Great Southern Copper Plc · LSE:GSCU
Great Southern Copper — Investor Presentation (January 2026)
28 slides from Great Southern Copper's investor presentation, January 2026
Slide 1: Chile Focussed Copper-Gold-Silver Exploration
Chile Focussed Copper-Gold-Silver Exploration Corporate Presentation: January 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: GSCU in Chile: Especularita Project
GSCU in Chile: Especularita Project • Chile – Largest producer and exporter of copper – Tier 1 jurisdiction – 100% foreign ownership allowed • Coastal metallanogenic belt – Deposit type optionality – PCD / IOCG / IRCG – Excellent infrastructure in place – Cheaper exploration – Under-explored • Espec
Slide 4: Especularita: An Emerging Cu District
Especularita: An Emerging Cu District “50Mt Contained Cu within 50km radius of Especularita.” Mine Operations: • Los Pelambres (Antofagasta plc) • Carmen de Andacollo (Teck) London Underground Development activity: Circle Line • Altar porphyry Cu deposit, Argentina (CDNX:ALDE) – advancing to PFS (20
Slide 5: 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 ➢ Abundant historical workings and mines Altar El Espino project Los Vilos Cu-Au • Deposit type optionality Po
Slide 6: Strategy for Success: Two Drill Discoveries in 2025
Strategy for Success: Two Drill Discoveries in 2025 Aggressive low-cost Large footprint projects in exploration strategy emerging copper district Drilling pipeline at High grade Cu-Ag Especularita beyond 2026 discovery at Mostaza Mine Porphyry Cu-Au / IOCG / Activity drives continuous IRG exploratio
Slide 7: Drilling Delivers Two Discoveries in 2025
Drilling Delivers Two Discoveries in 2025 1. Mostaza Cu-Ag, Cerro Negro: ▪ High-grade Cu-Ag IS-type mineralisation discovered ▪ 3,000m diamond drilling in 2025 ▪ Phase III resource and exploration drilling in progress ▪ Mineralisation identified over >2.5km trend ▪ Drilling to target >2-5Mt high-gra
Slide 8: High-Grade Cu-Ag Discovery at Mostaza, Cerro Negro
High-Grade Cu-Ag Discovery at Mostaza, Cerro Negro • First hole CNG25-DD001 at Mostaza mine (Lens 2) 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 dril
Slide 9: Mostaza Deposit: High Cu-Ag Grades in Drilling
Mostaza Deposit: 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 9
Slide 10: Cerro Negro: Work Plan 2026
Cerro Negro: Work Plan 2026 Key Objectives: 1. Define Mostaza Cu-Ag resource (in progress) 2. Target mineralisation along trend (in progress) DD001 –DD005 DD006 – DD009 3. Test porphyry Cu-Au at depth Work plan 2026: • 10,000m DD Mostaza • 5,000m scout RC • Metallurgy • Map/sample parallel structure
Slide 11: Exploration to Increase Scale – Regional IP
Exploration to Increase Scale – Regional IP 2 km Mostaza Fault trend Monolith Monolith IP Chargeability Rock Chip Cu (ppm) Rock chip Ag (g/t) LSE:GSCU 11
Slide 12: Monolith: New High-Grade Cu-Ag Target
Monolith: New High-Grade Cu-Ag Target Oxide Cu over 50m LSE:GSCU 12
Slide 13: MFZ - Hanging wall Cu: New Cu-Ag Target
MFZ - Hanging wall Cu: New Cu-Ag Target W >100m E Brecciated volcanics with oxide Cu Silicified fault rock with oxide Cu Mag fault breccia with oxide Cu and and artisanal workings and artisanal workings artisanal workings LSE:GSCU 13
Slide 14: Viuda Prospect: Maricunga Au Porphyry in Coastal Belt
Viuda Prospect: Maricunga Au Porphyry in Coastal Belt 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 deposit in AA Argentina • Scout RC drilling
Slide 15: Viuda: Zoned Porphyry Au-Cu System
Viuda: Zoned Porphyry Au-Cu System Viuda Negra: • Landsat 8 spectral anomaly indicative of broad clay-silica Chl-epi-mag zone Viuda Negra: alteration system - Scout drilling • Mapping and sampling identifies Maricunga style quartz veining and stockwork in outcrop with anomalous Au-Ag • Scout diamond
Slide 16: Viuda Negra: Scout Diamond Drilling
Viuda Negra: Scout Diamond Drilling Rock Chip / Channel Chip: 1m @ 4.2 g/t Au, 0.12 % Cu 1m @ 0.5 g/t Au, 0.16 % Cu 1m @ 0.4 g/t Au. 0.11 % Cu 0.2 g/t Au, 0.13% Cu 73m @ 0.14 g/t Au & 0.1% Cu from 11m Including: 14.2m @ 0.21 g/t Au & 0.11% Cu from 11m Rock Chip: 29.9 g/t Ag 24.7 g/t Ag 1m @ 17.2 g/t
Slide 17: Viuda Negra: How Close to the Big One?
