Pilbara Gold Extends Mt York Gold Corridor 100m Deeper, Targeting Resource Growth
Key Takeaways
- Pilbara Gold's latest Mt York drilling has confirmed gold mineralisation approximately 100m below the current Mineral Resource shell at Main Hill, with hole 26MYRCD007 returning 22m @ 1.29g/t Au from 321m and 9m @ 2.11g/t Au from 416m — a direct signal that the resource model is undersizing the system.
- High-grade intercepts including 5m @ 7.91g/t Au and 5m @ 6.53g/t Au at Main Hill demonstrate that the BIF corridor hosts both bulk-tonnage zones and high-grade shoots, supporting dual-driver economics for a future open-cut operation.
- Breccia Hill infill drilling returned results strongly correlating with historical data, providing the confidence needed to upgrade Inferred material to Indicated classification ahead of the next MRE update.
- The 60,000m drill programme is now 60% complete at 36,600m drilled, with PFS infill drilling on track for October 2026 completion and an updated MRE plus maiden Reserve Estimation targeted for Q1 CY2027 alongside the PFS in H1 CY2027.
- An Airborne Electro-Magnetic survey covering 280km² of BIF south of Mt York commenced this week, targeting a potential new discovery over PGL-controlled licences — adding a greenfields exploration catalyst to an already active programme.
Wide, high-grade hits keep extending Mt York’s 4.2km gold corridor
Pilbara Gold (ASX: PGL) is methodically building a substantial case at its 2.1Moz BIF-hosted Mt York Gold Project in Western Australia’s Pilbara, with the latest drilling results demonstrating that the system extends deeper than the current resource model captures. The company has now completed 36,600m of a planned +60,000m drill programme (60% complete), with this release delivering significant results from the Main Hill and Breccia Hill prospects. PFS infill drilling is on track for completion in October 2026, with an updated Mineral Resource Estimate (MRE) and maiden Reserve Estimation targeted for early 2027 alongside the Prefeasibility Study (PFS) targeted for H1 CY2027.
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September 2026 drilling results — Main Hill and Breccia Hill deliver
The latest assays from Mt York confirm grade, width, and depth across both key prospects, reinforcing the resource growth potential ahead of the next MRE update.
Main Hill — high-grade and deep
Main Hill continues to deliver results across a range of styles, from high-grade near-surface hits to wide bulk-tonnage intercepts and, critically, mineralisation confirmed approximately 100m below the current resource shell:
- 5m @ 7.91g/t Au from 29m incl. 2m @ 15.65g/t Au from 32m (26MYRC025)
- 5m @ 6.53g/t Au from 265m incl. 1m @ 10.77g/t Au from 266m (26MYRCD005)
- 12m @ 3.65g/t Au from 105m (25MYDD071)
- 13m @ 3.13g/t Au from 297m incl. 4m @ 8.37g/t Au from 306m (26MYRCD002B)
- 22m @ 1.29g/t Au from 321m AND 9m @ 2.11g/t Au from 416m (26MYRCD007) — the depth significance result, intersecting multiple mineralised zones approximately 100m below the current Mineral Resource
- 48m @ 0.78g/t Au from 252m (26MYRCD003) and 67m @ 0.43g/t Au from 89m (26MYRCD040) — wide, bulk-tonnage zones supporting conversion of Inferred mineral resources to Indicated
Mineralisation at Main Hill remains open at depth, which is the key signal here for resource growth potential.
Breccia Hill — infill confirms historical data reliability
The Breccia Hill RC infill programme was designed as a confidence exercise: validating the legacy dataset and supporting a resource classification upgrade to Indicated ahead of the MRE update. The results delivered:
- 17m @ 3.21g/t Au from 349m incl. 4m @ 9.51g/t Au from 358m (26MYRCD012)
- 18m @ 2.70g/t Au from 65m incl. 3m @ 7.06g/t Au from 72m (26MYRC052)
- 31m @ 1.91g/t Au from 25m incl. 3m @ 10.91g/t Au from 48m (26MYRC066)
- 41m @ 1.24g/t Au from 36m incl. 9m @ 3.10g/t Au from 67m (26MYRC056)
The announcement states that results demonstrate “strong correlation with historical drilling,” providing increased confidence in the reliability of the legacy dataset and the existing Indicated classification. This is a resource confidence upgrade, not a new discovery.
