Great Southern Copper Plc · LSE:GSCU
Great Southern Copper — Investor Presentation (July 2025)
25 slides from Great Southern Copper's investor presentation, July 2025
Slide 1: Unlocking the Potential of a High-Grade Cu-Au-Ag District at Especularita
Unlocking the Potential of a High-Grade Cu-Au-Ag District at Especularita Corporate Presentation: July 2025 LSE: GSCU 1
Slide 2: Disclaimer
Disclaimer The information contained in these slides and the accompanying oral presentation (together, the "Presentation") have not been approved by an authorised person within the meaning of the Financial Services and Markets Act 2000 ("FSMA"). If any person is in any doubt as to the contents of th
Slide 3: High-Grade Discovery at Mostaza: 600% Above Historical Grades
High-Grade Discovery at Mostaza: 600% Above Historical Grades • First hole CNG25DD001 at Mostaza mine intersects; Key project metrics: ➢ 20m at 3.3% Cu and 270g/t Ag from 27m, ➢ Incl. 7m @ 5.72% Cu and 490g/t Ag from 31m High-grade Cu-Ag Infrastructure • Results up to 600% higher than historical dri
Slide 4: New Discovery Below Mostaza Cu-Ag Mine
New Discovery Below Mostaza Cu-Ag Mine • Historical mine with non-JORC resource 1. GSC sampling identifies • GSC identifies high grades in base of pit and high-grade Cu-Ag exploration potential along trend outcropping at the base of the old pit • Phase I drilling (1,002.6 m) discovers new high- grad
Slide 5: Mostaza Deposit: High Cu-Ag Grades
Mostaza Deposit: High Cu-Ag Grades Hole ID Metres Cu % Ag g/t DD001 20 3.3 270 incl 7 5.7 490 DD003 13 2.5 198 DD005 12 4.2 370 incl 7 5.1 450 DD007 5 5.9 99 incl 2.5 9.7 175 DD013 5 3 322 DD015 9.9 5.5 443 DD016 7.5 4.5 343 LSE:GSCU 5
Slide 6: Cerro Negro: Work Plan to Target Resources
Cerro Negro: Work Plan to Target Resources Key Objectives: 1. Increase Mostaza mine Cu-Ag-Au resource (in progress) 2. Target mineralisation along trend (in progress) DD001 –DD005 DD006 – DD009 3. Test porphyry Cu-Au at depth Work plan 2025-26: • 5,000m DD Mostaza • 5,000m scout RC • Metallurgy • Ma
Slide 7: Exploration to Increase Scale – Phase III Drilling
Exploration to Increase Scale – Phase III Drilling 2 km IP Chargeability Rock Chip Cu (ppm) Rock chip Ag (g/t) LSE:GSCU 7
Slide 8: Cerro Negro: Large-Scale Porphyry Upside
Cerro Negro: Large-Scale Porphyry Upside Cerro Negro features suggest porphyry Cu model High sulphidation cc-bo in GSC drill core Oxide Cu at surface along trend from Mostaza LSE:GSCU 8
Slide 9: Strategy for Success
Strategy for Success Aggressive low-cost Large footprint projects in exploration strategy emerging copper district Drilling pipeline at High grade Cu-Ag Especularita beyond 2025 discovery at Mostaza Mine Porphyry Cu-Au / IOCG / Activity drives continuous IRG exploration upside news flow High-grade c
Slide 10: Especularita: An Emerging Cu District
Especularita: An Emerging Cu District Brechia La Colorada “GSC’s high-grade Cu-Ag discovery hole at Mostaza Amarilla lithocap confirms Especularita as an emerging copper district.” GSC drill-ready prospects Cerro Development activity: Negro (Mostaza) • Altar porphyry Cu deposit, Argentina – advancin
Slide 11: Especularita: Target / Scale / Location
Especularita: Target / Scale / Location Coquimbo Andacollo Cu-Au mine Port 1.7 Bt Cu • Extensive under-explored lithocap N ➢ Porphyry Cu indicator > 75 km2 Piuquenes El Espino project • Abundant historical workings and mines Los Vilos Port Cu-Au ➢ Cu-Au workings surround lithocap Colorada Lithocap ➢
Slide 12: Especularita: Multi-Target Opportunity
Especularita: Multi-Target Opportunity IOCG Targets Porphyry Cu-Au Targets IRCG Targets Bechia La Colorada Amarilla lithocap Cerro Lipa Negro (Drill-ready) Los Alamos Victoria (Drill-ready) Lana Corina CPO • 454m of 0.79% Cu, 305ppm Mo Teresita Paclas (RC drilling) Los Rulos Viuda (RC drilling) El E
Slide 13: Especularita: Cu-Au-Ag Mega-trends
Especularita: Cu-Au-Ag Mega-trends N Los Andes Argentina Altar / Piuquenes S • 2.4 Bt @ 0.4% Cu Antofagasta Cerro Negro • HS/Porphyry Cu-Ag-Au El Espino (PuCobre) • IOCG • 123Mt of 0.66% Cu, 0.24g/t Au Lipa (Lithocap) • Porphyry Cu-Au-Mo Teresita Granodiorite • IRGS Au-Cu batholith Victoria • IRGS C
