GBM Resources Hits 101m at 2.63g/t Gold Pointing to Grade Upgrade at Twin Hills
Key Takeaways
- Hole LSDH020 at Lone Sister returned 101m @ 2.63g/t Au from 256m — more than double the current Twin Hills MRE average grade of 1.3g/t Au across 23.1Mt for 1.0Moz.
- A substantial portion of the 101m interval was drilled through a zone the existing block model currently classifies at lower grades, giving the upcoming resource update a credible basis for a higher average grade, not just more ounces.
- High-grade pulses within the interval — including 4m @ 10.35g/t Au from 332m — indicate structured mineralisation rather than erratic high-grade spikes.
- At the 309 deposit, drilling is simultaneously confirming high grades within the existing MRE boundary (12m @ 5.94g/t Au; 10m @ 4.93g/t Au) and intersecting mineralisation outside it, supporting both quality improvement and resource growth in the same update.
- With 8,400m of assay results still pending and samples being expedited, the dataset feeding the planned December quarter MRE update continues to expand materially.
Twin Hills drilling delivers 101m at 2.63g/t gold, setting up resource upgrade
GBM Resources (ASX: GBM) has reported a standout intercept from its ongoing 50,000m Stage 2 drilling programme at the Twin Hills Gold Project in Queensland’s Drummond Basin: 101m @ 2.63g/t Au from 256m in hole LSDH020 at the Lone Sister deposit. That result sits materially above the current Mineral Resource Estimate (MRE) grade, which stands at 23.1Mt @ 1.3g/t for 1.0Moz Au (comprising 0.48Moz Au at Lone Sister and 0.52Moz Au at 309).
The significance here is not just the width of the intercept. A substantial portion of the 101m interval was drilled through a zone currently modelled at lower grades within the MRE, which means the upcoming resource update has a credible basis for a higher average grade, not simply more ounces. High-grade subsets within the interval reinforce this: 9m @ 6.55g/t Au from 258m and 4m @ 10.35g/t Au from 332m.
With 8,400m of assay results still pending, the dataset underpinning the planned December quarter MRE update continues to grow.
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Q1 FY27 drilling highlights — what the assays show across Lone Sister and 309
The latest batch of results covers both Twin Hills deposits, with in-resource confirmation and step-out extensions reported simultaneously at 309.
Lone Sister — grade materially above current model
LSDH020 is a north-south oriented hole targeting an area with limited historical drilling density. The MRE currently models a substantial portion of the intersected zone at lower grades, making the 101m @ 2.63g/t result a direct challenge to the existing block model in that area. The high-grade pulses through the interval — including 4m @ 10.35g/t near the base — indicate the mineralisation is structured, not erratic.
All intercepts are reported as downhole lengths and true widths are not known.
309 — high-grade confirmation and resource extensions
At 309, the programme is delivering on two fronts simultaneously: confirming high grades within the existing MRE boundary and intersecting mineralisation outside it, supporting the case for resource growth.
Key in-resource results at 309 include:
- TNDH048 (in MRE): 12m @ 5.94g/t Au from 112m, including 6m @ 11.15g/t Au from 113m
- TNDH053 (in MRE): 10m @ 4.93g/t Au from 207m, including 4m @ 10.37g/t Au from 212m; and 16m @ 2.23g/t Au from 241m, including 9m @ 3.53g/t Au from 245m
Step-out results outside the current 309 MRE include:
- TNDH042: 8m @ 1.19g/t Au from 247m and 27m @ 1.28g/t Au from 275m
- TNDH049: 22m @ 1.29g/t Au from 142m, including 4m @ 2.34g/t Au from 147m
- TNDH036: 7m @ 1.14g/t Au from 292m
| Hole ID | Deposit | From (m) | Interval (m) | Grade (g/t Au) |
|---|---|---|---|---|
| LSDH020 | Lone Sister | 256 | 101 | 2.63 |
| LSDH020 (incl.) | Lone Sister | 258 | 9 | 6.55 |
| LSDH020 (incl.) | Lone Sister | 332 | 4 | 10.35 |
| TNDH048 (in MRE) | 309 | 112 | 12 | 5.94 |
| TNDH048 (incl.) | 309 | 113 | 6 | 11.15 |
| TNDH053 (in MRE) | 309 | 207 | 10 | 4.93 |
| TNDH053 (incl.) | 309 | 212 | 4 | 10.37 |
| TNDH053 (in MRE) | 309 | 241 | 16 | 2.23 |
| TNDH042 (outside MRE) | 309 | 247 | 8 | 1.19 |
| TNDH042 (outside MRE) | 309 | 275 | 27 | 1.28 |
| TNDH049 (outside MRE) | 309 | 142 | 22 | 1.29 |
| TNDH036 (outside MRE) | 309 | 292 | 7 | 1.14 |
The pending assay pipeline is substantial and is being expedited ahead of the planned MRE update:
- 8,400m of assay results remain pending in total
- 6,450m still outstanding at 309
- 1,950m still outstanding at Lone Sister
- Outstanding samples are being expedited ahead of the planned MRE update
What is a Mineral Resource Estimate — and why does grade matter?
A Mineral Resource Estimate (MRE) is a JORC-compliant calculation of how much mineralised material exists within a defined area, reported as tonnes and grade. Grade is expressed in grams of gold per tonne of rock (g/t Au) — the higher this number, the more gold is extracted from every tonne processed, which directly affects how economic a project is to develop.
GBM’s current Twin Hills MRE averages 1.3g/t Au across 23.1Mt. When a drill hole returns 101m @ 2.63g/t through a zone the model has pegged at lower grades, it is a direct signal that the model may be understating gold content in that area. A future MRE revision incorporating these results could carry a higher average grade, not just a larger tonnage, which matters more to project economics.
It is also worth understanding what the programme is doing on two tracks simultaneously. In-resource drilling confirms and potentially upgrades what is already classified in the MRE, improving confidence and block model accuracy. Step-out drilling tests ground beyond the current resource boundary to expand the overall mineralised footprint. GBM is running both tracks at once, meaning the next MRE update could reflect improvement in both quality and size.
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Path to resource update and what investors should watch
The company has stated its objective of advancing Twin Hills towards its next MRE update in the December quarter. The programme’s four stated objectives are:
- Improve confidence and continuity within the existing Twin Hills MRE
- Expand mineralisation around the existing resource boundaries
- Refine the geological and structural controls on higher-grade gold mineralisation
- Provide the geological, metallurgical and geotechnical information required to support future project studies
At 309, the programme has also reinforced the geological significance of the Milled Matrix Breccia (BXM) as the principal host to much of the gold mineralisation. GBM’s evolving interpretation of the BXM has expanded its prospective footprint beyond the current 309 resource boundary and sharpened drill targeting across the broader Twin Hills corridor.
GBM’s evolving interpretation of the BXM is also reshaping the project’s physical footprint: the Twin Hills discovery extends 700 metres south of the existing resource boundary, materially expanding the corridor available for future drill targeting.
Daniel Hastings, Chief Executive Officer
“The 101m @ 2.63g/t Au intersection at Lone Sister is particularly encouraging, with a substantial portion of the interval returning grades materially above the current resource model…we see good potential for the Stage 2 program to deliver both increased confidence and growth as we progress towards the next Twin Hills Mineral Resource update.”
For broader context on GBM’s asset base, the company holds approximately ~1.84Moz Au in mineral resources across its Drummond Basin portfolio, which encompasses Twin Hills, Yandan, and Mt Coolon. Twin Hills, with its ~1.0Moz MRE, is the flagship project within that broader resource base.
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