GREAT DIVIDE MINING LTD — Capital/Financing Update 2025

Dec 3, 2025

ASX Release

4 December 2025

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Further Antimony Observed in Coonambula Drilling

Highlights

Great Divide Mining Limited (ASX: GDM) (“GDM” or “the Company”) is pleased to note the announcement by its Farm-In Joint Venture partner, Dart Mining NL (ASX: DTM), reporting excellent progress in its initial drilling phase at the Banshee Antimony-Gold Prospect, including highlighting visually mineralised intercepts in diamond drilling results from the Coonambula Antimony-Gold Project in Central Queensland.

These visual intercepts of antimony mineralisation from the historic Banshee Mine area demonstrate the project’s scale and potential.

Dart Mining is continuing its initial drilling program at Coonambula using its in-house rig, designed to infill existing high-grade intersections and advance toward a JORC-compliant Antimony-Gold Resource. Further drilling results are expected in the coming months.

GDM Managing Director Justin Haines said the results validated the Company’s exploration model and timing of the Dart Mining farm-in:

“The continuing great results from Dart’s drilling at Coonambula continues to demonstrate the potential for a high-value antimony-gold system at the historic Banshee Mine and further strengthen the case for accelerated drilling across the Banshee trend.”

For full sampling and assay details and Competent Persons Statement, please refer to Dart Mining’s ASX announcement dated 4 December 2025 titled “More Massive Antimony (Stibnite) Intersected at Coonambula with DTM Drilling” appended to this announcement.

About the DTM – GDM Joint Venture

Under the Joint Venture Agreement with GDM, Dart Mining may earn up to a 51 % interest in the Coonambula Project, across its’ six tenements, by completing defined drilling and reporting milestones over a two-year period. Dart has acquired an initial 15 % interest having paid an amount of $250,000 to GDM and now has obligations to complete at least 4,000 m of drilling and deliver two geological/resource reports to reach the 51 % ownership.

Dart has been appointed Manager of the JV during the earn-in, whilst GDM retains the tenement ownership and a carried interest through the early exploration phases.

Coonambula is located approximately 70 km southeast of Evolution Mining’s Cracow gold mine and 25 km southwest of Eidsvold. The Project is currently held 100 % by GDM subsidiaries GDM Coonambula Pty Ltd and GDM Yellow Jack Pty Ltd.

Great Divide Mining Ltd ACN 655 868 803 GPO Box 154 Brisbane QLD 4001 greatdividemining.com.au

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Figure 1 Location plan showing planned hole locations and preliminary interpretation of mineralisation.

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Figure 2 0.3m of quartz hosted massive stibnite* in hole CBADD007 from 139m.

*Visual estimates of mineral abundance should never be considered a proxy or substitute for laboratory analyses where concentrations or grades are the factor of principal economic interest. Visual estimates also potentially provide no information regarding impurities or deleterious physical properties relevant to valuations.

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ASX release authorised by the Board of Great Divide Mining Ltd.

For further information:

Justin Haines

Chief Executive Officer e: justin.haines@greatdividemining.com.au

About Great Divide Mining Ltd (ASX: GDM)

Great Divide Mining is a Gold, Antimony and critical metals miner, explorer and developer with five projects across 17 tenements (including two in application). GDM’s focus is on operating producing assets within areas of historical mining and past exploration with nearby infrastructure, thus enabling rapid development. Through a staged exploration and development programme, GDM intends to generate cash flow from its initial projects to support further exploration across its portfolio of highly prospective tenements.

Forward-Looking Statements

This announcement may contain forward-looking information about the Company and its operations. In certain cases, forward-looking information may be identified by such terms as "anticipates", "believes", “should”, "could", "estimates", “target”, “likely”, “plan”, "expects", "may", “intend”, "shall", "will", or "would". These statements are based on information currently available to the Company and the Company provides no assurance that actual results will meet management's expectations. Forward-looking statements are subject to risk factors associated with the Company’s business, many of which are beyond the control of the Company. It is believed that the expectations reflected in these statements are reasonable, but they may be affected by a variety of variables and changes in underlying assumptions which could cause actual results or trends to differ materially from those expressed or implied in such statements. There can be no assurance that actual outcomes will not differ materially from these statements.

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ASX Release

4[th] December 2025

More Massive Antimony (Stibnite) Intersected at Coonambula with DTM drilling

Dart Mining NL ( ASX:DTM ) ( Dart Mining or the Company ) is pleased to update the market on continued visual mineralisation in diamond drill core at the Coonambula Antimony-Gold Project located in Central Queensland. This announcement continues from previous and summarises visual mineralisation in drill holes CBADD004 through CBADD010 . Core loss in CBADD005 triggered a redrill at the site resulting in CBADD005a. This announcement covers visual observations of mineralisation from these 8 drill holes. All Dart Mining diamond drill holes to date have intersected visual stibnite.

