are expected to be received in the coming weeks.

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 22 MARCH 2022

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FIGURE 5: RECENT AC RESULTS AND HOLES PENDING ASSAY AT JONES WELL OVER
REGIONAL MAGNETICS
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Next Steps

Diamond drilling is progressing well at Mulga Bill, with the program expected to be completed towards the end of March. RC drilling is expected to recommence as soon as the diamond program is complete.

The 3D IP survey is expected to be completed in the coming week, with results and analysis anticipated as soon as the data has been processed. This survey is designed to define a 3- dimensional model of chargeable zones at Mulga Bill caused by sulphides in the rock mass. The 3D model will be used to plan additional drill targets testing gold mineralisation associated with these sulphide-rich zones, both at depth and along strike.

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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22 MARCH 2022

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FIGURE 6: LONG SECTION PROJECTION OF THE CENTRAL MULGA BILL AREA

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FIGURE 7: CROSS SECTION 7060340N SHOWING THE RECENT HIGH-GRADE INTERSECTION IN RELATION TO DOMINANT STRUCTURAL FEATURES

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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22 MARCH 2022

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FIGURE 8: CROSS SECTION 7060800 SHOWING THE POSITION OF A HIGH-GRADE QUARTZ VEIN WITHIN SUPERGENE MINERALISATION IN HOLE 21MBRC065

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FIGURE 9: HIGHLY ENCOURAGING INTERSECTIONS IN AC DRILLING AT LOADED DOG, WITHIN THE MULGA BILL TREND

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 22 MARCH 2022

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FIGURE 10: SIDE WELL LOCATION PLAN

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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Follow GBR on LinkedIn

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Media

Lucas Robinson Corporate Storytime +61 408 228 889 [email protected]

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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 22 MARCH 2022

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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 ranging from greenfields through to advanced exploration located in Western Australia. The Company’s core focus is advancing the Whiteheads and Side Well gold projects while progressing initial exploration at the earlier stage 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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FIGURE 11: GREAT BOULDER’S PROJECTS

COMPETENT PERSON’S STATEMENT

Exploration information in this Announcement 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.

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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TABLE 1: SIGNIFICANT INTERSECTIONS - MULGA BILL PHASE 5 RC DRILLING

Hole ID From To Width Grade Comments
(m) (m) (m) (g/t Au)
21MBRC063 84 87 3 2.84
And 93 96 3 1.18
And 99 101 2 2.43
And 115 118 3 1.53
21MBRC064 No significant intersection
21MBRC065 84 109 25 1.85 Includes 4m composites
Including 108 109 1 25.78
And 232 233 1 1.10
21MBRC066 113 116 3 1.68
21MBRC067 64 80 16 0.21 4m composites
And 115 128 13 0.55
21MBRC068 No significant intersection
21MBRC069 80 84 4 0.16 4m composite
And 172 175 3 0.71
21MBRC070 84 88 4 0.16 4m composite
And 140 146 6 0.79
21MBRC071 91 92 1 0.81
And 138 139 1 0.53
And 158 159 1 5.79
And 189 190 1 1.80
21MBRC072 90 91 1 1.22
And 93 94 1 0.81
And 152 153 1 0.69
21MBRC073 81 83 2 1.07
Including 82 83 1 1.24
183 185 2 1.93
21MBRC074 31 33 2 1.83
And 36 37 1 0.80
And 47 48 1 2.40
And 72 76 4 1.02 4m composite
And 84 85 1 2.27
21MBRC075 91 92 1 6.71
21MBRC076 16 20 4 0.17 4m composite
And 24 32 8 0.22 4m composites
And 103 104 1 3.19
And 117 118 1 97.97
21MBRC077 84 92 8 0.40 4m composites
21MBRC078 80 84 4 1.35 4m composite
21MBRC079 21 24 3 0.21 3m composite
And 92 96 4 0.87 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

