Great Southern Copper Plc · LSE:GSCU
Great Southern Copper — Investor Presentation (June 2026)
27 slides from Great Southern Copper's investor presentation, June 2026
Slide 1: Especularita Copper-Gold-Silver Project, Chile
Especularita Copper-Gold-Silver Project, Chile Corporate Presentation: June 2026 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: Investment Proposition: Why GSC?
Investment Proposition: Why GSC? Especularita is a large foot-print copper-gold-silver project in Chile with strong multi-level investment drivers: Leveraged to Cu bull market • Chile Tier 1 jurisdiction 1. Advanced high-grade Cu-Ag discovery: Cerro Negro • Cu-Au-Ag market drivers ➢ Opportunity to f
Slide 4: Especularita: Target / Scale / Location
Especularita: Target / Scale / Location • Large-scale 12,100 ha land package Coquimbo Andacollo Cu-Au mine ➢ Option to own 100% of project Port 1.7 Bt Cu ➢ Centred on La Colorada Lithocap N La Colorada Lithocap ➢ Abundant historical workings and mines PDC Altar El Espino project Los Vilos Cu-Au • De
Slide 5: 1: Cerro Negro
Especularita Cu-Au-Ag project, Chile 1: Cerro Negro Mostaza mine, Cerro Negro prospect LSE:GSCU 5
Slide 6: Cerro Negro: High-Grade Cu-Ag Discovery, Mostaza mine
Cerro Negro: High-Grade Cu-Ag Discovery, Mostaza mine Mostaza mine offers opportunity for starter-pit operation: Key project metrics: • Exploration drilling below old Mostaza mine discovers high-grade Cu-Ag • Mineralisation open along trend and at depth • Metallurgical study results pending High-gra
Slide 7: Mostaza mine (Lens 2): High Cu-Ag Grades in drilling
Mostaza mine (Lens 2): High Cu-Ag Grades in drilling 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 7
Slide 8: Cerro Negro: Work Plan 2026 to deliver resources
Cerro Negro: Work Plan 2026 to deliver resources Legend: Monolith N GSC Drill Collars Mineralisation at surface Phase I & II Mineralisation at depth Phase III Mostaza Fault Key Objectives: 1. Define Mostaza Cu-Ag Exploration drilling resource >2-5 Mt 2. Extend mineralisation along Lens 1 trend >5-10
Slide 9: Cerro Negro: Work plan to increase scale 2026
Cerro Negro: Work plan to increase scale 2026 2.5 km Mostaza Fault trend Monolith Monolith IP Chargeability Rock Chip Cu (ppm) Rock chip Ag (g/t) LSE:GSCU 9
Slide 10: 2: Viuda
Especularita Cu-Au-Ag project, Chile 2: Viuda Maricunga stockwork veining, Viuda Negra LSE:GSCU 10
Slide 11: Viuda: Maricunga gold porphyry discovery 2025
Viuda: Maricunga gold porphyry discovery 2025 • Scout drilling 2025 targeted anomalous Au-Ag-Cu in rock chip geochem associated with Maricunga style quartz 73m @ 0.14 g/t Au & 0.1% Cu stockwork alteration Including: 14.2m @ 0.21 g/t Au & 0.11% Cu • Holes intersected broad zones of low- grade gold ho
Slide 12: Viuda Negra: How Close to the Big One?