Slide 14: Especularita: Giant Spectral Anomaly
Especularita: Giant Spectral Anomaly Colorada Lithocap zone • Landsat8 spectral survey highlights the “Colorada Cerro Negro lithocap” as a giant colour anomaly • Coincident anomaly footprints for: Lipa / ➢ Clay-sericite (yellow Landsat) – altered feldspar Victoria ➢ Hematite (red Landsat) – oxidised
Slide 15: Advancing Prospects Through The Discovery Pipe-Line
Advancing Prospects Through The Discovery Pipe-Line Early Stage: Intermediate Stage: • Lipa (PCD) • Cerro Negro Advanced Stage: • Rulos (IOCG) • Aurelia (Skarn / IOCG) • Mostaza Mine • Brechia Amallia • Viuda (Porphyry) (HS/Porphyry) (PCD) • Victoria (IRGS) • Teresita (IRGS) Grass-roots Exploration
Slide 16: Especularita: Drilling Plan 2025-2026
Especularita: Drilling Plan 2025-2026 Brechia Amarilla Lipa / Victoria Lithocap Cerro Negro Teresita Viuda Aurelia / Rulos • IR Cu-Au • IRGS • HS Cu-Ag • HS Cu-Ag • IRGS • HS Cu-Au • Skarn Cu+Au • Porphyry Cu • HS Cu-Au • Porphyry Cu • Porphyry Cu-Au • Porphyry Cu • Porphyry Cu-Au ✓ 1,000m DD Phase
Slide 17: Value Scale – The Drilling Effect
Value Scale – The Drilling Effect Junior Copper Explorers in South America • Drilling has the potential to add real value Market Cap US$ m, March 2025 90 • Sustained drilling leading to discovery and MC (USD), 82.27 resource drilling adds exponential value 80 The Lassonde Curve 70 • Increased value
Slide 18: Viuda: Zoned Porphyry Au + Ag System
Viuda: Zoned Porphyry Au + Ag System Chl-epi-mag N zone Chl-epi-mag Advanced argillic (silica-clay) zone AA Viuda Chico Clay-ser-Fe-ox Pyrite-albite-clay zone Chl-epi-mag Chl-epi-mag Landsat 8 Drone magnetics LSE:GSCU 18
Slide 19: Viuda Porphyry Target: Scout RC drilling
Viuda Porphyry Target: Scout RC drilling Bajo de Alumbrera, Argentina • Annulus of weathered clay-rich alteration about silica core creates typical “bowl” type topographic depression • Analogous in scale and type with Bajo de Alumbrera copper AA deposit in Argentina • Scout RC drilling completed to
Slide 20: Corporate Information – June 2025
Corporate Information – June 2025 Board Holdings and Major Shareholders (>3%) Company Information Foreign Dimensions Pty 46.72%* INFORMATION AS AT JUNE 2025 Spreadex 3.12% Lowell Resources Fund 3.15% Sam Garrett (Director) 2.26% Ticker Market Market Cap Share price Shares in issue Brokers Other Dire
Slide 21: Board and Management
Board and Management Charles Bond: Chairman Nick Briers: Non-executive Director • Corporate finance lawyer with over 25 years of experience and has worked with • Over 25 years of experience in financial markets heading up Exchange Traded mining companies for the past 15 years Derivatives sales desks
Slide 22: 2025-26 Exploration Programme Proposal
2025-26 Exploration Programme Proposal Q1 Q2 Q3 Q4 ESPECULARITA PROJECT Especularita • Cerro Negro – fast-track resource drilling at Mostaza mine, plus Mostaza drilling metallurgy, geotech, base-line environmental and water studies • Cerro Negro – regional exploration including geophysics and RC Cer
Slide 23: Why Chile?
Why Chile? Chile is a Globally significant copper jurisdiction: MINISTRO HALES (CODELCO) Leading Copper Mines in Chile in 2020 • Largest producer and exporter of copper (by 1000 metric tonnes) CENTINELA* (ANTOFAGASTA MINERALS) • Largest reserves of copper and 4th largest for gold RADIOMIRO TOMIC (CO
Slide 24: Summary
Summary Chile Largest producer and exporter of copper Jurisdiction Tier 1 - Globally significant mining location Copper and gold Strong market drivers Drilling pipe-line Especularita Cu-Au: 6 drill-ready targets 100% mining rights Leveraged for success Infrastructure Well located near to roads, powe
Slide 25: Great Southern Copper PLC
Great Southern Copper PLC Sam Garratt, CEO Martin Page, CFO Charles Bond, Chairman Website: www.gscplc.com BlytheRay (Financial PR) Tim Blythe Megan Ray Said Izagaren Tel: +44 (0) 20 7138 3204 Email: gsc@blytheray.com @greatscopper Great Southern Copper 25
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