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Hole ID From To Width Grade Comments
(m) (m) (m) (g/t Au)
And 114 115 1 1.59
21MBRC080 80 84 4 0.17 4m composite
21MBRC081 64 68 4 0.21 4m composite
And 72 80 8 0.33 4m composites
And 132 136 4 0.13 4m composite
And 210 211 1 0.65
21MBRC082 76 84 8 0.85 4m composites
And 96 100 4 0.20 4m composite
21MBRC083 93 105 12 3.23 4m composites
Including 93 103 10 3.77 Includes composites
21MBRC084 58 60 2 1.02 2m composite
And 68 72 4 0.35 4m composite
And 80 88 8 2.14 4m composites
And 127 128 1 0.96
21MBRC085 68 72 4 0.36 4m composite
And 130 136 6 0.20 4m, 2m composites
21MBRC086 84 92 8 0.44 4m composites
And 104 108 4 1.22 3m composite
And 112 120 8 1.12 4m composites
Including 112 116 4 2.02 4m composite
21MBRC087 52 56 4 0.11 4m composite
And 90 91 1 5.84
And 104 112 8 0.20 4m composites
21MBRC088 48 49 1 0.65
And 50 51 1 0.51
And 100 108 8 0.32 4m composites
And 142 146 4 0.11 4m composite
21MBRC089 92 96 4 0.13 4m composite
And 156 160 4 0.17 4m composite
21MBRC090 No significant intersection
21MBRC091 64 68 4 0.27 4m composite
And 133 140 7 2.56
Including 135 139 4 3.97
And 168 170 2 3.26
And 223 225 2 1.64
And 269 270 1 1.31
21MBRC092 36 40 4 0.24 4m composite
And 48 49 1 1.17
And 174 176 2 0.59 2m composite
And 186 191 5 0.94
including 186 187 1 1.70

*Significant RC intersections calculated on a 0.5g/t Au cut-off grade with a maximum 2m of internal dilution.

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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TABLE 2: SIGNIFICANT INTERSECTIONS: MULGA BILL CORRIDOR AND REGIONAL PHASE 5 AC DRILLING

Prospect Hole ID From To Width Grade Comments
(m) (m) (m) (g/t Au)
Mulga Bill 21SWAC135 No significant intersection
Mulga Bill 21SWAC136 63 65 2 0.18 To EOH
Mulga Bill 21SWAC137 No significant intersection
Mulga Bill 21SWAC138 48 60 12 0.12
And 64 66 2 0.22
Mulga Bill 21SWAC139 36 40 4 0.18
And 60 64 4 0.10
Mulga Bill 21SWAC140 No significant intersection
Mulga Bill 21SWAC141 40 52 12 0.28
84 88 4 0.26
Mulga Bill 21SWAC142 88 102 14 0.28
Mulga Bill 21SWAC143 92 96 4 0.23
Mulga Bill 21SWAC144 52 56 4 0.35
And 72 77 5 0.36 To EOH
including 76 77 1 1.32 To EOH
Mulga Bill 21SWAC145 78 80 2 0.16 To EOH
Mulga Bill 21SWAC146 No significant intersection
Mulga Bill 21SWAC147 20 32 12 0.20
And 45 48 3 6.69
And 50 54 4 0.26
And 62 66 4 0.20 To EOH
Mulga Bill 21SWAC148 52 56 4 0.13
Mulga Bill 21SWAC149 80 88 8 1.79
including 80 84 4 3.00
Mulga Bill 21SWAC150 No significant intersection
Mulga Bill 21SWAC151 32 36 4 0.34
And 39 52 13 0.70
Mulga Bill 21SWAC152 49 50 1 0.27
Mulga Bill 21SWAC153 64 68 4 0.94
Mulga Bill 21SWAC154 51 52 1 0.16
Mulga Bill 21SWAC155 84 88 4 1.19
And 104 108 4 0.55 To EOH
Ironbark 21SWAC156 No significant intersection
Ironbark 21SWAC157 16 20 4 0.15
And 30 31 1 0.15
Ironbark 21SWAC158 24 28 4 0.58
And 36 44 8 0.40
And 51 54 3 1.21
including 53 54 1 3.07
And 60 61 1 0.60

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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Ironbark 21SWAC159 No significant intersection
Ironbark 21SWAC160 No significant intersection
Ironbark 21SWAC161 No significant intersection
Ironbark 21SWAC162 No significant intersection
Ironbark 21SWAC163 No significant intersection
Ironbark 21SWAC164 No significant intersection
Ironbark 21SWAC165 32
44
12 0.17
And 52
60
8 0.18
Ironbark 21SWAC166 No significant intersection
Ironbark 21SWAC167 No significant intersection
Ironbark 21SWAC168 No significant intersection
Ironbark 21SWAC169 No significant intersection
Ironbark 21SWAC170 No significant intersection
Ironbark 21SWAC171 No significant intersection
Ironbark 21SWAC172 No significant intersection
Ironbark 21SWAC173 No significant intersection
Ironbark 21SWAC174 No significant intersection
Ironbark 21SWAC175 No significant intersection
Ironbark 21SWAC176 No significant intersection
Ironbark 21SWAC177 No significant intersection
Ironbark 21SWAC178 No significant intersection
Ironbark 21SWAC179 No significant intersection
Ironbark 21SWAC180 No significant intersection
Ironbark 21SWAC181 No significant intersection

