Slide 1: The S41 Breccia-Hosted Gold Prospect
For personal use only Finding the energy metals the world needs for a low-carbon future The S41 Breccia-Hosted Gold Prospect AIG Victorian Round-Up – 26-27 June 2025 1
Slide 2: Disclaimer
Disclaimer ● This presentation contains only an overview of Stavely Minerals Limited (“Stavely" or the “Company”) and its activities and operations. The contents of this presentation, including matters relating to the geology and exploration potential of For personal use only the Company’s projects,
Slide 3: Presentation Outline
Presentation Outline 1. Geology and structure of the Stavely Volcanic Belt For personal use only 2. The Cayley Lode Setting 3. How was the S41 target identified? 4. The S41 Breccia-Hosted Gold Prospect 5. First-pass aircore drilling results 6. Diamond drill hole SMD001 7. Carbonate base-metal gold s
Slide 4: Geology and structure of the Stavely Volcanic Belt
For personal use only Geology and structure of the Stavely Volcanic Belt 4
Slide 5: Regional Geology and Structure
Regional Geology and Structure ● Located in the Grampians / Stavely Zone For personal use only ● Host sequence includes (probable) Late-Proterozoic serpentinised ultramafic and Late-Cambrian turbidites, tuffs, andesitic flows (most hyaloclastite) and dolerite, granodiorite, tonalite, diorite and dac
Slide 6: Regional Geology and Structure
Regional Geology and Structure ● The Cambrian-age volcanic belts have For personal use only been subjected to Devonian-age D4 deformation ● All of the historic prospects are in a small ‘window’ of sub-crop ● Stavely Minerals tenure covers ~130km of fertile volcanic arc 6
Slide 7: Regional Geology and Structure
Regional Geology and Structure For personal use only 7
Slide 8: Stavely Copper-Gold Project – Thursday's Gossan
Stavely Copper-Gold Project – Thursday’s Gossan For personal use only 8
Slide 9: Regional Geology and Structure
Regional Geology and Structure ● The Cambrian-age Stavely Volcanic Belt is exposed or under shallow cover for about 20km south of the For personal use only Grampians ● All of the historic prospects are in this ‘window’ of sub- crop ● Approximately 80% transported cover and Newer Volcanics basalt cov
Slide 10: The Cayley Lode Setting
For personal use only The Cayley Lode Setting 10
Slide 11: The Discovery
The Discovery SMD050 32m at 5.88% copper, 1.00g/t gold and 58g/t silver, from For personal use only ● 62m drill depth, including: ● 12m at 14.3% copper, 2.26g/t gold and 145g/t silver from 82m, including: ● 2m at 40% copper, 3.00g/t gold and 517g/t silver ● Surprisingly, SMD050 also intersected: ● 4
Slide 12: Cayley Lode Discovery
Cayley Lode Discovery ● Magma / Butte copper lode-style system – outstanding exploration target never before seen in For personal use only Australia ● Mineralisation so far defined over ~1.5 km strike length to ~300m depth, averaging 10-50m thickness ● Resource drilling completed on ~40m X 40m drill
Slide 13: Cayley Lode – SURPAC Sections
Cayley Lode – SURPAC SECTIONS Composite section – key elements Ultramafic Contact Fault (magenta) For personal use only ● ● Early Microdiorite (green) – smaller green shape is late-microdiorite ● LKD diorite dyke – Devonian age but a proxy for the low-angle structure (brown) ● Drill hole traces colo
Slide 14: Cayley Lode – SURPAC Sections
Cayley Lode – SURPAC SECTIONS ● Grey shape – Alfa breccia, a pre- mineralisation phreato-magmatic For personal use only hydrothermal breccia 14
Slide 15: Stavely Alfa phreatomagmatic breccias
Stavely Alfa 1 phreatomagmatic breccias Magnetite- chalcopyrite mineralised For personal use only clast from depth? Polymictic breccia tuff from Corbett short course materials with permission
Slide 16: Search Space
Search Space Our search space: Tuff ring – Alfa breccia at Cayley ● High-level (at surface) tuff ring For personal use only at Cayley Lode ● Cu Lode-style at the Cayley Lode Cayley Lode ● Quartz-sulphide Au ± Cu at S41 Breccia Fairview North and Junction ● Carbonate base-metal gold at Fairview North
Slide 17: S41: How was the S41 prospect identified?