Viuda Negra: How Close to the Big One? Viuda Negra 73m @ 0.14 g/t Au & 0.1% Cu from 11m Including: Section for scale 14.2m @ 0.21 g/t Au & 0.11% Cu from 11m 121.5m @ 0.11 g/t Au & 0.05% Cu from 6.5m Including: 6.7m @ 0.39 g/t Au & 0.12% Cu from 43.1 Caspiche – 1.47 Bt @ 0.51 Au g/t & 0.2% Cu (Exeter
Slide 18: Especularita: Multi-Target Opportunity
Especularita: Multi-Target Opportunity IOCG Targets Porphyry Cu-Au Targets IRCG Targets 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 Rulos El Espino IOCG dep
Slide 19: Especularita: Multi-Target Opportunity
Especularita: Multi-Target Opportunity IOCG Targets Porphyry Cu-Au Targets IRCG Targets Lipa (Drill-ready) Los Alamos Teresita (RC drilling) Aurelia (drill-ready) London Underground Circle Line LSE:GSCU 19
Slide 20: Advancing Prospects Through The Discovery Pipe-Line
Advancing Prospects Through The Discovery Pipe-Line Early Stage: Intermediate Stage: Advanced Stage: • Rulos (IOCG) • Cerro Negro • Mostaza Mine • Brechia Amallia • Aurelia (Skarn / IOCG) (IS/Porphyry) (IRGC) • Viuda (Porphyry Au) • Victoria (IRGS) • Lipa / Sauce (PCD) Grass-roots Exploration Prospe
Slide 21: Especularita: Drilling Plan 2026
Especularita: Drilling Plan 2026 Brechia Amarilla Lipa / Victoria / Sauce 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 Sauce/Megalo ✓ 1,40
Slide 22: Value Opportunity at Especularita – The Drilling Effect
Value Opportunity at Especularita – The Drilling Effect • Drilling has the potential to add real value GSC Market Cap Before and After Drilling 100 • Sustained drilling leading to discovery and 90 resource drilling adds exponential value The Lassonde Curve 80 • Increased value attracts potential for
Slide 23: 2026 Exploration Programme
2026 Exploration Programme Q1 Q2 Q3 Q4 ESPECULARITA PROJECT Especularita • Cerro Negro – fast-track resource drilling at Mostaza Mostaza drilling (Phase IV) mine, plus metallurgy, geotech, base-line environmental and water studies Cerro Negro regional • Cerro Negro – regional exploration including g
Slide 24: Corporate Information – Dec 2025
Corporate Information – Dec 2025 Board Holdings and Major Shareholders (>3%) Company Information Foreign Dimensions Pty 43.03%* INFORMATION AS AT JA6 2025 Lowell Resources Fund 4.53% Sam Garrett (Director) 1.92% Other Directors 1.45% Ticker Market Market Cap Share price Shares in issue Brokers GSCU
Slide 25: 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 26: 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 27: 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 28: Great Southern Copper PLC
Great Southern Copper PLC Sam Garrett, CEO Martin Page, CFO Charles Bond, Chairman Website: www.gscplc.com BlytheRay (Financial PR) Megan Ray Said Izagaren Tel: +44 (0) 20 7138 3204 Email: [email protected] @greatscopper Great Southern Copper 28
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