*Significant AC intersections calculated on a 0.1g/t Au cut-off grade with a maximum 4m of internal dilution.

Please note that collar details for the Phase 5 RC program were included in GBR’s ASX announcement of 31 January 2022.

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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TABLE 3: SIGNIFICANT INTERSECTIONS – JONES WELL AC DRILLING

Prospect Hole ID From
To
Width
Grade
Comments
(m)
(m)
(m)
g/t Au
Mulga Bill 22SWAC001 No significant intersection
Mulga Bill 22SWAC002 No significant intersection
Mulga Bill 22SWAC003 No significant intersection
Mulga Bill 22SWAC004 114
115
1
0.13
Mulga Bill 22SWAC005 No significant intersection
Mulga Bill 22SWAC006 No significant intersection
Mulga Bill 22SWAC007 104
108
4
0.11
4m composite
Mulga Bill 22SWAC008 No significant intersection
Mulga Bill 22SWAC009 No significant intersection
Mulga Bill 22SWAC010 No significant intersection
Mulga Bill 22SWAC011 No significant intersection
Mulga Bill 22SWAC012 No significant intersection
Mulga Bill 22SWAC013 No significant intersection
Mulga Bill 22SWAC014 No significant intersection
Mulga Bill 22SWAC015 No significant intersection
Mulga Bill 22SWAC016 No significant intersection
Mulga Bill 22SWAC017 No significant intersection
Mulga Bill 22SWAC018 No significant intersection
Mulga Bill 22SWAC019 No significant intersection
Mulga Bill 22SWAC020 96
100
4
0.11
4m composite
Mulga Bill 22SWAC021 No significant intersection
Jones Well 22SWAC054 8
12
4
0.14
4m composite
Jones Well And 60
66
6
0.38
Composites. To EOH.
Jones Well Including 64
66
2
0.59
To EOH
Jones Well 22SWAC055 No significant intersection
Jones Well 22SWAC056 53
54
1
0.11
Jones Well 22SWAC057 No significant intersection
Jones Well 22SWAC058 41
42
1
0.25
To EOH
Jones Well 22SWAC059 No significant intersection
Jones Well 22SWAC061 No significant intersection
Jones Well 22SWAC062 No significant intersection
Jones Well 22SWAC063 No significant intersection
Jones Well 22SWAC064 40
44
4
0.66
4m composite
Jones Well 22SWAC065 No significant intersection
Jones Well 22SWAC066 No significant intersection
Jones Well 22SWAC067 No significant intersection
Jones Well 22SWAC068 No significant intersection
Jones Well 22SWAC069 No significant intersection
Jones Well 22SWAC070 No significant intersection
Jones Well 22SWAC071 No significant intersection
*Significant AC intersections calculated on a 0.1g/t Au cut-off grade with a maximum 4m of internal dilution.

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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TABLE 4: COLLAR DETAILS – MULGA BILL PHASE 5 AC. COORDINATES ARE IN GDA94 ZONE 50