HIGHLIGHTS

• Dart Mining has completed a total of 1,354m of diamond drilling across the Banshee Prospect. All holes have intersected visual stibnite (and most have massive stibnite);

• Drill hole CBADD010 intersected 0.5m of solid Stibnite mineralisation from 37.9m . This intersection is part of a larger 2.2m interval from 36.2m depth containing stibnite and quartz veining surrounding a fault zone (Figure 1);

• Hole CBADD006 intersected a 1.1m quartz veined zone from 8.7m (Figure 5). This interval contained two 0.1m solid stibnite veins from 8.7m and 9.6m ;

• CBADD004 has a 7.4m wide sulphide mineralised zone from 59.5 to 66.9m including 0.15m of massive stibnite (60%) from 59.5m and 0.45m with an estimated 15% stibnite from 64.15m.;

• CBADD005 and CBADD005a have massive stibnite zones and CBADD005a had a 2.5m stibnite bearing fault gouge zone from 73.0m;

• CBADD007 has a 0.3m massive stibnite zone from 139.0m (photo shown as Figure 6);

• Visual results confirm the fertility of the Banshee Prospect across a 300m strike which is the extent of DTM exploration to date. DTM considers the strike open for further exploration

Dart Mining’s Chairman, James Chirnside, commented :

“Dart Mining continues to make excellent progress at the Coonambula project, diamond drilling over 1,300 metres. From interesting host rock geology though to hydrothermal breccias and of course massive stibnite zones the project continues to positively surprise. At this stage we are continuing to

Contact: James Chirnside Webpage: www.dartmining.com.au Email: jchirnside@dartmining.com.au LinkedIn: Dart Mining NL Mobile: +61 447 447 613 Twitter: @DartMining

Dart Mining NL ABN: 84 119 904 880 Level 6, 412 Collins Street Melbourne VIC 3000

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hit Stibnite (Sb) over a 300m strike, which remains open along strike and at depth. It appears that the gold dominated strike extensions should also be targeted for further Sb mineralisation.

We’ve now fully established the core processing facility which includes an auto feed core saw. Field teams are working to get the current core logged, cut, sampled, and off to the lab. We’re looking forward to seeing more strong Sb numbers, and equally importantly, the broader gold zones we’ve observed in CBADD001 which we expect to surround these stibnite zones.”

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Figure 1 : DTM driller and 1.6m of the 2.2m section of CBADD010 where massive stibnite and quartz veining with stibnite was intersected. A small (20cm) fault zone is also present in this interval. *

*Visual estimates of mineral abundance should never be considered a proxy or substitute for laboratory analyses where concentrations or grades are the factor of principal economic interest. Visual estimates also potentially provide no information regarding impurities or deleterious physical properties relevant to valuations.

Figure 2 is a long section interpretation of the Banshee Prospect to date which include Dart Mining’s and historical drilling. Figure 2 highlights the confirmed Sb zone (by Dart Mining) and we will be looking to expand that Sb zone into the broader gold zone along strike. Plan mapping showing the current drilling by Dart Mining to date is shown in Figure 3.

Figure 4 is a cross section of the CBADD010 intersection showing the 2.2m Stibnite zone which sits inside a broader 9.4m zone of strong sericite alteration (including veining). CBADD010 is the closest drillhole to the historical Banshee workings and the interpretation is that the zone is coalescing the multiple zones observed further west.

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Figure 2 : Long section through the Banshee Prospect (Coonambula) highlighting Dart’s current interpretation of the Sb and Au zones. Long section also highlights that Dart’s drilling has hit stibnite across its full strike and will continue to step out.

Dart Mining NL Contact: James Chirnside Webpage: www.dartmining.com.au ABN: 84 119 904 880 Email: jchirnside@dartmining.com.au LinkedIn: Dart Mining NL Level 6, 412 Collins Street Mobile: +61 447 447 613 Twitter: @DartMining Melbourne VIC 3000

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Figure 3 : Location plan showing planned hole locations and preliminary interpretation of mineralisation.

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Figure 4 : Cross section of CBADD010 showing logged zones of massive sulphides*

*Visual estimates of mineral abundance should never be considered a proxy or substitute for laboratory analyses where concentrations or grades are the factor of principal economic interest. Visual estimates also potentially provide no information regarding impurities or deleterious physical properties relevant to valuations.

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Dart Mining will continue initial drilling to infill existing high-grade Sb-Au drill intersections at the historical Banshee Mine with the intent of working towards a JORC-compliant resource at the earliest opportunity (subject to successful infill drill results). Drilling activities are utilising Dart Mining’s inhouse drilling rig.