Viuda Negra: How Close to the Big One? Caspiche – 1.47 Bt @ 0.51 Au g/t & 0.2% Cu (Exeter Resource Corp 2010 MRE) Now part of Norte Abierto project (Barrick-Newmont) • GSC has discovered porphyry Au-Cu mineralisation at Viuda Negra • Broad intersections of low-grade gold are Viuda Negra indicative o
Slide 13: 3: La Colorada Lithocap
Especularita Cu-Au-Ag project, Chile 3: La Colorada Lithocap La Colorada lithocap viewed from Piedras Blancas LSE:GSCU 13
Slide 14: Lithocaps: Concealing the copper giants
Lithocaps: Concealing the copper giants LSE:GSCU 14
Slide 15: Lithocaps and the porphyry Cu model
Lithocaps and the porphyry Cu model • Lithocaps: ➢ Where preserved, lithocaps overly and conceal potential 1 porphyry Cu deposits at depth ➢ Formed by hot acidic fluids ascending from the porphyry and interaction with wall rocks ➢ May be mineralised (FSE, Tujuh Bukit) but not typical 4 ➢ Use high T
Slide 16: Especularita: Exploration state of play 2026
Especularita: Exploration state of play 2026 • Cerro Negro – Resource drilling: Coquimbo Andacollo Cu-Au mine Brechia Port 1.7 Bt Cu ➢ Mostaza mine resource drilling Phase IV N Amarilla La Colorada ➢ Target > 2-5 Mt high-grade Cu-Ag resource Lithocap PDC ➢ Metallurgy and mining studies Altar ➢ IP su
Slide 17: 4: District-scale copper
Especularita Cu-Au-Ag project, Chile Las Pelambres mine, Chile 4: District-scale copper LSE:GSCU 17
Slide 18: Especularita: An Emerging Cu District
Especularita: An Emerging Cu District “Project located within 50km radius of >85 Mt Contained Cu metal.” >85 Mine Operations: • Los Pelambres (Antofagasta plc) Mt Cu • Carmen de Andacollo (Teck) 16.1 Los Azules Development activity: • Altar porphyry Cu deposit, Argentina (CDNX:ALDE) Mt Cu ➢ 2.4 Bt @
Slide 19: Especularita: Multi-Target Opportunities untested
Especularita: Multi-Target Opportunities untested IOCG Targets Porphyry Cu-Au Targets IRCG Targets Black Betty La Colorada Bechia lithocap Amarilla Cerro Lipa Negro (Drill-ready) Los Alamos Victoria (Drill-ready) Lana Corina CPO • 454m of 0.79% Cu, 305ppm Mo Teresita Paclas (RC drilling) Viuda Los R
Slide 20: Especularita: Under-Explored Multi-Target Opportunity
Especularita: Under-Explored Multi-Target Opportunity IOCG Targets Porphyry Cu-Au Targets IRCG Targets Black Betty Lipa (Drill-ready) Los Alamos Viuda Teresita (RC drilling) Brechia Amarilla Aurelia (drill-ready) London Underground Circle Line LSE:GSCU 20
Slide 21: Especularita: Prospect pipe-line
Especularita: Prospect pipe-line Drivers for re-rating of GSC Mine development • Project drivers: ➢ Maiden resource for Mostaza Cerro Negro (Mostaza Mine) ➢ Metallurgy results Resource drilling ➢ Expansion of Cerro Negro system beyond Mostaza (eg; MFZ, Monolith) ➢ Continued gold success at Viuda Cer
Slide 22: Especularita: Drilling Plan 2026
Especularita: Drilling Plan 2026 Brechia Amarilla Lipa / Artemisa / Victoria Cerro Negro Teresita Viuda Aurelia • IR Cu-Au • IRGS • HS Cu-Ag • IRGS • HS Cu-Au • Skarn Cu+Au • Porphyry Cu • HS Cu-Au • Porphyry Cu-Au • Porphyry Cu • Porphyry Cu-Au ✓ 1,000m DD Phase I ✓ 2,000m scout RC Artemisa/Piedras
Slide 23: 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 24: Great Southern Copper PLC
Great Southern Copper PLC Sam Garrett, 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: [email protected] @greatscopper Great Southern Copper 24
Slide 25: Corporate Information – June 2026
Corporate Information – June 2026 Board Holdings and Major Shareholders (>3%) Company Information Foreign Dimensions Pty 42.85% INFORMATION AS AT JUN 2026 Lowell Resources Fund 3.43% Sam Garrett (Director) 1.89% Other Directors 1.56% Ticker Market Market Cap Share price Shares in issue Brokers GSCU
Slide 26: 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 27: 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
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