Hole ID Easting Northing RL Depth Dip
Azimuth
21SWAC135 658585 7058598 514 81 -60
270
21SWAC136 658634 7058601 514 65 -60
270
21SWAC137 658685 7058602 514 104 -60
270
21SWAC138 658483 7058645 513 150 -60
270
21SWAC139 658534 7058647 513 84 -60
270
21SWAC140 658583 7058645 514 100 -60
270
21SWAC141 658635 7058644 514 102 -60
270
21SWAC142 658684 7058648 514 114 -60
270
21SWAC143 658484 7058745 513 119 -60
270
21SWAC144 658585 7058749 514 77 -60
270
21SWAC145 658685 7058744 514 80 -60
270
21SWAC146 658487 7058845 513 85 -60
270
21SWAC147 658532 7058843 513 66 -60
270
21SWAC148 658583 7058845 514 91 -60
270
21SWAC149 658639 7058850 514 90 -60
270
21SWAC150 658682 7058848 514 93 -60
270
21SWAC151 658486 7058942 513 69 -60
270
21SWAC152 658537 7058942 513 62 -60
270
21SWAC153 658584 7058941 513 94 -60
270
21SWAC154 658633 7058944 514 89 -60
270
21SWAC155 658686 7058946 514 108 -60
270
21SWAC156 660162 7058897 518 48 -60
90
21SWAC157 660123 7058898 518 60 -60
90
21SWAC158 660085 7058897 518 63 -60
90
21SWAC159 660043 7058898 517 35 -60
90
21SWAC160 660004 7058906 517 20 -60
90
21SWAC161 660207 7058723 518 59 -60
90
21SWAC162 660165 7058719 518 25 -60
90
21SWAC163 660124 7058713 517 60 -60
90
21SWAC164 660083 7058712 517 71 -60
90
21SWAC165 660043 7058711 517 75 -60
90
21SWAC166 660005 7058710 517 62 -60
90
21SWAC167 659967 7058718 517 21 -60
90
21SWAC168 660238 7059298 519 62 -60
90
21SWAC169 660203 7059296 519 20 -60
90
21SWAC170 660162 7059297 518 27 -60
90
21SWAC171 660122 7059298 518 57 -60
90
21SWAC172 660083 7059299 518 49 -60
90
21SWAC173 660043 7059298 517 27 -60
90
21SWAC174 660323 7059503 520 30 -60
90
21SWAC175 660280 7059502 519 35 -60
90

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 22 MARCH 2022

17

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Hole ID Easting Northing RL Depth Dip
Azimuth
21SWAC176 660241 7059502 519 31 -60
90
21SWAC177 660203 7059501 519 23 -60
90
21SWAC178 660164 7059501 518 33 -60
90
21SWAC179 660122 7059501 518 52 -60
90
21SWAC180 660083 7059500 518 49 -60
90
21SWAC181 660045 7059502 517 45 -60
90

TABLE 5: COLLAR DETAILS – JONES WELL AC. COORDINATES ARE IN GDA94 ZONE 50

Hole ID Easting Northing RL Depth Dip
Azimuth
Prospect
22SWAC001 657732 7056441 513 113 -60
270
Mulga Bill
22SWAC002 657834 7056440 514 128 -60
270
Mulga Bill
22SWAC003 657935 7056441 515 132 -60
270
Mulga Bill
22SWAC004 658032 7056438 518 141 -60
270
Mulga Bill
22SWAC005 658134 7056439 516 141 -60
270
Mulga Bill
22SWAC006 658234 7056441 517 131 -60
270
Mulga Bill
22SWAC007 658335 7056440 521 150 -60
270
Mulga Bill
22SWAC008 658431 7056439 520 150 -60
270
Mulga Bill
22SWAC009 658536 7056437 518 82 -60
270
Mulga Bill
22SWAC010 658637 7056440 523 138 -60
270
Mulga Bill
22SWAC011 658734 7056440 521 143 -60
270
Mulga Bill
22SWAC012 658829 7056440 518 141 -60
270
Mulga Bill
22SWAC013 658934 7056439 517 131 -60
270
Mulga Bill
22SWAC014 659036 7056444 518 116 -60
270
Mulga Bill
22SWAC015 659134 7056440 519 38 -60
270
Mulga Bill
22SWAC016 659237 7056441 517 89 -60
270
Mulga Bill
22SWAC017 659333 7056442 517 55 -60
270
Mulga Bill
22SWAC018 657739 7055060 515 132 -60
270
Mulga Bill
22SWAC019 657836 7055062 516 141 -60
270
Mulga Bill
22SWAC020 657936 7055062 514 121 -60
270
Mulga Bill
22SWAC021 658036 7055060 514 90 -60
270
Mulga Bill
22SWAC022 658138 7055059 514 93 -60
090
Jones Well
22SWAC023 658238 7055062 514 72 -60
090
Jones Well
22SWAC024 658337 7055063 521 97 -60
090
Jones Well
22SWAC025 658440 7055058 522 98 -60
090
Jones Well
22SWAC026 658532 7055060 520 76 -60
090
Jones Well
22SWAC027 658635 7055059 519 104 -60
090
Jones Well
22SWAC028 658735 7055056 523 94 -60
090
Jones Well
22SWAC029 658832 7055063 514 94 -60
090
Jones Well
22SWAC030 658936 7055059 517 104 -60
090
Jones Well
22SWAC031 659034 7055045 519 89 -60
090
Jones Well
22SWAC032 659136 7055063 519 124 -60
090
Jones Well

