King River Resources Hits 44g/t Gold at Mindoolah Ahead of October Drill Push
Key Takeaways
- Rock chip assays at Bertram's returned up to 44.3 g/t Au, with three additional samples above 3 g/t Au, all spatially tied to a defined NE–SW intrusive dyke and stockwork corridor at the Mindoolah Gold Project.
- Structural mapping has now defined drill-ready targets across all five Mindoolah prospects — Bertram's, Le Soleil, Excelsior, Cundy, and Mindoolah Main Reef — spanning three distinct gold trap styles.
- The Phase 2 RC drill program is scheduled to commence early October 2026, with heritage survey approval from the Wajarri Yamaji People already secured as the key enabling milestone.
- Mindoolah Main Reef has been identified as a priority RC target, with a 1.15 g/t Au surface result correlating directly with an untested 100m-long aeromagnetic anomaly enriched in Ni, Cr, and V.
- KRR sold 13 million Tivan Ltd shares in August 2026, generating $3.29 million in net proceeds to support the upcoming drill campaign, while Phase 1 stockpile assays via PhotonAssay™ remain pending.
High-grade gold results sharpen the Mindoolah drill thesis
Rock chip assays returning up to 44.3 g/t Au at Bertram’s have confirmed that high-grade gold at the Mindoolah Gold Project is tightly coupled to well-defined structural corridors, sharpening the case for drilling across the entire camp. King River Resources (ASX: KRR) released the update on 1 September 2026, covering structural mapping and geochemical results across five prospects at the historically mined project, located approximately 70km north-west of Cue in the Murchison Province of Western Australia.
Structural mapping across all five prospects has now defined a pipeline of drill-ready targets ahead of the Phase 2 RC program, scheduled to commence in early October 2026. Completion of the first heritage survey with the Wajarri Yamaji People represents a key enabling milestone for drilling progression.
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Five prospects, three target styles — a multi-system gold camp takes shape
What makes Mindoolah compelling at this stage is not a single high-grade hit. It is the consistency of structural and geochemical signals across five separate prospects, each pointing to the same underlying gold system, or a closely related one.
Bertram’s, Le Soleil and Excelsior — a unified intrusive gold engine
Detailed structural mapping at Bertram’s has outlined a prominent NE–SW-trending felsic-intermediate intrusive dyke and contact corridor hosted within granite and granodiorite. The primary vein geometry is a dense array of oblique to sub-horizontal stockwork quartz veins oriented at approximately 45° to the main structural trend, interpreted to reflect localised dilation and extensional veining during hydrothermal fluid flow.
Key rock chip assay results from Bertram’s include:
- 44.3 g/t Au (GM003979)
- 22.6 g/t Au (GM003981)
- 8.96 g/t Au (GM003982)
- 3.06 g/t Au (GM003983)
Note that rock chip grab samples are subject to local nugget variability and serve primarily as structural vectors, as stated in the JORC disclosure accompanying this announcement.
At Le Soleil, surface assays returned 16.95 g/t Au (GM003965) and 8.96 g/t Au (GM003964) at mapped shear and Banded Iron Formation (BIF) junctions. Approximately 310m north at the Double Barrel Morepork prospect, sample GM003976 returned 8.11 g/t Au from a sub-vertical quartz vein exposed in old workings, associated with a local magnetic high.
Excelsior confirms the same granite-hosted intrusive dyke and ~45° stockwork vein geometry as Bertram’s. While standing water prevented surface sampling inside the pit floor during this program, pit face mapping and multi-element geochemistry from historical grab samples confirm Excelsior returns the same gold-dominant, silver-poor signature as Bertram’s and Le Soleil. The structural and geochemical continuity across all three prospects establishes a recurring, camp-scale intrusive hydrothermal template.
