Vulcan: the opportunity

Vulcan is a data-rich exploration project in Queensland’s Silverwood district, covering approximately 279 km² across EPM 26994 and EPM 27724. Historical exploration identified copper, zinc, lead and silver sulphides. The current priority is to investigate a possible gold overprint that was not systematically tested. MineFinder owns 100% of the project. Historical Geological Survey of Queensland diamond drilling records near-surface copper-bearing sulphides at Grieves Quarry. Our revised geological model suggests a possible later gold overprint within the volcanic–carbonate setting. The next step is to review available core and assay for gold to decide whether drilling is justified. EPM 26994 is described by the company as granted; the status and conditions of EPM 27724 require confirmation before activities are planned on that permit.

The opportunity is to establish whether younger intrusive activity generated a substantial copper–gold system within the Silverwood district. A successful assessment could identify mineralised intrusive centres or associated targets beyond the historically drilled sulphide zones. Potential scale will be assessed through the extent and organisation of intrusive rocks, alteration, structures and metal distribution. The project area provides the search space; mapped geological relationships and exploration results will establish the size of individual targets. The porphyry hypothesis also directs attention to surrounding host rocks. Where intrusive fluids encounter favourable structures and reactive carbonate units, replacement or skarn mineralisation can form part of a wider system. These are settings to investigate at Vulcan. Their presence and relationship to a porphyry centre remain geological questions. The established sulphide mineralisation provides a parallel opportunity to test extensions and gold content. Together, these models broaden the exploration programme while providing specific observations against which each interpretation can be assessed.

Do the intrusive rocks, reported anomalies and mineralised host units define a preserved copper–gold mineral system with sufficient extent to justify drilling beyond the known sulphide zones? The assessment will test whether the essential components occur together: a suitable metal and heat source; fluid pathways; favourable sites for mineral deposition; and preservation of the prospective parts of the system. The relationships must also fit the timing of intrusion and mineralisation. A key parallel question is whether Grieves Quarry contains gold and whether its textures and alteration support volcanic-hosted massive sulphide mineralisation, later replacement, or a mineralising overprint.

Historical exploration concentrated on known base-metal occurrences. The historical Geological Survey of Queensland programme at Grieves Quarry comprised 17 diamond holes totalling 1,505 m and intersected copper–zinc–lead–silver sulphides. Later work included geochemical sampling, geological mapping and geophysical surveys. The 2021 Silverwood annual report identified porphyry copper–gold potential associated with concealed Early Triassic intrusions. At that time, it described this model as not previously specifically targeted. This is a documented historical exploration gap to assess against all subsequent work. The 2023 QMines interim report states that the historical GSQ programme did not assay for gold. Available core and records therefore provide an opportunity to add gold assays and examine the timing and controls of mineralisation.

MineFinder’s proposed approach brings the historical evidence into a single mineral systems assessment. Drilling, lithology, structures, intrusive geology, geochemistry and geophysics will be compared in their spatial and chronological context. The first task is to recover and locate the reported copper–gold and potassium anomalies. Their relationship to intrusive contacts, host rocks and existing drilling will determine which areas warrant field assessment. A potassium response will be checked against rock composition and surface materials before it is interpreted as alteration. Mapping, core examination and multi-element geochemistry can then test for mineralised vein networks, disseminated copper minerals, hydrothermal breccias and systematic alteration. These observations will help distinguish a porphyry system from other intrusion-related mineralisation and the established massive sulphide model. The result sought is a geological explanation that identifies where mineralisation could continue beneath cover and defines the most informative next drilling tests.

Historical Geological Survey of Queensland drilling at Grieves Quarry is reported in the company project summary as 27.2 m at 0.7% Cu, including 12.3 m at 1.2% Cu. The higher-grade interval is contained within the broader intersection. These are reported downhole lengths. The 2021 Silverwood report describes sulphides adjacent to and enclosed by limestone within a volcanic succession. The drilling demonstrates copper-bearing mineralisation; geological relationships and mineral textures will establish how it formed. The same report records copper–gold geochemical anomalies and potassium radiometric anomalies in mapped Connolly Volcanics. It also places the Herries Adamellite contact approximately 1 km west of Grieves Quarry and identifies concealed Early Triassic granitoids as a possible source of porphyry copper–gold mineralisation. These observations support a targeted assessment of the intrusive model. The original anomaly locations, sampling methods and radiometric data will be integrated with current geological mapping. The historical GSQ gold assay gap is independently described in the 2023 QMines interim report.

