GBM Resources Hits 18m at 12g/t Gold Outside Twin Hills Resource Boundary
Key Takeaways
- The standout intercept from hole TNDH048 — 18m at 12.01g/t Au including 2m at 104.61g/t Au — sits entirely outside the current 309 Deposit MRE boundary, confirming genuine resource growth potential rather than infill confirmation.
- Lone Sister's LSDH011 returned a broad 37m at 2.40g/t Au from 285m with multiple high-grade internal zones up to 16.65g/t, also outside the current MRE, in the same area as the previously reported 52m at 2.77g/t Au result.
- Approximately 2,150m of pending assays at 309 and 1,400m at Lone Sister remain outstanding, representing a pipeline of near-term news flow catalysts before the planned Twin Hills MRE update.
- GBM's 50,000m Stage 2 program is explicitly designed to expand mineralisation beyond existing resource boundaries and grow the Twin Hills 1.0 Moz gold resource, which sits within a total Drummond Basin portfolio of 1.84 Moz Au.
- All intercepts are reported as downhole lengths with true widths unknown — a material caveat for assessing the volumetric significance of results in this narrow-vein epithermal system.
High-grade gold extends beyond Twin Hills resource boundaries
GBM Resources (ASX: GBM) has released further assay results from its ongoing 50,000m Stage 2 drilling program at the Twin Hills Gold Project in Queensland’s Drummond Basin, and the headline numbers are hard to ignore. Significant mineralisation has now been intersected outside the current mineral resource estimate (MRE) boundaries at both the 309 and Lone Sister deposits, making this a resource growth story rather than routine drilling progress.
The standout result comes from hole TNDH048 at the 309 Deposit: 18m @ 12.01g/t Au from 247m, including a stunning 2m @ 104.61g/t Au from 247m, all sitting outside the current MRE. That intersection lies approximately 85m from the previously reported TNDH012 result of 37m @ 5.00g/t Au, flagging the area as a priority target for follow-up drilling. With assays still pending for approximately 2,150m at 309 and 1,400m at Lone Sister, further results are expected to be incorporated into models ahead of the planned MRE update.
Headline intercepts from this announcement:
- 18m @ 12.01g/t Au from 247m (TNDH048), incl. 2m @ 104.61g/t Au from 247m — 309 Deposit, outside MRE
- 5m @ 6.66g/t Au from 189m (TNDH048), incl. 2m @ 16.20g/t Au — 309 Deposit, outside MRE
- 5m @ 5.80g/t Au from 118m (TNDH050), incl. 3m @ 9.44g/t Au — 309 Deposit, outside MRE
- 37m @ 2.40g/t Au from 285m (LSDH011), incl. 4m @ 7.77g/t Au from 314m — Lone Sister, outside MRE
CEO Daniel Hastings
“These results continue to strengthen the case for resource growth at 309 and Lone Sister. The outstanding result at 309 roughly 85m from the previously reported 37m @ 5.00g/t Au, identifies a priority area for followup drilling to test the extent and continuity of the mineralisation beyond the current resource…”
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What’s driving results at 309 and Lone Sister
Both deposits are producing compelling results for geological reasons that are worth understanding. The core point is this: when drilling intersects gold outside the current MRE boundary, it signals the deposit may be larger than currently modelled. More mineralisation outside the MRE means potential for the next resource update to capture a larger inventory. That is what resource growth looks like in practice.
309 Deposit — a high-grade system with room to grow
The 309 Deposit hosts a stockwork of very high-grade, generally narrow, low sulphidation epithermal quartz-sulphide veins and breccia fill. The Milled Matrix Breccia (BXM) is the key host to gold mineralisation, and previous drilling has demonstrated it extends well beyond the existing resource. The growing body of Stage 2 results is helping to refine the relationship between the BXM, structural controls, and higher-grade mineralisation across the deposit.
The Twin Hills gold discovery has now demonstrated lateral continuity well beyond the original resource footprint, with the BXM host unit traced across multiple drilling campaigns as the primary control on high-grade mineralisation.