Drilling, interpretation and logging is ongoing, with early assessment of geology allowing quick adjustments to the drilling plan based on any changes in interpretation that may become apparent. The initial interpretation of CBADD008 is that the drillhole has overstepped the interval and should step back for a deeper intersection. Despite this, drilling completed to date has been encouraging, with mineralisation (of varying style and intensity) visually intersected in all completed drillholes. Drilling to date has been supporting the current exploration rationale for the Coonambula project and proving the exceptional deposit potential for the Banshee prospect. Dart Mining’s drilling is currently targeting deeper zones while we establish continuity and thickness. CBADD006 was drilled very shallow to highlight and understand Sb mineralisation near surface. The stibnite and quartz are intact and show limited weathering while the surrounding host (granodiorite and likely phyllic alteration zone) is moderately weathered (Figure 5).

Additional massive stibnite observations relative to faulting have been intersected. The Company interpreted hydrothermal breccias at the base of CBADD002, but have also intersected faulting related mineralisation in CBADD007 (Figure 6) and CBADD010.

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Figure 5 : Section of quartz veining hosting stibnite in hole CBADD006. Interval indicated is from 8.7 to 9.8m and contains massive stibnite from 8.7 to 8.8m, and 9.6 to 9.7m.

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Figure 6: 0.3m of quartz hosted massive stibnite in hole CBADD007 from 139m. Fault gouge seen on the left of hand specimen, indicating the fault controlled nature of mineralisation at Coonambula.

*Visual estimates of mineral abundance should never be considered a proxy or substitute for laboratory analyses where concentrations or grades are the factor of principal economic interest. Visual estimates also potentially provide no information regarding impurities or deleterious physical properties relevant to valuations

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Previous Dart Results

Highlight assays from Dart’s first hole, CBADD001, ( ASX: DTM 10 November 2025 ) include:

• 5.0m @ 4.33% Sb + 1.69 g/t Au + 23.65 g/t Ag from 41.5m;

• including 0.65m @ 32.20% Sb + 2.91 g/t Au + 10.50 g/t Ag from 42.0;

• 0.5m @ 2.53 g/t Au from 42.65m and

• 0.7m @ 5.61 g/t Au + 154 g/t Ag from 45.4m.

• 1.6m @ 9.47% Sb + 0.35 g/t Au + 4.09 g/t Ag from 68.2m;

• including 0.5m @ 29.60% Sb + 0.65 g/t Au + 12.60 g/t Ag from 68.7.

Dart Mining rock chip sampling revealed high grade antimony, gold and silver ( ASX: DTM Announcement 10 Oct 2025 ). Assays received across 9 samples of float and in situ veins across the historic Banshee antimony mine area include:

• Antimony results up to 65.3% Sb and 55.5% Sb

• Gold grades up to 17.0g/t Au and 15.05g/t Au

• Silver assays up to 97.9g/t Ag and 66.7g/t Ag

Prior to Dart Mining, previous highlights across the project include:

• Highlights from 2014 drilling as per the GDM Prospectus (ASX: GDM Prospectus 2023 ): ▪ 3m @ 9.18% Sb in hole CNRC03 from 158m including 1m @ 25% Sb from 158m ;

• 6m @ 5.12% Sb & 1.55 g/t Au in hole CNRC04 from 77m;

• 3m @ 1.50% Sb & 8.53 g/t Au in hole CNRC05 from 18m;

• Rock chips of 44.9% Sb, 24.1% Sb, 39.9% Sb, and 39.4% Sb (ASX: GDM Prospectus 2023 ):

• Surface trenching includes 4m@ 3.09 g/t Au and 1.14% Sb and 1m @ 6.15 g/t Au and 3.1% Sb. While trenching, selective rock chips returned 3.65 g/t Au with 23.9% Sb , and 9.93 g/t Au with 7.56% Sb ( ASX: GDM Nov 2024 ).

NEXT STEPS

Dart Mining will progress farm-in exploration at Coonambula. In the first year of the farm-in Dart Mining intends to:

• Complete and interpret IP Survey results

• Continue to drill and test Banshee Antimony trend

• Refine Drill plan on results of IP Survey, with additional drilling targets expected to be generated.

• Develop a 3D model and declare a JORC resource at the earliest possible opportunity subject to drill results.

Approved for release by the Board of Directors.

