GBM Resources has reported significant extensions and grade improvements at its Twin Hills Gold Project, with Stage 2 drilling revealing mineralisation beyond the existing 1.0Moz resource and identifying over 20 new exploration targets.
- Stage 2 drilling extends mineralisation beyond 1.0Moz resource
- High-grade intersections at 309 and Lone Sister deposits
- Approximately 23,000m drilled with 12,000m assays pending
- Enhanced geological model improves targeting and resource confidence
- Regional exploration initiated with over 20 new priority targets
Stage 2 Drilling Expands Twin Hills Gold Resource
GBM Resources (ASX:GBM) has delivered a robust update from its Stage 2 drilling campaign at the Twin Hills Gold Project in Queensland, confirming both resource extensions and grade uplift beyond the existing 1.0 million ounce (Moz) Mineral Resource Estimate (MRE). With approximately 23,000 metres drilled so far, nearly half of the planned 50,000 metres, the company recorded multiple significant high-grade intercepts at its 309 and Lone Sister deposits, underscoring potential for further growth.
Key assay highlights include a standout 45 metres at 2.21 grams per tonne (g/t) gold from 346 metres at the 309 deposit, featuring a 5-metre interval at 8.96 g/t and a 1-metre bonanza grade of 28.75 g/t. Lone Sister also delivered promising results such as 35 metres at 1.76 g/t from 307 metres, including 11 metres at 4.10 g/t. Notably, broad zones of mineralisation were intersected more than 75 metres beyond the current resource boundary, pointing to lateral extensions that could materially add to the resource base.
Refined Geological Model Boosts Confidence and Targeting
The drilling program has significantly advanced GBM's geological understanding of the Twin Hills system. The company confirmed the lateral continuity of a key milled matrix breccia (BXM) unit that hosts most of the gold mineralisation at 309, extending beneath adjacent prospects and demonstrating a much larger footprint than previously recognised. This breccia was emplaced violently along water-saturated sedimentary horizons during a rhyolitic volcanic event, providing a compelling structural control on mineralisation.
Additionally, a high-grade supergene horizon about 100 metres below surface at 309 was identified, likely associated with structural dilation, which is expected to enhance resource continuity and metallurgical understanding. These insights have led GBM to optimise drill orientations, prioritising north-south holes to better intersect mineralised zones, and convert some diamond drilling to faster reverse circulation (RC) drilling to accelerate resource definition along strike.
Lone Sister Shows Encouraging Grade Uplift and Extensions
At Lone Sister, drilling results have exceeded expectations, despite many holes being designed as RC pre-collars for subsequent diamond tails. Intersections such as 48 metres at 0.91 g/t within the existing resource and 25 metres at 1.09 g/t outside the current MRE suggest both grade uplift and resource expansion potential. A significant 35-metre intercept at 1.76 g/t connects two high-grade zones, which could improve grade continuity and increase contained ounces.
The program includes diamond tails targeting deeper extensions, with ongoing assays expected to refine the geological model further. These results reinforce GBM's confidence in expanding the resource laterally and at depth, with an updated MRE anticipated in Q4 2026.
Regional Exploration Targets Set to Drive Discovery Pipeline
Beyond resource drilling, GBM is advancing a regional exploration program informed by enhanced geological and geophysical models. The company has identified more than 20 priority drill-ready targets across the Twin Hills corridor, many of which were overlooked by historical shallow drilling. One rig has been redeployed to scout these targets over the next two months, aiming to uncover new deposits within the district.
GBM's approach leverages geochemical pathfinders such as arsenic and antimony, alongside elevated uranium and rare earth elements associated with fertile rhyolitic magmatic sources, to vector towards prospective zones. Recent magnetic and radiometric surveys, coupled with planned airborne electromagnetic (EM) surveys partially funded by a $250,000 Queensland Government grant, will further sharpen target generation.
Looking Ahead: Continued Assays and Resource Update
With approximately 12,000 metres of assay results outstanding, GBM anticipates a steady flow of exploration news and resource updates in the coming months. The company’s objectives remain focused on expanding the MRE both near surface and at depth, confirming high-grade continuity, and de-risking the project through metallurgical and geotechnical studies. The enhanced geological model and discovery of a supergene horizon will feed into the next resource estimation scheduled for late 2026.
GBM’s Twin Hills project, part of a broader Drummond Basin portfolio containing nearly 1.84 Moz of gold resources, continues to demonstrate the hallmarks of a district-scale mineralised system with substantial upside potential.
Bottom Line?
GBM’s Stage 2 drilling is reshaping the Twin Hills resource story, but pending assays and geological modelling will be critical to translating promising intercepts into ounces.
Questions in the middle?
- How will the pending 12,000 metres of assay results influence the upcoming Mineral Resource Estimate?
- Can the newly identified supergene horizon at 309 improve metallurgical recoveries and project economics?
- Will the regional exploration program uncover new deposits that materially increase district-scale resources?