King River Resources has delivered compelling high-grade gold assay results from its Mindoolah Project, reinforcing a robust pipeline of drill-ready targets ahead of an October RC program.
- Rock chips up to 44.3 g/t Au at Bertram’s and 16.95 g/t Au at Le Soleil
- Structural and geochemical models unify Bertram’s, Le Soleil, and Excelsior prospects
- Distinct polymetallic signature identified at Cundy broadens target styles
- Mafic intrusive gold mineralisation discovered at Mindoolah Main Reef
- Phase 2 RC drilling scheduled for early October 2026
High-Grade Gold Assays Validate Structural Controls at Mindoolah
King River Resources Ltd (ASX:KRR) has unveiled a series of high-grade gold rock chip results from its Mindoolah Gold Project in Western Australia’s Murchison Province, with assays peaking at 44.3 g/t Au at Bertram’s and 16.95 g/t Au at Le Soleil. These results crystallise the company’s evolving geological model, highlighting the tight coupling of gold mineralisation to well-defined structural corridors and intrusive contacts.
Managing Director Graham Gadsby emphasised the significance of the findings, noting that the shared gold-dominant, silver-poor geochemical signature across Bertram’s, Le Soleil, and Excelsior prospects supports a camp-scale hydrothermal system. This structural and geochemical coherence boosts confidence that similar high-grade zones may recur elsewhere within the project area.
Intrusive Dyke and Stockwork Vein Systems Dominate Key Prospects
Detailed pit mapping at Bertram’s revealed a prominent NE–SW felsic-intermediate intrusive dyke corridor within granite and granodiorite hosts. The gold mineralisation is concentrated in an oblique stockwork quartz vein network oriented roughly 45 degrees to the main structure, interpreted as zones of localized dilation during hydrothermal fluid flow. High-grade rock chip assays cluster tightly along these structural contacts, with multiple samples exceeding multi-ounce gold grades, underscoring the scale and continuity of the system.
Le Soleil mirrors this structural setting, featuring cross-cutting NE–SW shear corridors intersecting a NW–SE Banded Iron Formation (BIF) unit. High-grade assays align with these structural junctions, with sample GM003965 returning 16.95 g/t Au adjacent to the BIF contact. Meanwhile, Excelsior shares the same granite-hosted intrusive dyke and stockwork vein architecture, although sampling was limited by pit conditions. Historic grab samples confirm a 'clean' gold-dominant geochemical signature consistent with the other prospects.
Cundy and Mindoolah Main Reef Introduce Complementary Target Styles
Contrasting with the intrusive-hosted systems, Cundy exhibits a broad, polymetallic BIF-associated style of mineralisation. Gold mineralisation here is hosted within quartz-vein and stockwork arrays offset from BIF contacts and fold hinges, producing a bulk-tonnage target. Surface rock chips returned up to 1.19 g/t Au alongside significant silver (44.4 g/t), arsenic, lead, and antimony, indicating low-temperature sulfidation processes.
Mindoolah Main Reef (MMR) has revealed a distinct mafic intrusive-hosted gold style, with a chlorite-altered mafic dyke sample grading 1.15 g/t Au. This dyke correlates with an untested ~100m aeromagnetic high anomaly, representing a high-priority target for upcoming drilling. The mafic intrusion’s iron-rich composition likely acts as a chemical trap for gold deposition, supported by elevated nickel, chromium, and vanadium concentrations.
Integrated Data Sets Shape Phase 2 Drilling Program
King River’s integration of high-resolution aeromagnetic data, multi-element geochemistry, and detailed structural mapping has refined the exploration framework across Mindoolah. The company plans a Phase 2 Reverse Circulation (RC) drilling campaign commencing in early October 2026, targeting down-dip and along-strike extensions of these mineralised corridors beneath shallow historic pits.
Pending results from Phase 1 stockpile drilling, analysed by PhotonAssay™ to address coarse gold variability, will complement these surface datasets. This multi-pronged approach aims to validate the structural controls on mineralisation and assess the economic potential of both high-grade veins and bulk-tonnage targets.
Bottom Line?
King River’s structural and geochemical insights at Mindoolah set the stage for a critical October drilling phase that could unlock significant high-grade and bulk-tonnage gold mineralisation.
Questions in the middle?
- Will Phase 2 drilling confirm continuity of high-grade gold along identified structural corridors?
- How will the distinct polymetallic signature at Cundy influence future exploration priorities?
- Can the mafic intrusive target at Mindoolah Main Reef yield economically viable mineralisation?