The full suite of significant 309 results from this round, all outside the current MRE:
- 18m @ 12.01g/t Au from 247m (TNDH048), incl. 2m @ 104.61g/t Au
- 5m @ 6.66g/t Au from 189m (TNDH048), incl. 2m @ 16.20g/t Au
- 5m @ 5.80g/t Au from 118m (TNDH050), incl. 3m @ 9.44g/t Au
- 21m @ 1.29g/t Au from 221m (TNDH021), incl. 3m @ 2.35g/t Au
- 10m @ 1.26g/t Au from 327m (TNDH040), incl. 1m @ 9.18g/t Au
- 22m @ 0.78g/t Au from 277m (TNDH063), incl. 1m @ 8.68g/t Au
Collectively, these results broaden the drilling dataset beyond the current 309 resource and provide additional information on grade distribution and mineralisation continuity ahead of the next MRE update.
Lone Sister — broad mineralised intervals confirm resource growth potential
At Lone Sister, gold mineralisation is hosted in altered rhyolite and associated breccias and structures. Hole LSDH011 returned a broad intersection of 37m @ 2.40g/t Au from 285m, with multiple high-grade internal zones:
- 2m @ 6.75g/t Au from 286m
- 1m @ 16.65g/t Au from 302m
- 1m @ 9.53g/t Au from 308m
- 4m @ 7.77g/t Au from 314m
The hole also returned a second broad mineralised interval of 18m @ 1.40g/t Au from 328m, including 8m @ 2.43g/t Au from 338m.
This intersection lies outside the current Lone Sister MRE in the same area as the previously reported 52m @ 2.77g/t Au from 299m in LSDH002. The combination of broad mineralised intervals and multiple high-grade internal zones adds further drilling density in this area and provides additional information for assessing lateral and down-plunge extensions to the mineralised system.
A mineral resource estimate (MRE) is a modelled volume of rock containing gold at grades and quantities that may have reasonable prospects for eventual economic extraction. The MRE boundary defines what has been captured in that model. When drilling intersects gold beyond that boundary, it means mineralisation exists that is not yet counted in the resource — and the next MRE update has the potential to incorporate it, increasing the total resource inventory.
Key results at a glance
| Deposit | Hole ID | From (m) | Interval (m) | Grade (g/t Au) |
|---|---|---|---|---|
| 309 | TNDH048 | 247 | 18m | 12.01 |
| 309 | TNDH048 | 247 | 2m (incl.) | 104.61 |
| 309 | TNDH048 | 189 | 5m | 6.66 |
| 309 | TNDH050 | 118 | 5m | 5.80 |
| 309 | TNDH021 | 221 | 21m | 1.29 |
| Lone Sister | LSDH011 | 285 | 37m | 2.40 |
| Lone Sister | LSDH011 | 328 | 18m | 1.40 |
All intercepts are downhole lengths; true widths are not known.
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What comes next — MRE update and drilling pipeline
The immediate pipeline is well stocked with near-term news flow. Assays are pending for approximately 2,150m of drilling at 309 and 1,400m at Lone Sister. As those results arrive, they will be incorporated into geological and mineralisation models ahead of the planned Twin Hills MRE update.
GBM’s four stated key objectives for the Stage 2 program are:
- Improve confidence and high-grade continuity within the existing Twin Hills MRE
- Expand mineralisation around existing resource boundaries
- Refine geological and structural controls on higher-grade gold mineralisation
- Provide geological, metallurgical and geotechnical information required to support future project studies
For context on scale, GBM holds approximately 1.84 Moz Au across its Drummond Basin portfolio, spanning Twin Hills, Yandan and Mt Coolon. Twin Hills alone carries a 1.0 Moz gold resource, and the current Stage 2 program is specifically designed to grow that number.
For investors, the practical implication is straightforward. Multiple pending assay batches from two deposits mean a series of near-term news flow catalysts before the resource update lands. Each batch has the potential to add to the picture of mineralisation extending beyond current boundaries, exactly as this announcement has done at both 309 and Lone Sister.
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