The mineral systems model tests how metals were sourced, transported, deposited and preserved. Two principal hypotheses guide the work: volcanic-hosted massive sulphide mineralisation in the older succession, and a younger intrusion-related copper–gold system. Their timing and possible interaction will be assessed. Metal and heat sources. The 2021 report identifies younger granitoids around the Silverwood succession and places the Herries Adamellite contact approximately 1 km west of Grieves Quarry. Assess intrusive composition, age and copper fertility. Test for concealed intrusive extensions and smaller centres. Fluid pathways. Historical mineralisation occurs within a volcanic and sedimentary succession that has undergone deformation and later intrusion. Map faults, fractures and intrusive contacts. Establish which structures carried mineralising fluids and how they connect at depth. Host rocks and deposition. At Grieves Quarry, base-metal sulphides occur adjacent to and within limestone in a volcanic succession. Examine sulphide textures and mineral assemblages to distinguish volcanic-hosted mineralisation, replacement and any later intrusive overprint. Alteration and metal distribution. The 2021 report describes copper–gold geochemical anomalies and potassium radiometric anomalies within mapped Connolly Volcanics. Recover the original datasets and assess their spatial relationships. Check whether potassium enrichment reflects hydrothermal alteration, rock composition or surface materials. Timing of mineralisation. Older volcanic and sedimentary rocks occur with younger intrusions, providing the setting for potentially separate mineralising events. Use cross-cutting relationships, mineral textures and suitable age dating to test whether sulphides and veins formed before, during or after intrusion. Preservation and potential scale. The historical review describes soil cover across much of the area, limiting direct observation of bedrock. Assess erosion level, cover and fault displacement. Measure any coherent alteration and metal footprint and determine whether prospective parts of the system remain preserved. A coherent porphyry interpretation would require compatible intrusive chemistry, mineralised veins or disseminations, alteration and metal distribution. Skarn or carbonate replacement could represent associated targets where the geological relationships support that interpretation. Regional structure: the Demon Fault and Silverwood The Demon Fault adds a regional structural dimension to Vulcan’s mineral systems assessment. This approximately 200–215 km, broadly north–south fault system in northeastern NSW records predominantly right-lateral movement. Structural research identifies several segments and branches, with estimated horizontal offsets of approximately 19–35 km. These relationships provide a framework for reconstructing rocks and structures that later deformation has separated (Babaahmadi & Rosenbaum, 2013). The published Silverwood connection is specific. Rosenbaum and colleagues (2021) interpret the Willowie Creek beds in northern NSW as a possible continuation of the Silverwood Block, displaced approximately 25 km by the Demon Fault. This connects Silverwood-correlated rocks to a major regional structure. The relationship between the fault’s northern branches and structures on Vulcan remains a question for local mapping and geophysical interpretation. Timing determines how this evidence informs the porphyry model. Fault-gouge dating establishes Late Jurassic movement at approximately 163–152 million years. The fault displaces older Triassic granitoids. The dated deformation therefore postdates the intrusive episode relevant to Vulcan’s concealed-granitoid hypothesis. Earlier structural inheritance requires separate assessment (Babaahmadi, Uysal & Rosenbaum, 2019). For Vulcan, the exploration opportunity is to reconstruct the mineral system through time. We will assess whether older structures helped localise intrusive centres and mineralising fluids, and whether later movement displaced intrusive contacts, alteration or mineralised zones. Structural intersections become useful targets when their geometry, age and relationship to mineralisation fit the geological model. The practical test is to compare published fault traces and northern branches with local structures, intrusive contacts, geochemical anomalies and current project boundaries. Core textures, cross-cutting veins and suitable age dating can then help distinguish mineralising pathways from younger deformation. This work can improve target geometry and identify prospective parts of an older system that remain concealed or displaced.

Define the geometry and potential extent of the mineral system. Locate historical samples and drillholes, measure anomaly dimensions and establish how they relate to mapped and interpreted intrusions. Assess intrusive fertility and alteration. Petrography, multi-element chemistry and field relationships will test whether the local intrusions have characteristics compatible with copper–gold mineralisation. Resolve timing and preservation. Core textures, cross-cutting relationships and suitable age dating can distinguish mineralising events. Geological reconstruction will assess erosion level, fault displacement and the potential for concealed targets. Test gold distribution in the known sulphides. Representative assays, linked to lithology and alteration, will establish whether gold is present and which geological features control it. Compile a target portfolio with measured dimensions, geological predictions and drill tests that can distinguish the competing models.

Stage 1 — Pre-listing gold assays. During Q4 2026 to Q1 2027, review available preserved core and original records from the historical 17-hole, 1,505 m diamond programme. Relog the core and assay representative intervals for gold. Logging will document host rocks, sulphides, veins, alteration and cross-cutting relationships. Stage 2 — Mineral systems compilation and field assessment. Integrate the historical geochemistry with magnetic and radiometric data. Check the reported anomalies on the ground and assess intrusive contacts, structures and reactive host rocks. Compare published Demon Fault branches with local structures and current project boundaries, then test which structures were active during intrusion and mineralisation. Define the spatial extent and geological significance of any coherent target areas. Stage 3 — Target definition and drilling design. Select geophysical methods for the geological question and expected physical properties. Combine the results with mapping and geochemistry to design tests of intrusive centres, possible replacement zones and sulphide extensions. The current raise funds the core review and gold-assay stage. Results will guide drill testing of confirmed targets or a partnership. New drilling is planned after the proposed Canadian TSXV CPC listing and associated financing, from Q2 2027. Field surveys and drilling will be separately scoped and costed, with access and permit requirements confirmed for each work area.

The next investment decisions will use measurable geological results: anomaly dimensions, alteration and vein relationships, intrusive chemistry, mineralisation timing and the predicted position of targets beneath cover. Targets that bring several independent observations together will receive priority. Geological interpretation will guide the choice of geophysical methods and drill orientation. Gold assays at Grieves Quarry will inform the sulphide model; assessment of the wider intrusive copper–gold opportunity will use its own geological evidence. This approach provides a technical basis for allocating exploration expenditure and discussing a staged programme with potential partners.

MineFinder owns 100% of Vulcan. The project provides exposure to the established base-metal mineralisation and to the copper–gold potential assessed through the broader mineral systems programme. The commercial objective is to develop a technically supported target portfolio for further exploration, partnership or a separately funded explorer. A technical review would bring together the geological model, source datasets, current tenure and access position, and a costed next-stage programme. MineFinder welcomes discussions with exploration partners interested in assessing Vulcan’s intrusive copper–gold potential. Funding obligations and retained interests would be determined through an agreed transaction.