For personal use only S41: How was the S41 prospect identified? 17
Slide 18: Ground Gravity – Victor Porphyry Alteration
Ground Gravity – Victor Porphyry Alteration Gravity – not to be taken lightly For personal use only ● Right image: gravity colour drape on grey-scale 1VD magnetics ● Left image: classic porphyry concentric alteration from PIMA analysis of bottom of hole aircore drilling (after Spencer 1996) ● The in
Slide 19: Falcon gravity gradiometer
Falcon gravity gradiometer For personal use only 19
Slide 20: Emerging Discovery? – The S41 Breccia Prospect
Emerging Discovery? – The S41 Breccia Prospect S41 Breccia-Hosted Gold Prospect For personal use only ● Identified in Stavely Minerals’ Falcon Gravity Gradiometer® survey under 50m of basalt ● Mag lows – hydrothermal destruction of magnetite in the andesitic host ● Gravity highs with broader gravity
Slide 21: Emerging Discovery? – The S41 Breccia Prospect
Emerging Discovery? – The S41 Breccia Prospect S41 Breccia-Hosted Gold S41 Prospect For personal use only ● Identified in Stavely Minerals’ Falcon Gravity Gradiometer® survey under 50m of basalt ● Mag lows – hydrothermal destruction of magnetite in the andesitic host ● Gravity highs with broader gra
Slide 22: Target
For personal use only S41 Breccia-Hosted Gold Target 22
Slide 23: Emerging Discovery? – The Prospect
Emerging Discovery? – The S41 Breccia-Hosted Gold Prospect Magnetics Gravity S41 Prospect Aircore1 ● 4m at 2.21g/t Au from For personal use only 96m drill depth, including: ● 2m at 3.92g/t Au from 98m in aircore drilling ● Large 2km alteration zone ● Strongly anomalous base metals and pathfinder geo
Slide 24: S41 Aircore Geochem
S41 Aircore Geochem For personal use only STDD001 From Halley, internal Stavely report 2023 24
Slide 25: S41 Aircore Geochem
S41 Aircore Geochem For personal use only From Halley, internal Stavely report 2023 25
Slide 26: Emerging Discovery? – The S41 Breccia Prospect
Emerging Discovery? – The S41 Breccia Prospect S41 Diamond Drill Hole1 ● Only one diamond drill hole in the 2,000m x For personal use only 750m interpreted breccia system ● 1m at 2.16g/t Au from 282m drill depth ● 37m at 0.10g/t Au, including: ● 2m at 0.56g/t Au from 320m, and ● 5m at 24.3g/t Ag fro
Slide 27: Carbonate Base-Metal Gold Systems: Simplified attributes
For personal use only Carbonate Base-Metal Gold Systems: Simplified attributes 27
Slide 28: Breccia-hosted Carbonate – Base Metal – Gold Systems
Breccia-hosted Carbonate – Base Metal – Gold Systems Key attributes: ● Metal source – magmatic hydrothermal fluids, For personal use only moderate to high NaCl ● Plumbing – ground preparation / porosity through sub-volcanic to phreato-magmatic breccia pipes ● Metal precipitation mechanism – upwellin
Slide 29: Breccia-hosted Carbonate – Base Metal – Gold Systems
Breccia-hosted Carbonate – Base Metal – Gold Systems For personal use only ‘goldilocks’ gold precipitation zone With kind permission from Greg Corbett 29
Slide 30: Carbonate – Base Metal – Gold Mineralisation Examples
Carbonate – Base Metal – Gold Mineralisation Examples For personal use only Upper Ridges mine, Wau Papua New Frute Del Norte, Ecuador, Rhodochrosite Caylloma, Peru - 30,000g/t Ag Guinea and sulphides 3.5g/t Au & 6.3g/t Ag Kerikil, Mount Muro, Kalimantan ~10g/t Au Top row with kind permission from Gr
Slide 31: STDD001 – Geology, Geochemistry and Mineralogy
For personal use only STDD001 – Geology, Geochemistry and Mineralogy 31
Slide 32: Emerging Discovery? – The S41 Breccia Prospect
Emerging Discovery? – The S41 Breccia Prospect S41 Diamond Drill Hole1 ● Only one diamond drill hole in the 2,000m x For personal use only 750m interpreted breccia system ● 1m at 2.16g/t Au from 282m drill depth ● 37m at 0.10g/t Au, including: ● 2m at 0.56g/t Au from 320m, and ● 5m at 24.3g/t Ag fro