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 22 MARCH 2022

18

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Hole ID Easting Northing RL Depth Dip
Azimuth
Prospect
22SWAC034 659335 7055066 524 81 -60
090
Jones Well
22SWAC035 660796 7069925 532 47 -60
090
Jones Well
22SWAC036 660748 7069922 519 64 -60
090
Jones Well
22SWAC037 660700 7069920 520 46 -60
090
Jones Well
22SWAC038 660648 7069923 520 66 -60
090
Jones Well
22SWAC039 660599 7069920 514 40 -60
090
Jones Well
22SWAC040 660550 7069921 512 44 -60
090
Jones Well
22SWAC041 660503 7069920 519 69 -60
090
Jones Well
22SWAC042 660452 7069921 514 61 -60
090
Jones Well
22SWAC043 660401 7069919 514 75 -60
090
Jones Well
22SWAC044 660351 7069920 512 64 -60
090
Jones Well
22SWAC045 660299 7069921 514 75 -60
090
Jones Well
22SWAC046 660249 7069920 515 54 -60
090
Jones Well
22SWAC047 660202 7069919 516 37 -60
090
Jones Well
22SWAC048 660799 7070122 517 51 -60
090
Jones Well
22SWAC049 660753 7070121 517 48 -60
090
Jones Well
22SWAC050 660699 7070122 512 42 -60
090
Jones Well
22SWAC051 660651 7070124 514 64 -60
090
Jones Well
22SWAC052 660602 7070122 517 72 -60
090
Jones Well
22SWAC053 660550 7070122 510 54 -60
090
Jones Well
22SWAC054 660500 7070121 513 66 -60
090
Jones Well
22SWAC055 660449 7070122 512 58 -60
090
Jones Well
22SWAC056 660399 7070121 511 56 -60
090
Jones Well
22SWAC057 660350 7070121 512 49 -60
090
Jones Well
22SWAC058 660301 7070122 507 42 -60
090
Jones Well
22SWAC059 660253 7070122 512 60 -60
090
Jones Well
22SWAC061 660753 7070329 514 105 -60
090
Jones Well
22SWAC062 660699 7070322 512 103 -60
090
Jones Well
22SWAC063 660650 7070323 513 70 -60
090
Jones Well
22SWAC064 660599 7070324 512 55 -60
090
Jones Well
22SWAC065 660548 7070322 513 63 -60
090
Jones Well
22SWAC066 660502 7070322 517 60 -60
090
Jones Well
22SWAC067 660450 7070323 512 59 -60
090
Jones Well
22SWAC068 660403 7070324 515 54 -60
090
Jones Well
22SWAC069 660649 7070524 514 72 -60
090
Jones Well
22SWAC070 660605 7070524 513 75 -60
090
Jones Well
22SWAC071 660551 7070519 513 66 -60
090
Jones Well
22SWAC072 660502 7070520 512 66 -60
090
Jones Well
22SWAC073 660453 7070522 510 80 -60
090
Jones Well
22SWAC074 660651 7070722 514 46 -60
090
Jones Well
22SWAC075 660599 7070720 512 62 -60
090
Jones Well
22SWAC076 660551 7070724 511 67 -60
090
Jones Well

