Regis Resources Extends Rosemont Gold System 600m South With Mine Life Growth in Sight
Key Takeaways
- Resource development drilling at Rosemont Underground has extended the gold mineralised system 600m south of the current Stage 3 Resource envelope, with mineralisation confirmed open along strike and down-dip.
- Seven significant intercepts were returned from four diamond core holes, with the headline result of 1.6m at 8.8 g/t Au from 712.4m depth in hole RRLRMDD188W1.
- The newly confirmed growth segment is 600m long and 20–30m thick, structurally controlled within the quartz dolerite host unit that defines the Rosemont system.
- Infill drilling is currently underway to link the new southern results to the existing Stage 3 Resource, with no resource upgrade stated or implied at this stage.
- A broader exploration update covering Duketon, Tropicana, and McPhillamys is anticipated in Q2 FY27, which will incorporate these results.
Rosemont drilling opens new growth corridor at Duketon
Regis Resources (ASX: RRL) has announced that resource development drilling at its Rosemont Underground operation has extended the known gold mineralised system 600m south of the current Stage 3 Resource envelope, with mineralisation remaining open along strike and down-dip. The results, from the company’s 100%-owned Duketon Gold Operations in Western Australia, add meaningful optionality to the underground mine life without yet constituting a resource upgrade.
This is targeted drill-out of a known gold system, not speculative greenfields exploration, and management has framed it as a further step in Rosemont’s established track record of replacing and extending mineralisation ahead of depletion.
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Q1 FY27 drilling results: what the numbers show
Seven significant intercepts have been returned from four diamond core holes drilled down-plunge and to the south of the Rosemont Stage 3 development. The headline result is 1.6m @ 8.8 g/t Au from 712.4m in hole RRLRMDD188W1, with several other intervals confirming grade continuity across the newly tested segment.
All widths below are reported as down-hole widths. True widths are estimated to be between 66% and 100% of the reported down-hole widths.
| Hole ID | From (m) | To (m) | Interval (m) | Au (g/t) |
|---|---|---|---|---|
| RRLRMDD182W2 | 920.0 | 921.0 | 1.0 | 4.4 |
| RRLRMDD182W4 | 801.0 | 802.0 | 1.0 | 2.8 |
| RRLRMDD182W4 | 844.0 | 845.0 | 1.0 | 2.2 |
| RRLRMDD188 | 734.0 | 737.4 | 3.4 | 2.4 |
| RRLRMDD188 | 740.0 | 740.5 | 0.5 | 2.6 |
| RRLRMDD188W1 | 690.0 | 693.3 | 3.3 | 3.7 |
| RRLRMDD188W1 | 712.4 | 714.0 | 1.6 | 8.8 |
Geologically, the intersections occur as narrow higher-grade quartz veins within a broader halo of lower-grade sulphide-dominated mineralisation, which is described in the announcement as typical of the Rosemont gold system. The drilling has confirmed an additional 600m-long, 20–30m-thick, structurally controlled and mineralised segment of the quartz dolerite host unit.
CEO quote
Jim Beyer, Managing Director and CEO
“These results are very encouraging and reinforce our long-held confidence in the underground growth potential at Rosemont, the first underground mine established at Duketon. The latest drilling has extended our geological understanding of the mineralised system down-plunge and to the south of the current Stage 3 development, with mineralisation remaining open, a strong indication of the opportunity to grow Mineral Resources in these newly tested areas over time.
“Rosemont has a consistent track record of replacing and extending mineralisation ahead of depletion, and these results give us further confidence in the potential to extend the underground mine life as we systematically progress this drilling campaign. This is exactly the kind of disciplined, geology-led exploration that continues to underpin our long-term underground growth pipeline across Duketon.”
Understanding underground resource development drilling
Not all drilling is created equal, and the distinction matters when you are assessing what these results mean. Resource development drilling targets a known, established mineralised system to better define its boundaries and potentially expand the resource estimate. It is not speculative greenfields work where a company is searching for a system from scratch. At Rosemont, geologists already understand the orientation and character of the mineralised unit; these holes are designed to test how far it extends.
When mineralisation is described as remaining “open along strike and down-dip,” that signals the known system has not been closed off at its edges. In practical terms, it means further drilling has a reasonable geological basis to add to the resource envelope rather than simply confirming existing boundaries.
For investors, that distinction matters because mine life extension in an operating underground mine reduces the need for costly new project development. A longer mine life supports more predictable production visibility, which is typically reflected in how the market values a producing operation. Management has explicitly pointed to Rosemont’s track record of replacing and extending mineralisation ahead of depletion as the context for these results.
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What comes next for Rosemont and Duketon
The announcement outlines a clear sequence of near-term activity at Rosemont:
- Infill diamond core drilling is currently in progress to link these new results to the existing Stage 3 Resource
- Further drilling will continue to define the full dimensions of this newly confirmed growth segment
- Results are expected to be incorporated into a broader exploration update across Duketon, Tropicana, and McPhillamys, anticipated to be published during Q2 FY27
The broad drill spacing completed to date in this southern segment is the reason mineralisation remains open along strike and down-dip, and provides the rationale for the ongoing infill programme. The announcement is explicit that continued drilling is required to quantify the growth opportunity; no resource upgrade has been stated or implied at this stage.
Regis Resources financial health and production profile provide the broader context in which Rosemont’s mine life extension work matters most; a longer underground runway at Duketon directly supports the company’s ability to sustain gold output without relying on costly new project development.
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