For more information contact: James Chirnside Terry Bates Managing Director Director Dart Mining NL Dart Mining NL jchirnside@dartmining.com.au tbates@dartmining.com.au +61 419 605 842 InvestorHub Link

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About Dart Mining

The Triumph Gold Project is Dart’s first step into an advanced intrusion related gold system project in Queensland. Dart will look to develop a regional presence in Queensland through advanced stage intrusion related and epithermal gold projects. Dart is farming into the Coonambula Antimony-Gold Project in Central Queensland. Dart Mining will continue to evaluate several historic goldfields in Central and Northeast Victoria including the Rushworth Goldfield and the new porphyry and lithium province in Northeast Victoria identified by Dart. The area is prospective for precious, base, and strategic metals. Dart Mining has built a strategic and highly prospective gold exploration portfolio in Central and Northeast regions of Victoria, where historic surface and alluvial gold mining indicates the existence of potentially large gold endowment.

Competent Person’s Statement

The information in this report has been prepared, compiled, and verified by Mr Andrew Dawes, who is a Member of the Australasian Institute of Mining and Metallurgy and a Member of the Australian Institute of Geoscientists. Mr Andrew Dawes is employed by AHD Resources and consults to Dart Mining NL. Mr Dawes has sufficient experience that is relevant to the style of mineralisation and type of deposits under consideration and to the activity being undertaken to qualify as a competent person as defined in the 2012 Edition of the “Australasian Code for Reporting of Exploration Results, Mineral Resources and Ore Reserves”. Mr. Dawes takes responsibility for the exploration results, and consents to the inclusion in the report of the matters based on his information in the form and context in which it appears.

Forward-Looking Statement

Certain statements contained in this document constitute forward-looking statements. Forward-looking statements include, but are not limited to, Dart Mining’s current expectations, estimates and projections about the industry in which Dart Mining operates, and beliefs and assumptions regarding Dart Mining’s future performance. Such forward-looking statements are based on a number of estimates and assumptions made by the Company and its consultants in light of experience, current conditions and expectations of future developments which the Company believes are appropriate in the current circumstances. When used in this document, words such as; “anticipate”, “could”, “intends”, “estimate”, “potential”, “plan”, “seeks”, “may”, “should”, and similar expressions are forward-looking statements. Although Dart Mining believes that its expectations presented in these forward-looking statements are reasonable, such statements are subject to known and unknown risks, uncertainties and other factors, which may cause the actual results, achievements and performance of the Company to be materially different from the future results and achievements expressed or implied by such forward-looking statements. Investors are cautioned that forward-looking information is no guarantee of future performance and accordingly, investors are cautioned not to place undue reliance on these forward-looking statements.

No new information has been included in this release, all exploration results have been previously reported by Great Divide Mining (ASX: GDM) and are available on their website. Dart Mining is not aware of any new information or data that materially affects the information included in the original announcements.

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COONAMBULA ANTIMONY-GOLD PROJECT

The Coonambula Antimony-Gold Project ( Coonambula or Project ) is located approximately 390km by road north-northwest of Brisbane, Queensland. Coonambula is 70km southeast of the multimillion-ounce Cracow gold mine and 25km southwest of the Eidsvold goldfield (Figure 8). The Project is comprised of five granted Exploration Permits: EPM 15203, EPM 16216, EPM 25260, EPM 26743 and EPM 28433 covering 282 sq.km., and application EPM 29186 covering an area of 227sq.km.

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Figure 7 : Project Location Plan.

Geology – New England Fold Belt geology hosts high grade quartz veins containing Sb-Au at Hillgrove and Wild Cattle Creek in NSW, and Antimony at Neardie near Gympie QLD. Mineralisation at Coonambula is hosted within intrusive granodiorites and holds the potential to host a large intrusion related gold system, with attractive magnetic signature and structural geology.

Two distinct types of reef mineralisation occur: Gold associated with arsenopyrite in quartz and high-grade antimony with calcite in quartz. Disseminated stibnite is recorded in the gold lodes (Malnic, 1985).

Banshee is one of the largest historical antimony mining complexes in Central Queensland, located 70km Southeast of the Cracow gold mine and 25km SW of Eidsvold. Banshee is a historic highgrade direct shipping ore antimony mine (worked variously between 1876 and 1983, The Banshee

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Mine when reopened in 1983 produced 20t of ore containing 4t of Antimony ( GDM Prospectus 2023 ). 12 RC and 1 diamond drill hole have been drilled over 650m of strike length at Banshee.

Directly east of Banshee lies another Antimony-Gold prospect called Lady Mary (previously called Lady May). This prospect lies 1km along strike from Banshee, potentially along the same E-W Banshee structure. Surface rock chip samples from old mine dumps at Lady Mary have returned up to 49.6% Sb and 1.3 g/t Au ( GDM Sep 2024 ). The area between Banshee and Lady Mary has not yet been explored and is a high priority target being assessed by the current IP survey.

The Perseverance mine was mined to 132m depth with mining widths up to 10m wide ( GDM Prospectus 2023 ). Past production of gold from the mine was reported as 20kt @ 20g/t Au (Malnic, 1985) however only 3 drill holes have been completed to date.

