Great Southern Mining Limited · ASX:GSN
Great Southern Mining — Investor Presentation (November 2025)
19 slides from Great Southern Mining's investor presentation, November 2025
Slide 1: Provincial Scale Gold Exploration
Provincial Scale Gold Exploration ASX:GSN Funded with multiple shots on goal ASX:GSN • November 2025 November 2025
Slide 2: Important Information
Important Information Deposit Competent Person Employer Professional Institute Duketon, East Laverton and Mon Ami Exploration Results and Geological Interpretation Rachel Backus Great Southern Mining Limited AIG, AUSIMM Edinburgh Park Project Rachel Backus Great Southern Mining Limited AIG, AUSIMM C
Slide 3: A busy year with drilling underway on both sides of the country
QLD A busy year with drilling underway on both sides of the country Queensland Edinburgh Park Diamond drilling underway by Gold Fields Ltd at Edinburgh Park NT QLD WA SA Photo: RC drilling underway at Golden Boulder. NSW Western Australia Photo: Diamond Drilling underway. Edinburgh Park Duketon Gold
Slide 4: High Impact Exploration
High Impact Exploration Active on multiple projects ➢ Most impactful time in Great Southern’s history ➢ Golden Boulder discovery drill out - Drilling recommenced in late-October – first assays expected late-November ➢ Golden Boulder deep drilling – Co-funded by WA Government Exploration Incentive Sc
Slide 5: Advanced Western Australia Exploration Projects
Advanced Western Australia Exploration Projects NT WA LAVERTON Duketon Gold SA KALGOORLIE East Laverton PERTH Gold - Nickel Mon Ami Gold ASX:GSN • November 2025 4
Slide 6: Duketon Gold Project - Prime Location for >1Moz Gold Discoveries
Duketon Gold Project - Prime Location for >1Moz Gold Discoveries ➢ Major gold camps in the Laverton District have an average spacing of 30 to 40 km’s1 ➢ Laverton District has multiple +5Moz gold deposits, including Sunrise Dam, Wallaby and Garden Well ➢ GSN has over 12 priority targets in the core o
Slide 7: Duketon Gold Project
Duketon Gold Project Accelerated Exploration Program Started 420 km2 of highly prospective gold exploration tenure ➢ Located between Regis (ASX:RRL, Mcap $4.7bn, FY26 production guidance of 350koz-380koz1) and Genesis (ASX: GMD, Mcap $6.9bn, FY26 production guidance of 260koz-290koz2) ➢ Prior to GSN
Slide 8: Golden Boulder: Potential for Major Gold Discovery
Golden Boulder Potential for Major Gold Discovery ➢ Golden Boulder sits on the N-W structural trend host to Rosemont (>2.5m oz), Banyego (380koz), Ben Hur (390koz) and multiple others ➢ 1.5km of mineralised strike already identified, including ~650m of semi- contiguous mineralisation ➢ Mineralisatio
Slide 9: Golden Boulder: Drilling Underway
Golden Boulder Drilling Underway ~7,000 RC drilling program underway with three core objectives ➢ Define a maiden JORC Mineral Resource in the north of prospect – currently ~650m of semi-contiguous gold ➢ Extend mineralisation to the south along – currently ~1.7 km of further gold anomalism defined
Slide 10: Duketon Gold: Amy Clarke +5km gold anomaly
Duketon Gold Amy Clarke +5km gold anomaly ➢ Over 5 km surface gold anomaly identified in shallow aircore drilling and soil geochemistry ➢ Recent drilling extended significant intercepts over a 4.5 km strike ➢ Last major drilling campaign prior to GSN ownership was broad-spaced shallow vacuum and air
Slide 11: Southern Star: Sale and Strategic Relationship with Regis
Southern Star Sale and Strategic Relationship with Regis ➢ GSN is drilling for company making, +1 Moz gold ore bodies for which the region is renowned ❖ Rosemont – +3Moz ❖ Garden Well – +5Moz ❖ Moolart Well – +2.5Moz NT ➢ For smaller discoveries, GSN and Regis (ASX:RRL, Mkt cap $4.7bn) entered into
Slide 12: Edinburgh Park – Provincial Scale – A Sleeping Giant of Australian Exploration
Edinburgh Park – Provincial Scale – A Sleeping Giant of Australian Exploration ASX:GSN • November 2025 11
Slide 13: Edinburgh Park: Potential for Major Gold Discovery
Golden Boulder Potential for Major Gold Discovery ➢ 1750km2 of highly prospective for porphyry gold-copper-silver mineral systems ➢ Over 20 porphyry and intrusive related gold targets identified by GSN ➢ Tenure accumulated over a decade, following Chairman, John Turpin’s Conquest Mining Limited’s di
Slide 14: Leichhardt Creek
Leichhardt Creek Massive Intrusive Related Gold Potential ➢ Large scale: 2.4 km of Induced Polarisation (IP) anomalies1 ➢ Interpreted sulphide caps over deeper porphyry intrusions ➢ Overlain by gold and base metal anomalies at the surface ➢ Mapped sulphides in overlying rock outcrops ➢ IP targets co
Slide 15: Mt Dillon
Mt Dillon Potential for a concealed monster ➢ Target defined by a large-scale IP anomaly under a quartz lithocap (Mt Dillon)* ➢ Interpreted as a preserved porphyry or epithermal system ➢ Abundant clay-pyrite-silica alteration surrounds the lithocap ➢ Outcropping alteration is consistent with a high-
Slide 16: Edinburgh Park
Edinburgh Park Exploration still in the early stages ML2 Further targets emerging Leichhardt Creek ➢ The success of the project will not be limited to the existing IP targets at Leichhardt Creek and Mt Dillon Mt Dillon ➢ A pipeline of targets is emerging from Edinburgh Castle Molongle ongoing geophy
Slide 17: East Laverton Project
East Laverton Project Diorite Hill PGE – The wildcard in the portfolio ➢ Diorite Hill is a massive, 8,000 m thick layered intrusive complex – prominent on regional aeromagnetic surveys ➢ Reprocessing of regional seismic and magnetic geophysics has defined several horizons considered prospective for
Slide 18: Corporate Snapshot and Board of Directors
Shareholders Corporate Snapshot John Terpu Executive Chairman Top 20 (excl. Directors Over 22 years’ experience in the mining & exploration Directors BOARD OF DIRECTORS and Gold Fields) 18% 27% sector, through acquisition and investment in many projects. Founder of Conquest Mining which discovered t
Slide 19: Contact Us
Contact Us Matthew Keane Managing Director E: [email protected] T: 08 9240 4111 ASX:GSN • November 2025 ASX:GSN
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