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 22 MARCH 2022

19

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Hole ID Easting Northing RL Depth Dip
Azimuth
Prospect
22SWAC077 660501 7070722 511 89 -60
090
Jones Well
22SWAC078 660452 7070721 512 74 -60
090
Jones Well
22SWAC079 660401 7070722 513 67 -60
090
Jones Well
22SWAC080 660349 7070720 513 57 -60
090
Jones Well
22SWAC081 660603 7070921 513 56 -60
090
Jones Well
22SWAC082 660549 7070921 512 54 -60
090
Jones Well
22SWAC083 660498 7070922 509 60 -60
090
Jones Well
22SWAC084 660447 7070921 508 69 -60
090
Jones Well
22SWAC085 660398 7070920 513 72 -60
090
Jones Well
22SWAC086 660351 7070922 514 78 -60
090
Jones Well
22SWAC087 660310 7070924 514 96 -60
090
Jones Well
22SWAC088 660256 7070927 512 61 -60
090
Jones Well
22SWAC089 660398 7071120 513 78 -60
090
Jones Well
22SWAC090 660351 7071120 518 81 -60
090
Jones Well
22SWAC091 660300 7071122 514 81 -60
090
Jones Well
22SWAC092 660251 7071121 508 90 -60
090
Jones Well
22SWAC093 660196 7071129 516 72 -60
090
Jones Well
22SWAC094 664204 7072926 526 34 -60
090
Jones Well
22SWAC095 664149 7072925 529 36 -60
090
Jones Well
22SWAC096 664104 7072925 526 39 -60
090
Jones Well
22SWAC097 664058 7072929 528 36 -60
090
Jones Well
22SWAC098 664002 7072923 529 42 -60
090
Jones Well
22SWAC099 663952 7072923 524 37 -60
090
Jones Well
22SWAC100 663903 7072924 524 44 -60
090
Jones Well
22SWAC101 663848 7072920 522 65 -60
090
Jones Well
22SWAC102 663801 7072924 523 43 -60
090
Jones Well
22SWAC103 663750 7072924 522 51 -60
090
Jones Well
22SWAC104 664201 7072722 519 12 -60
090
Jones Well
22SWAC105 664153 7072727 522 24 -60
090
Jones Well
22SWAC106 664099 7072724 523 26 -60
090
Jones Well
22SWAC107 664054 7072728 523 28 -60
090
Jones Well
22SWAC108 663951 7072725 523 36 -60
090
Jones Well
22SWAC109 663902 7072729 522 56 -60
090
Jones Well
22SWAC110 663851 7072724 523 51 -60
090
Jones Well
22SWAC111 663804 7072723 525 55 -60
090
Jones Well
22SWAC112 663750 7072723 523 60 -60
090
Jones Well
22SWAC113 664449 7071925 524 39 -60
090
Jones Well
22SWAC114 664408 7071928 523 41 -60
090
Jones Well
22SWAC115 664350 7071922 520 51 -60
090
Jones Well
22SWAC116 664304 7071919 522 51 -60
090
Jones Well
22SWAC117 664251 7071918 527 49 -60
090
Jones Well
22SWAC118 664207 7071923 521 45 -60
090
Jones Well

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 22 MARCH 2022

20

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Hole ID Easting Northing RL Depth Dip
Azimuth
Prospect
22SWAC119 664152 7071919 521 42 -60
090
Jones Well
22SWAC120 664100 7071927 521 40 -60
090
Jones Well
22SWAC121 664056 7071931 524 24 -60
090
Jones Well
22SWAC122 664448 7072125 523 53 -60
090
Jones Well
22SWAC123 664402 7072140 523 47 -60
090
Jones Well
22SWAC124 664354 7072125 522 30 -60
090
Jones Well
22SWAC125 664302 7072124 521 12 -60
090
Jones Well
22SWAC126 664261 7072124 518 15 -60
090
Jones Well
22SWAC127 664207 7072126 520 9 -60
090
Jones Well
22SWAC128 664152 7072127 516 9 -60
090
Jones Well
22SWAC129 664098 7072123 519 3 -60
090
Jones Well
22SWAC130 664052 7072125 522 2 -60
090
Jones Well
22SWAC131 664016 7072742 524 33 -60
090
Jones Well
22SWAC132 662652 7070922 517 57 -60
090
Jones Well
22SWAC133 662597 7070918 522 44 -60
090
Jones Well
22SWAC135 662499 7070921 518 58 -60
090
Jones Well
22SWAC136 662453 7070921 519 58 -60
090
Jones Well
22SWAC137 662404 7070929 519 63 -60
090
Jones Well
22SWAC138 662355 7070923 513 82 -60
090
Jones Well
22SWAC139 662305 7070916 513 78 -60
090
Jones Well
22SWAC140 662654 7070721 517 73 -60
090
Jones Well
22SWAC141 662600 7070727 517 72 -60
090
Jones Well
22SWAC142 662553 7070725 517 50 -60
090
Jones Well
22SWAC143 662499 7070723 517 66 -60
090
Jones Well
22SWAC144 662450 7070723 519 42 -60
090
Jones Well
22SWAC145 662403 7070722 518 50 -60
090
Jones Well
22SWAC146 662342 7070724 525 46 -60
090
Jones Well
22SWAC147 662310 7070723 520 53 -60
090
Jones Well
22SWAC148 658285 7056950 521 114 -60
270
Mulga Bill
22SWAC149 658237 7056950 515 151 -60
270
Mulga Bill
22SWAC150 658293 7057053 515 138 -60
270
Mulga Bill
22SWAC151 658269 7056702 514 140 -60
270
Mulga Bill