Slide 33: STDD001 – strip log and drill core photos
STDD001 – strip log and drill core photos 200m For personal use only 250m 300m 350m 400m 33
Slide 34: STDD001 – Down-Hole Geochem: classic signature
STDD001 – Down-Hole Geochem: classic signature Au_ppm Ag_ppm As_ppm Sb_ppm Pb_ppm Zn_ppm S_pct 0 0.1 0.2 0 5 10 15 0 100 200 300 0 10 20 0 100 200 0 200 400 0 5 70.7 70.7 70.7 70.7 70.7 70.7 70.7 79 79 79 79 79 79 79 88 88 88 88 88 88 88 For personal use only 96 96 96 96 96 96 96 105 105 105 105 105
Slide 35: STDD001 – Down-Hole Geochem: Major Elements
STDD001 – Down-Hole Geochem: Major Elements Na_pct Fe_pct Mn_ppm Mg_pct Ca_pct Mn+(0.1xMg) Au_ppm 0 2 4 6 0 5 10 0 1000 2000 0 2 4 0 5 10 0 2000 4000 6000 0 0.1 0.2 70.7 70.7 70.7 70.7 70.7 70.7 70.7 79 79 79 79 79 79 79 88 88 88 88 88 88 88 For personal use only 96 96 96 96 96 96 96 105 105 105 105
Slide 36: S41 Breccia Evolution – What processes can explain the geology?
For personal use only S41 Breccia Evolution – What processes can explain the geology, textures and chemistry? 36
Slide 37: Multi-phase Evolution
S41 Breccia-Hosted Gold Multi-phase Evolution For personal use only Fairview Andesite Breccia (sea-floor extrusive hyaloclastite), thickness unknown but in an upright sequence, maximum outcrop width is 2,500m (Buckland, 1982) High-level porphyry intrusions 37
Slide 38: Multi-phase Evolution
S41 Breccia-Hosted Gold Multi-phase Evolution For personal use only Volatile accumulation in intrusion carapace, explosive release and formation of sub- volcanic magmatic / hydrothermal breccia pipe. The magmatic breccias contain juvenile intrusion clasts. Ascending hydrothermal fluids result in qua
Slide 39: Multi-phase Evolution
S41 Breccia-Hosted Gold Multi-phase Evolution For personal use only Ascending volatiles dis- associate into cool, low-pH, carbonate-rich fluids which percolate downwards. 39
Slide 40: Multi-phase Evolution
S41 Breccia-Hosted Gold Multi-phase Evolution For personal use only Resurgent intrusion comes into contact with cool descending fluids. 40
Slide 41: Multi-phase Evolution
S41 Breccia-Hosted Gold Multi-phase Evolution For personal use only Explosive interaction of rising magma and descending cool fluids results in a phreato- magmatic milled-matrix breccia pipe that vents to the surface with associated tuff ring. 41
Slide 42: Multi-phase Evolution
S41 Breccia-Hosted Gold Multi-phase Evolution Late, metals-rich ascending fluids interact with low pH, For personal use only carbonate-rich descending cool fluids resulting in the deposition of carbonate, base-metal and gold (+silver). 42
Slide 43: Multi-phase Evolution
S41 Breccia-Hosted Gold Multi-phase Evolution Late, metals-rich ascending fluids interact with low pH, For personal use only carbonate-rich descending cool fluids resulting in the deposition of carbonate, base-metal and gold (+silver). Intrusion of late rhyolite dykes – they may arguably be from the
Slide 44: Multi-phase Evolution
S41 Breccia-Hosted Gold Multi-phase Evolution Late, metals-rich ascending fluids interact with low pH, For personal use only carbonate-rich descending cool fluids resulting in the deposition of carbonate, base-metal and gold (+silver). Intrusion of late rhyolite dykes – they may arguably be from the
Slide 45: Multi-phase Evolution
S41 Breccia-Hosted Gold Multi-phase Evolution Late, metals-rich ascending fluids interact with low pH, For personal use only carbonate-rich descending cool fluids resulting in the deposition of carbonate, base-metal and gold (+silver). Intrusion of late rhyolite dykes – they may arguably be from the