Total strike of the prospective antimony zone is approximately 5km with historic mines either side of Banshee. Lady Mary located 900m east of Banshee with additional historic mines occurring some 3km west of Banshee giving a potential E-W strike of 5km. Individual high grade antimony shoots are interpreted as having a strike length of 30-100m each based upon Banshee drilling where 3 shoots of this length exist in the central core zone.

In GDM’s 2023 prospectus ( GDM Prospectus 2023 ) consulting company Derisk stated that it: “ Considers that the Coonambula project tenements are prospective for mesothermal vein and stockwork gold and gold-antimony deposits, as well as intrusion-related and epithermal gold deposits. Most work at this project has focused on areas in and around historical mine workings. Derisk considers there is potential to define extensions or repetitions of known mineralisation at some of the historical workings. There is also potential to discover new mineralisation but exploration for these targets is at a very early stage. ”

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Figure 8 : Banshee mine waste dump material observed (unsampled) by Dart Mining in January 2025 showing antimony mineral (70% stibnite) with encasing vein quartz.

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*Visual estimates of mineral abundance should never be considered a proxy or substitute for laboratory analyses where concentrations or grades are the factor of principal economic interest. Visual estimates also potentially provide no information regarding impurities or deleterious physical properties relevant to valuations

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Figure 9 : Coonambula geology and key prospects GDM Prospectus 2023).

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APPENDIX ONE:

TABLE 1 DRILL HOLE SUMMARY OF REPORTED DRILLING

Hole ID	Easting	Northing	Elevation	Max Depth (m)	Azimuth (deg)	Dip (deg)
CBADD001	291939	7173900	237	75.7	170	-55
CBADD002	291874	7173933	236	212.2	170	-65
CBADD003	291853	7173930	232	170.4	160	-55
CBADD004	291921	7173907	241	140.1	165	-50
CBADD005	292055	7173958	240	176.0	165	-50
CBADD005a	292058	7173948	240	86.0	165	-50
CBADD006	291848	7173863	235	68.1	170	-65
CBADD007	292120	7173970	240	164.0	165	-50
CBADD008	292133	7173920	240	90.0	165	-50
CBADD009	291868	7173883	237	80.0	170	-60
CBADD010	291999	7173863	240	110.0	350	-50

TABLE 2 MINERALISATION LOGGING DETAILS FOR CBADD004 THROUGH CBADD010

Hole ID	From	To	Width (m)	Mineral	Mineralisation Style	Mineral (%)	Comments
CBADD004	57.95	58.1	0.15	Stibnite	Veins	60	Massive stibnite
CBADD004	58.1	58.58	0.48	Stibnite	Veins and disseminated	3
CBADD004	58.58	58.9	0.32	Pyrite	Disseminated	5
CBADD004	58.9	59.05	0.15	Stibnite	Disseminated	1
CBADD004	59.05	59.6	0.55	Pyrite	Disseminated	5
CBADD004	59.6	63.6	4	Pyrite	Disseminated	0.5
CBADD004	63.6	64	0.4	Pyrite	Disseminated	3
CBADD004	64	64.15	0.15	Stibnite	Disseminated	1
CBADD004	64.15	64.6	0.45	Stibnite	Disseminated	15
CBADD004	64.6	66.1	1.5	Pyrite	Disseminated	2
CBADD004	66.1	66.5	0.4	Pyrite	Disseminated	5
CBADD004	66.5	66.6	0.1	Stibnite	Veins and disseminated	3
CBADD004	66.6	66.9	0.3	Stibnite	Disseminated	1
CBADD004	73.6	78.8	5.2	Pyrite	Veinlets	1
CBADD005	83.2	83.7	0.5	Stibnite	Veins	2
CBADD005	85.55	85.65	0.1	Stibnite	Veins	90	Massive stibnite
CBADD005	86.20	86.23	0.03	Stibnite	Vein	100	Massive Stibnite
CBADD005a	68.50	68.52	0.02	Stibnite	Vein	70
CBADD005a	69.5	69.8	0.3	Stibnite	Vein	5
CBADD005a	73.0	75.5	2.5	Stibnite	Vein and fault gouge	2	Stibnite in fault gouge as well
CBADD005a	76.0	76.1	0.1	Stibnite	Vein	2
CBADD006	8.7	8.8	0.1	Stibnite	Vein	100	Massive Stibnite
CBADD006	8.8	9.6	0.8	Stibnite	Vein	10
CBADD006	9.6	9.7	0.1	Stibnite	Vein	100	Massive Stibnite
CBADD007	139.8	141.1	0.3	Stibnite	Disseminated	2	Includes 2% pyrite
CBADD007	139.0	139.3	0.3	Stibnite	Vein and fault gouge	60	Stibnite in fault gouge as well
CBADD008	79.7	80.1	0.4	Pyrite	Disseminated	5
CBADD008	80.1	80.4	0.3	Pyrite	Veins and disseminated	10	1% Stibnite
CBADD008	80.4	80.9	0.5	Pyrite	Disseminated	10
CBADD009	43.5	43.6	0.1	Stibnite	Disseminated	3
CBADD009	48.0	48.4	0.4	Stibnite	Vein	7	Includes 4 zones of massive stibnite

