Highlights

  • Ramelius Resources released a Dalgaranga exploration update confirming exceptional drilling results from Gilbey's Underground (West Winds and Four Pillars) including 3.9m at 21.2g/t Au from 219.0m, 6.1m at 10.4g/t Au from 207.7m, and 7.5m at 5.11g/t Au from 271.1m, supporting Gilbey's Underground total Mineral Resources of 6.9Mt at 1.9g/t for 380,000oz.
  • The drilling results are targeting displacement of low-grade mill feed scheduled for FY29 (1.9Mt at 0.8g/t) and FY30 (1.8Mt at 0.6g/t) by establishing Gilbey's Underground as an additional mine alongside the existing Never Never Underground, presenting an upside opportunity to exceed targeted group production of 525koz per annum (midpoint) by FY30.
  • RMS shares eased AUD 0.120 (3.000%) to AUD 3.880 on volume of 844,057 and a market cap of AUD 7.59 billion on 22 April 2026, with the modest pullback appearing to reflect profit-taking or broader sector-level selling rather than any adverse news from the exploration update.

Ramelius Resources (ASX:RMS) shares fell AUD 0.120, or 3.000%, to AUD 3.880 during morning trading on 22 April 2026, on volume of 844,057 shares with a bid-offer spread of AUD 3.870 to AUD 3.880 and a market capitalisation of AUD 7.59 billion. The 3% decline on the day of a positive exploration update announcement creates an analytical tension that experienced investors in the gold sector will be familiar with — the market's response to exploration news is not always synchronised with the news content itself, and broader gold sector sentiment, profit-taking after recent price appreciation, and general market conditions can weigh on individual stocks independent of company-specific disclosures.

Gilbey's Underground: West Winds and Four Pillars Results

The Dalgaranga exploration update focused on two areas at Gilbey's Underground: the West Winds and Four Pillars zones. The drilling results from these areas confirm high-grade, consistent mineralisation at depth, with the standout intercepts being 3.9m at 21.2g/t Au from 219.0m, 6.1m at 10.4g/t Au from 207.7m, 7.5m at 5.11g/t Au from 271.1m, 7.7m at 5.94g/t Au from 253.0m, and 11.9m at 2.83g/t Au from 230.6m. Ramelius' Executive General Manager Exploration, Peter Ruzicka, described these early results as enhancing confidence that Gilbey's Underground has the potential to become the next underground mine at Dalgaranga.

Gilbey's Underground currently carries total Mineral Resources of 6.9Mt at 1.9g/t for 380,000oz. Beyond this, Ramelius has generated a non-reportable, unclassified estimation over an Exploration Target area with a conceptual range of 2.1–4.7Mt at 1.5–2.0g/t for 100,000–300,000oz. The company cautions that the Exploration Target is conceptual in nature and there is insufficient exploration to estimate a Mineral Resource — but the directional scale of the target indicates meaningful resource growth potential if subsequent drilling supports it.

Strategic Rationale: Displacing Low-Grade Mill Feed

The strategic logic of Gilbey's Underground development is clearly articulated in the announcement. Ramelius' existing mine plan includes relatively low-grade Dalgaranga mill feed of 1.9Mt at 0.8g/t in FY29 and 1.8Mt at 0.6g/t in FY30. By establishing Gilbey's Underground as an operating mine by those years, the company could replace this low-grade material with higher-grade underground ore, improving the blended feed grade, lowering unit processing costs, and potentially exceeding the targeted 525koz group production per annum (midpoint) by FY30. This outcome would represent a positive revision to Ramelius' long-term production outlook without requiring additional greenfields exploration or new infrastructure.

Plymouth-Sly Fox: Surface Targeting Results

The update also disclosed results from surface targeting at the Plymouth-Sly Fox area, which is currently not included in the mine plan. Significant intercepts include 16.5m at 2.45g/t Au from 438.5m, 0.6m at 24.3g/t Au from 307.5m, and 3.3m at 5.43g/t Au from 256.7m. The objective at Plymouth-Sly Fox is to prove up an open pit cutback and potentially a third branch of underground mining, which would provide additional upside opportunity by incorporating higher-grade material into the mill feed schedule beyond the current plan. Plymouth-Sly Fox remains a near-term exploration opportunity that could add incremental resources to the broader Dalgaranga system.

Conclusion

Ramelius Resources' 3.000% session decline to AUD 3.880 on 844,057 shares and a market cap of AUD 7.59 billion on 22 April 2026 sits against the context of a constructive exploration update at Dalgaranga — high-grade Gilbey's Underground intercepts of 3.9m at 21.2g/t Au, a conceptual Exploration Target of up to 300,000oz, and Plymouth-Sly Fox surface results — that builds the case for Gilbey's becoming the next Dalgaranga underground mine. The strategic opportunity to displace low-grade FY29–FY30 mill feed and exceed the 525koz group production target by FY30 is the core near-to-medium term upside narrative for investors tracking RMS.