Cundy and Mindoolah Main Reef — two complementary target styles
Cundy represents a distinctly different gold trap. Mineralisation here is preferentially hosted within quartz-vein and stockwork arrays developed adjacent to the fold hinges of a BIF and chert package, reflecting a classic BIF structural trap where competency contrasts focused regional strain during folding. Key surface assay results from Cundy include:
- 1.19 g/t Au (GM003960)
- 0.96 g/t Au (GM003958)
Cundy also exhibits a distinct Au–Ag–As–Pb–Sb polymetallic geochemical signature, with assays returning up to 44.4 g/t Ag, 64.1 ppm As, 150 ppm Pb, and 8.34 ppm Sb (from samples GM003960 and GM003958, Table 1 in the announcement). Historical high-grade endmembers of up to 13.25 g/t Au have been recorded across the broader fold trend, underscoring the high-grade potential of local dilation shoots within the larger structural envelope.
At Mindoolah Main Reef (MMR), surface sampling has identified a newly recognised style of gold mineralisation. A 2–4m wide, chlorite-altered tholeiitic intrusive dyke returned 1.15 g/t Au (GM003989), with diagnostic geochemical enrichment in Nickel (218 ppm Ni), Chromium (1,245 ppm Cr), Iron (13.35% Fe), and Vanadium (319 ppm V). This mineralised corridor correlates directly with an untested ~100m-long aeromagnetic high anomaly over the MMR prospect, defining it as a priority target for upcoming RC drilling.
| Prospect | Target Style | Peak Au Result | Geochemical Signature | Drill Status |
|---|---|---|---|---|
| Bertram’s | Granite-hosted intrusive dyke and stockwork | 44.3 g/t Au | Au-dominant, Ag-poor | Targeting Phase 2 RC |
| Le Soleil | NE–SW shear corridors at BIF contact | 16.95 g/t Au | Au-dominant, Ag-poor | Targeting Phase 2 RC |
| Excelsior | Granite-hosted intrusive dyke and stockwork | Historical grab samples (structural validation) | Au-dominant, Ag-poor | Priority Phase 2 RC target |
| Cundy | BIF-hosted structural trap | 1.19 g/t Au | Au–Ag–As–Pb–Sb polymetallic | Targeting Phase 2 RC |
| Mindoolah Main Reef | Mafic intrusive-hosted gold | 1.15 g/t Au | Ni–Cr–V enriched, high Fe | Priority Phase 2 RC target |
Understanding structural gold systems — why geology defines the drill case
At Mindoolah, KRR has now identified three distinct gold trap mechanisms across the one project, each supported by surface assay validation. That is precisely what justifies moving to the drill phase.
Phase 2 RC program locked in — what comes next
The Phase 2 Reverse Circulation (RC) drill program is scheduled to commence in early October 2026, targeting down-dip and along-strike extensions of mineralised corridors beneath the shallow historical pit floors.
Before drilling commences, Phase 1 stockpile drill assays remain pending. These are being analysed by PhotonAssay™, the company’s preferred method for the stockpile material given the coarse, nuggety nature of gold mineralisation at Mindoolah. Those results will represent the next key dataset ahead of the Phase 2 program.
The exploration milestone sequence as outlined in the announcement is:
- Heritage survey with the Wajarri Yamaji People — completed
- Phase 1 maiden drill programme — completed (assays pending via PhotonAssay™)
- Phase 2 RC drill programme — scheduled early October 2026
Separately from the exploration program, KRR sold 13 million ordinary shares in Tivan Ltd (ASX: TVN) during August 2026, generating net sale proceeds of $3,290,089. This provides relevant cash context ahead of the upcoming drill campaign.
Graham Gadsby, Managing Director
“These mapping and geochemical results significantly sharpen our understanding of the Mindoolah Gold System… With high-resolution geophysics, detailed mapping and multi-element geochemistry now integrated, we have established a strong pipeline of drill-ready targets ahead of the Phase 2 RC program in early October.”
Multiple high-grade surface-validated targets, geophysical support from high-resolution aeromagnetics, a defined structural model across three distinct gold trap styles, and heritage approval secured — the pre-conditions for a drill-ready program are now in place at Mindoolah.
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About King River Resources
King River Resources (ASX: KRR) is a Western Australian gold explorer focused on the Mindoolah Gold Project, a historically mined high-grade gold project located approximately 70km north-west of Cue in the Murchison Province. The company is advancing the project toward Phase 2 RC drilling, targeting structural gold mineralisation across five prospects within the Mindoolah Mining Centre.
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