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CBADD010	48.4	50.0	0.6	Pyrite	Disseminated	3
CBADD010	36.2	37.3	0.9	Stibnite	Vein	70	Also contains brecciated quartz veining
CBADD010	37.3	37.7	0.4	Stibnite	Vein	85	Massive Stibnite
CBADD010	37.9	38.4	0.5	Stibnite	Vein	100	Massive Stibnite
CBADD010	38.6	40.4	0.8	Stibnite	Vein	5	2 quartz/stibnite veins

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APPENDIX TWO

JORC Code, 2012 Edition – Table 1 report template Section 1 Sampling Techniques and Data

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

Criteria	JORC Code explanation	Commentary	Commentary
Sampling	• Nature and quality of sampling (eg cut	•	No sampling or results for the
techniques	channels, random chips, or specific specialised industry standard measurement tools appropriate to the		current drilling are reported and is not applicable
	minerals under investigation, such as
	down hole gamma sondes, or handheld
	XRF instruments, etc). These examples
	should not be taken as limiting the broad
	meaning of sampling.
	• Include reference to measures taken to
	ensure sample representivity and the
	appropriate calibration of any
	measurement tools or systems used.
	• Aspects of the determination of
	mineralisation that are Material to the
	Public Report.
	• In cases where ‘industry standard’ work
	has been done this would be relatively
	simple (eg ‘reverse circulation drilling
	was used to obtain 1 m samples from
	which 3 kg was pulverised to produce a
	30 g charge for fire assay’). In other
	cases more explanation may be
	required, such as where there is coarse
	gold that has inherent sampling
	problems. Unusual commodities or
	mineralisation types (eg submarine
	nodules) may warrant disclosure of
	detailed information.
Drilling	• Drill type (eg core, reverse circulation,	•	Standard tube NQ diamond drilling
techniques	open-hole hammer, rotary air blast,		was utilised with bottom of hole
	auger, Bangka, sonic, etc) and details (eg core diameter, triple or standard tube, depth of diamond tails, face- sampling bit or other type, whether core		core orientation completed every run. An Axis orientation tool was utilised.
	is oriented and if so, by what method,
	_etc). _
Drill	• Method of recording and assessing core	•	Core recoveries for DD was
sample	and chip sample recoveries and results		recorded by measuring the total
recovery	assessed.		amount of core between each core
	• Measures taken to maximise sample recovery and ensure representative nature of the samples. • Whether a relationship exists between		block. This was then compared to the recovery noted on the core block by the driller and any errors
	sample recovery and grade and whether		were rectified. The Rock Quality
	sample bias may have occurred due to		Designation (RQD) value is
	preferential loss/gain of fine/coarse material.		calculated by summing the total length of core in the run composed
			of pieces of core greater than 10
			cm in length. The recovery and RQD
			are both converted to a percentage
			of the recoveryduringthe data

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Criteria	JORC Code explanation	Commentary	Commentary
			entry phase.
Logging	• Whether core and chip samples have	•	The drill core has been geologically
	been geologically and geotechnically logged to a level of detail to support appropriate Mineral Resource estimation, mining studies and metallurgical studies.		and geotechnically logged to a level to support appropriate mineral resource estimation, mining studies and metallurgical studies. Core is
	• Whether logging is qualitative or		logged both qualitatively and
	quantitative in nature. Core (or costean,		quantitatively. Core and
	channel, etc) photography.		photography is available.
	• The total length and percentage of the
	_relevant intersections logged. _
Sub-	• If core, whether cut or sawn and whether	•	No sampling or results for the
sampling techniques and sample	quarter, half or all core taken. • If non-core, whether riffled, tube sampled, rotary split, etc and whether		current drilling are reported and is not applicable
preparation	sampled wet or dry.
	• For all sample types, the nature, quality
	and appropriateness of the sample
	preparation technique.
	• Quality control procedures adopted for
	all sub-sampling stages to maximise
	representivity of samples.
	• Measures taken to ensure that the
	sampling is representative of the in situ
	material collected, including for instance
	results for field duplicate/second-half
	sampling.
	• Whether sample sizes are appropriate to
	the grain size of the material being
	_sampled. _
Quality of	• The nature, quality and appropriateness	•	No sampling or results for the
assay data and laboratory	of the assaying and laboratory procedures used and whether the technique is considered partial or total.		current drilling are reported and is not applicable
tests	• For geophysical tools, spectrometers,
	handheld XRF instruments, etc, the
	parameters used in determining the
	analysis including instrument make and
	model, reading times, calibrations factors
	applied and their derivation, etc.
	• Nature of quality control procedures
	adopted (eg standards, blanks,
	duplicates, external laboratory checks)
	and whether acceptable levels of
	accuracy (ie lack of bias) and precision
	have been established.
Verification	• The verification of significant	•	No sampling or results for the
of sampling and	intersections by either independent or alternative company personnel. • The use of twinned holes.		current drilling are reported and is not applicable
assaying	• Documentation of primary data,
	data entry procedures, data
	verification, data storage (physical
	and electronic) protocols.
	• Discuss any adjustment to assay
	data.
Location of	• Accuracy and quality of surveys	•	The location of drill hole collars
data points	used to locate drill holes (collar and		were confirmed with a Trimble DA2
	down-hole surveys), trenches, mine		receiver and Catalyst 0.3m