Slide 46: Multi-phase Evolution
S41 Breccia-Hosted Gold Multi-phase Evolution Late, metals-rich ascending fluids interact with low pH, For personal use only carbonate-rich descending cool fluids resulting in the deposition of carbonate, base-metal and gold (+silver). Intrusion of late rhyolite dykes – they may arguably be from the
Slide 47: Multi-phase Evolution
S41 Breccia-Hosted Gold Multi-phase Evolution For personal use only Erode away a ?few hundred metres and then cap with ~50m of much younger Newer Formation basalt (to ~4Ma). Then drill with 1 x diamond drill hole to 405.2m. 47
Slide 48: Multi-phase Evolution
S41 Breccia-Hosted Gold Multi-phase Evolution Late, metals-rich ascending fluids interact with low pH, For personal use only carbonate-rich descending cool fluids resulting in the deposition of carbonate, base-metal and gold (+silver). STDD001 384.0m (reflected light) Low-Fe sphalerite ✓ 48
Slide 49: Multi-phase Evolution
S41 Breccia-Hosted Gold Multi-phase Evolution Late, metals-rich ascending fluids interact with low pH, For personal use only carbonate-rich descending cool fluids resulting in the deposition of carbonate, base-metal and gold (+silver). Pyrite after low-temp marcasite ✓ Manganoan ankerite ✓ 49
Slide 50: Multi-phase Evolution
S41 Breccia-Hosted Gold Multi-phase Evolution Late, metals-rich ascending fluids interact with low pH, For personal use only carbonate-rich descending cool fluids resulting in the deposition of carbonate, base-metal and gold (+silver). STDD001 356.9m (reflected light) Galena and sphalerite ✓ paragen
Slide 51: Attributes
S41 Breccia-Hosted Gold: Attributes Au_ppm Mn+(0.1xMg) 0 0.1 0.2 0 2000 4000 6000 ● STDD001 drilled to 405.2m 70.7 79 70.7 79 ● Gold mineralisation associated with Pb 88 For personal use only 88 96 96 / Zn sulphides focused below rhyolite 105 105 114 114 dykes 123 123 132 141 132 141 ● Pale Fe-poor
Slide 52: Breccia-hosted Carbonate – Base Metal – Gold Systems
Breccia-hosted Carbonate – Base Metal – Gold Systems For personal use only ‘goldilocks’ gold precipitation zone With kind permission from Greg Corbett 52
Slide 53: Next Steps
For personal use only Next Steps 53
Slide 54: Emerging Discovery? – The Prospect
Emerging Discovery? – The S41 Breccia-Hosted Gold Prospect Magnetics Gravity S41 Prospect Geophysics1 ● Pending Induced For personal use only Polarisation (IP) Phase 2 geophysical program ● Should ‘see’ through the Phase 1 basalt and identify zones of better developed sulphide mineralisation – expec
Slide 55: Kidston Sheeted Veins and Orebodies – +5Moz
Kidston Sheeted Veins and Orebodies – +5Moz For personal use only 55
Slide 56: Kidston Sheeted Veins and Orebodies – +5Moz
Kidston Sheeted Veins and Orebodies – +5Moz For personal use only 400m 56
Slide 57: Kidston Sheeted Veins and Orebodies – +5Moz
Kidston Sheeted Veins and Orebodies – +5Moz For personal use only Red = 400m spaced aircore Blue = 200m spaced aircore 57
Slide 58: Contact Us
For personal use only Contact Us: Stavely Minerals Limited Level 1, 168 Stirling Highway Nedlands WA 6009 www.stavely.com.au info@stavely.com.au Ph: 08 9287 7630 The information in this presentation is extracted from information available to view on www.stavely.com.au. The Company confirms that it i
Slide 59: Appendix 1: Mineral Resources
For personal use only Appendix 1: Mineral Resources 59
Slide 60: Appendix 1: Mineral Resources Classifications
Appendix 1: Mineral Resources Classifications Table 1. Cayley Lode Initial Mineral Resource estimate Cut-off Grade Cont. Grade Cont. Grade Cont. Resource Resource Tonnes Material Category (Mt) Cu For personal use only (Cu %) (Cu %) (Au g/t) Au (oz) (Ag g/t) Ag (oz) (Mlbs) Primary Indicated 0.2 5.87