Key Intercepts Summary
| Prospect | Hole ID | From (m) | Interval (m) | Grade (g/t Au) |
|---|---|---|---|---|
| Main Hill | 26MYRC025 | 29 | 5 | 7.91 |
| Main Hill | 26MYRCD005 | 265 | 5 | 6.53 |
| Main Hill | 25MYDD071 | 105 | 12 | 3.65 |
| Main Hill | 26MYRCD002B | 297 | 13 | 3.13 |
| Main Hill | 26MYRCD007 | 321 | 22 | 1.29 |
| Main Hill | 26MYRCD040 | 89 | 67 | 0.43 |
| Breccia Hill | 26MYRCD012 | 349 | 17 | 3.21 |
| Breccia Hill | 26MYRC066 | 25 | 31 | 1.91 |
Intervals reported as downhole lengths. True widths are included in Appendix 1 of the source announcement. Results aggregated using a 0.3g/t Au minimum cut-off grade.
What is BIF-hosted gold and why does it matter for Mt York’s scale?
Banded Iron Formation (BIF) is an ancient sedimentary rock type that acts as a structural trap for gold-bearing fluids in orogenic systems, where heat and pressure drive gold-rich fluids through the crust over geological time.
What makes BIF deposits particularly valuable is their continuity. Gold tends to be distributed across wide, predictable horizons rather than confined to narrow, erratic veins. That predictability supports bulk open-cut mining economics, where you process large volumes of material efficiently rather than chasing high-grade shoots underground.
The Pilbara’s Archaean craton is one of the world’s oldest gold-bearing geological terrains, and BIF-hosted deposits in this region have a strong historical track record. Mt York’s BIF runs continuously for 4.2km, and that strike length is the structural foundation underpinning both the 2.1Moz resource and the growth potential PGL is pursuing with deeper drilling.
This context matters when reading the wide intercepts from Main Hill. A 67m or 48m intersection at lower grades is not a weak result in a BIF system; it is exactly the style of mineralisation that feeds large, low-cost open-cut operations. Those bulk zones, combined with the higher-grade shoots intersected in the same programme, represent the dual drivers of resource scale and economic grade.
What Dr Peter Turner said
Dr Peter Turner, Managing Director, Pilbara Gold Limited
“This is another set of excellent results from across our 4.2km long Mt York Gold Project that demonstrates wide zones of BIF-hosted gold. The 60,000m drilling program is now 60% complete and we will be transitioning the rigs to drill deeper (+100m deep) parts of Main Hill Extension (where we believe the BIF and mineralisation are thickening) and tracing the ‘Monster Zone’ to the northwest. Our Airborne Electro-Magnetic (AEM) survey will commence this week over 280km2 of BIF to the south of Mt York, targeting a new discovery over PGL-controlled licences.”
What comes next — milestones to watch
The path from here to a fully de-risked, PFS-grade project has several clear milestones, each designed to build confidence and demonstrate economic viability at scale:
- PFS infill drilling — on track for completion October 2026
- Deeper (+100m) extensional drilling at Main Hill Extension — commencing November 2026
- Airborne Electro-Magnetic (AEM) survey over 280km² of BIF south of Mt York — commencing this week, targeting a new discovery over PGL-controlled licences
- 12,000m drilling programme at Roe Hills Gold Project near Kalgoorlie — planned
- Updated MRE — targeted Q1 CY2027
- Mt York PFS — targeted H1 CY2027, to include maiden Reserve Estimation
The announcement notes that resources “are expected to grow further” as drilling continues, though this represents company guidance rather than a confirmed outcome. Each milestone on this list serves a specific purpose: converting Inferred material to Indicated, extending the resource shell at depth, and assembling the technical data package required for a credible PFS. Taken together, they represent a structured programme to move Mt York from a large exploration resource toward a defined, economically viable project.
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About Pilbara Gold and the Mt York project
Pilbara Gold Limited (ASX: PGL), formerly Kairos Minerals Limited, owns 100% of the Mt York Gold Project in the Pilbara region of Western Australia, a project partially mined by Lynas Gold NL between 1994 and 1998. The current MRE stands at 2.1Moz (61.7Mt @ 1.05g/t Au), comprising 42.1Mt Indicated @ 1.02g/t Au (1,380koz) and 19.7Mt Inferred @ 1.11g/t Au (703koz), using an A$5,500/oz pit shell and a 0.4g/t Au cut-off grade. The company also holds 100% of the Roe Hills Gold Project, located 120km east of Kalgoorlie in WA’s Eastern Goldfields.
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