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Criteria	JORC	Code explanation	Commentary	Commentary
		workings and other locations used		Subscription set to MGA94 Grid
		in Mineral Resource estimation.		Datum (Zone 56)
	• •	Specification of the grid system used. Quality and adequacy of topographic control.	• •	Accuracy is variable but is expected to be 0.3m During the mapping and Collar
				pickup process with constant visual
				quality assessment conducted, the
				receiver maintained an accuracy
				level <0.4m.
			•	Down hole, multi-shot surveys
				were taken at 15m then a nominal
				30 m interval where possible using
				a Trueshot survey tool. A 3m multi-
				shot survey was conducted at end
				of hole.
Data	•	Data spacing for reporting of	•	No sampling or results for the
spacing and distribution	•	Exploration Results. Whether the data spacing and distribution is sufficient to establish		current drilling are reported and is not applicable
		the degree of geological and grade
		continuity appropriate for the
		Mineral Resource and Ore Reserve
		estimation procedure(s) and
		classifications applied.
	•	Whether sample compositing has
		been applied.
Orientation	•	Whether the orientation of sampling	•	Drilling is typically orientated
of data in relation to geological structure	•	achieves unbiased sampling of possible structures and the extent to which this is known, considering the deposit type. If the relationship between the		perpendicular to the interpreted strike of mineralization where possible and a target declination of the drill hole of -55 degrees.
		drilling orientation and the
		orientation of key mineralised
		structures is considered to have
		introduced a sampling bias, this
		should be assessed and reported if
		material.
Sample	•	The measures taken to ensure	•	No sampling or results for the
security		sample security.		current drilling are reported and is
				not applicable
Audits or	•	The results of any audits or reviews	•	No audits or reviews have been
reviews		of sampling techniques and data.		completed of sampling techniques.

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Section 2 Reporting of Exploration Results

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

Criteria	JORC	Code explanation	Commentary	Commentary
Mineral	•	Type, reference name/number,	•	The Coonambula Project consists
tenement and land tenure status		location and ownership including agreements or material issues with third parties such as joint ventures, partnerships, overriding royalties, native title interests,		of six contiguous Queensland exploration permits for minerals (EPMs): o EPM 15203 (Widbury),
		historical sites, wilderness or		o EPM 16216 (Lady
		national park and environmental		Margaret),
		settings.		o EPM 25260
	•	The security of the tenure held at the time of reporting along with any known impediments to obtaining a licence to operate in		(Coonambula), o EPM 26743 (Eidsvold), and
		the area.		o EPM 28433 (Coonambula
				Extended).
			•	Each of the granted Coonambula
				tenements is currently held 100%
				by wholly owned subsidiaries of
				Great Divide Mining Ltd (GDM),
				namely GDM Coonambula Pty Ltd
				and GDM Yellow Jack Pty Ltd. Dart
				Mining Ltd has a joint venture
				agreement (Coonambula Joint
				Venture) to complete exploration
				works on the EPMs.
Exploration	•	Acknowledgment and appraisal of	•	Historical exploration in the
done by other		exploration by other parties.		Coonambula area has been
parties				undertaken by a number of
				parties since the 1970s, primarily
				targeting epithermal-style gold
				and base metal mineralisation.
			•	Work included regional geological
				mapping, soil and rock chip
				geochemistry, and limited
				geophysical surveys. More
				detailed exploration was carried
				out in the early 2000s by junior
				explorers, with emphasis on gold
				and antimony mineralisation
				associated with quartz veining.
			•	In 2013–2014, drilling programs
				were completed at the Banshee
				prospect under the direction of
				Paul Byrne. These programs
				tested near-surface quartz–
				sulphide veining and returned
				anomalous gold and antimony
				results.
			•	Data from these programs,
				including drill collar locations,
				assay results, and geological logs