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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APPENDIX 1 - JORC CODE, 2012 EDITION TABLE 1

Section 1 Sampling Techniques and Data

(Criteria in this section apply to all succeeding sections.)

Criteria Commentary
Sampling techniques RC samples were 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 were sampled over 1m intervals and sent for analysis while the
rest of the hole was composited over 4m intervals by taking a spear sample from each 1m bag.
Drilling techniques RC Drilling was undertaken by Challenge Drilling. AC drilling was undertaken by Prospect Drilling.
Industry standard drilling methods and equipment were used.
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. Significant
ground water was encountered in drilling which resulted in numerous wet samples.
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 were taken in the field. Samples from the
2021 drilling program were prepared and analysed at Genalysis Assay Laboratories Perth, while
those drilled during 2022 were analysed by ALS in Perth. Samples were pulverized so that each
samples had a nominal 85% passing 75 microns. Au analysis was undertaken using FA50/OE
involving 50g lead collection fire assay and Inductively Coupled Plasma Optical Emission
Spectrometry (ICP-OES) finish.
Quality of assay data
and laboratory tests
All samples were assayed by industry standard techniques.
Verification of sampling
and assaying
The standard GBR protocol was followed for insertion of standards and blanks with a blank and
standard inserted per 40 samples. No QAQC problems were identified in the results. No twinned
drilling has been undertaken.
The gravity data was checked and verified independently by a consulting geophysicist.
Data spacing and
distribution
The spacing and location of the majority of drilling in the projects is, by the nature of early
exploration, variable.
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.
True width and orientation of intersected mineralisation is currently unknown or not clear.
The spacing and location of the data is currently only being considered for exploration purposes.
Sample security GBR personnel were responsible for delivery of samples from the drill site to the courier companies
dispatch center in Meekatharra. Samples were transported by Toll Intermodal from Meekatharra to
the laboratory in Perth.
Audits or reviews Data review and interpretation by independent consultants.

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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Section 2 Reporting of Exploration Results

(Criteria listed in the preceding section also apply to this section.)

Criteria Commentary
Mineral tenement and Side Well tenement E51/1905 is a 48-block exploration license covering an area of 131.8km2
land tenure status immediately east and northeast of Meekatharra in the Murchison province. The tenement is a 75:25
joint venture between Great Boulder and Zebina Minerals PtyLtd.
Exploration done by Tenement E51/1905 has a protracted exploration history but is relatively unexplored compared to
other parties other regions surrounding Meekathara.
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.
Drill hole Information A list of the drill hole coordinates, orientations and intersections reported in this announcement are
provided as an appended table.
Data aggregation Results were reported using cut-off levels relevant to the sample type. For composited samples
methods significant intercepts were reported for grades greater than 0.1g/t Au with a maximum dilution of
4m. For single metre splits, significant intercepts were reported for grades greater than 0.8g/t Au
with a maximum dilution of 2m.
A weighted average calculation was used to allow for bottom of hole composites that were less than
the standard 4m and when intervals contain composited samples plus 1m split samples.
No metal equivalents are used.
Relationship between The orientation of structures and mineralisation is not known with certainty, but majority of the
mineralisation widths drilling drilling was conducted using appropriate perpendicular orientations for interpreted
and intercept lengths mineralisation. Diamond drilling has confirmed a mineralised intrusive body at Side Well has a near
vertical dip and trends broadly north-south. Due to the wide spacing of drill lines exact orientation is
not clear.
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 been re-reported by GBR to highlight the prospectivity of the region. Full
drillhole details can be found in publicly available historical annual reports.
Other substantive Subsequent to Doray Minerals Limited exiting the project in 2015, private companies have held the
exploration data ground with no significant work being undertaken.
Further work Further work is discussed in the document.

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