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Criteria	JORC	Code explanation	Code explanation	Commentary	Commentary
					which were reported to the ASX
					by GDM
				•	Trenching programs were
					completed across the Banshee
					prospect to test surface
					geochemical anomalies and
					quartz–sulphide veining. These
					trenches exposed mineralised
					structures and returned
					anomalous gold and antimony
					values, providing key targets for
					subsequent drilling. The trenches
					themselves are historic
					(pre‑GDM), but GDM sampled and
					reported those trenches in 2024.
Geology	•	Deposit	type, geological setting	•	The Coonambula Project is
		and style of mineralisation.			located ~25 km southwest of
					Eidsvold in southeast Queensland,
					within the northern New England
					Orogen.
				•	Bedrock geology is dominated by
					Carboniferous to Permian–Triassic
					granitoid intrusions of the
					Rawbelle Batholith, intruding
					older metasedimentary
					sequences.
				•	Mineralisation at the Banshee
					Prospect is hosted within east–
					west trending shear zones and
					lodes developed in and adjacent
					to the granitoid intrusives.
				•	The Banshee system is
					characterised by antimony–gold
					(Sb–Au) mineralisation, with
					geological similarities to the
					Hillgrove Sb–Au deposit in New
					South Wales.
				•	Mineralisation occurs as stibnite ±
					quartz veins and breccia zones,
					with associated gold enrichment.
Drill hole	•	A summary of all information		•	Drillhole information has been
Information		material	to the understanding of		included in the release in
		the exploration results including a tabulation of the following			Appendix 1.
		information for all Material drill
		holes:
		o	easting and northing of
			the drill hole collar
		o	elevation or RL (Reduced
			Level – elevation above
			sea level in metres) of the
			drill hole collar
		o	dip and azimuth of the
			hole

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Criteria	JORC	Code explanation	Commentary	Commentary
		o down hole length and
		interception depth
		o hole length.
	•	If the exclusion of this information
		is justified on the basis that the
		information is not Material and this
		exclusion does not detract from
		the understanding of the report,
		the Competent Person should
		clearly explain why this is the
		_case. _
Data	•	In reporting Exploration Results,	•	No data aggregation methods
aggregation methods		weighting averaging techniques, maximum and/or minimum grade		have been applied.
		truncations (eg cutting of high
		grades) and cut-off grades are
		usually Material and should be
		stated.
	•	Where aggregate intercepts
		incorporate short lengths of high
		grade results and longer lengths of
		low grade results, the procedure
		used for such aggregation should
		be stated and some typical
		examples of such aggregations
		should be shown in detail.
	•	The assumptions used for any
		reporting of metal equivalent
		_values should be clearly stated. _
Relationship	•	These relationships are	•	Mineralisation widths are
between mineralisation widths and intercept lengths	•	particularly important in the reporting of Exploration Results. If the geometry of the mineralisation with respect to the drill hole angle is known, its nature should be reported.		reported as the downhole length. Final interpretation and inclusion of sample results will allow for true width calculations to be applied.
	•	If it is not known and only the
		down hole lengths are reported,
		there should be a clear statement
		to this effect (eg ‘down hole
		_length, true width not known’). _
Diagrams	•	Appropriate maps and sections	•	Included in the body of the
		(with scales) and tabulations of		announcement.
		intercepts should be included for
		any significant discovery being
		reported These should include, but
		not be limited to a plan view of drill
		hole collar locations and
		_appropriate sectional views. _
Balanced	•	Where comprehensive reporting of	•	All mineralisation intersected in
reporting		all Exploration Results is not practicable, representative reporting of both low and high		the completed hole has been included
		grades and/or widths should be
		practiced to avoid misleading
		_reporting of Exploration Results. _
Other	•	Other exploration data, if	•	No other material data is
substantive exploration		meaningful and material, should be reported including (but not		presented in this announcement.
data		limited to): geological
		observations; geophysical survey

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Criteria	JORC	Code explanation	Commentary	Commentary
		results; geochemical survey
		results; bulk samples – size and
		method of treatment; metallurgical
		test results; bulk density,
		groundwater, geotechnical and
		rock characteristics; potential
		deleterious or contaminating
		_substances. _
Further work	•	The nature and scale of planned	•	Plans for further work are
		further work (eg tests for lateral		outlined in the body of the
		extensions or depth extensions or		announcement which include
	•	large-scale step-out drilling). Diagrams clearly highlighting the areas of possible extensions, including the main geological		analysis of the drill core and continued drilling of Dart Mining’s planned locations.
		interpretations and future drilling
		areas, provided this information is
		_not commercially sensitive. _

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