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Drilling and Exploration Activities

Stunning High-Grade Results from RR Grade Control Drilling

A significant grade control drilling program was completed at RR in 2026 comprising 327 RC holes for 13,539m – key outcomes and high-grade results included:

*Cautionary Statement: assay results such as 3,650 g/t Au are indicative of nuggety gold, known to occur at Redcastle Reef deposit, and are typically cut to a lower value in Mineral Resource Estimation (ASX: RC1 30 June 2025)

Redcastle Reef 300m Extension

A broad spaced SHRC drilling program of 36 holes was completed and designed to test for gold mineralisation between RR and QA.

Significantly, four holes in the northern sector returned gold mineralisation including the high-grade hit of 1m @ 11.9 g/t Au from 20m in hole SHRC47. Results combined with historical data are interpreted to have identified ~300m extension of the RR mineralised system to the west of the currently defined RR MRE area.

RR West geological plan view over satellite imagery
RR-QA development area showing drillhole assays and 2025 MRE conceptual pit outlines

Redcastle Reef Diamond Drilling Results

The RR diamond drilling programme returned broad shallow mineralised intervals within the current 2025 MRE conceptual pit area. The standout results included:


  • 26RRDD002: 15m @ 1.94 g/t Au from 18m
  • 26RRDD003*: 23.13m @ 1.83 g/t Au from 21m, including a higher-grade interval of 14m @ 2.73 g/t Au from 21m, with a peak interval of 1m @ 29.0 g/t Au from 21m.Drill hole 26RRDD003 was deliberately drilled down the interpreted mineralised structure to test downdip continuity. The reported interval is a downhole length only. It does not represent a true width.

Drill hole 26RRDD003 was deliberately drilled down the interpreted mineralised structure to test downdip continuity. The reported interval is a downhole length only. It does not represent a true width.

Queen Alexandra Diamond Drilling Results

The QA diamond holes returned discrete but encouraging mineralised intervals within the planned development area, providing further support for the interpreted shear-hosted gold system as reported previously (Figure 7, ASX: RC1, 30 June 2025), and consistent with the interpreted lode projections.


  • 26QADD002: 2m @ 5.49 g/t Au from 21m (Kestrel Lode), including 0.5m @ 9.54 g/t Au from 21.5m; and 1.5m @ 1.49 g/t Au from 81.5m (Hawk Lode)
  • 26QADD001: 3m @ 1.87 g/t Au from 37m (Kestrel Lode), and 1m @ 2.13 g/t Au from 43m (Kestrel Lode splay)


Importantly, the diamond core provides direct geological observations of the QA shear system and supports the interpreted Kestrel and Hawk lode positions within the Company’s multi-lode, shear hosted gold model. The QA sections also show that the interpreted Kestrel and Hawk lode system extends beneath and beyond the current 2025 MRE conceptual pit shell, with the deeper Hawk Lode intercept in 26QADD002 supporting the potential for down-dip continuation of mineralisation below the current pit position.

These results reinforce QA not only as a key component of the planned RR– QA development area, but also as a mineralised system with potential extending beyond the limits of the presently contemplated open pit. Any deeper or down-dip extensions of the lode system will be assessed through ongoing geological interpretation, integration of grade-control data and future targeted drilling programmes.

Diamond Drilling Strengthens RR-QA and Highlights QA Upside

In the first half of 2026, Redcastle reported assay results from a five-hole diamond drilling programme completed at the RR and QA gold deposits. The programme was completed by BML Ventures Ltd on behalf of the RB JV and was designed to confirm geological and structural confidence within RC1’s principal development areas.

The programme followed completion of RR grade-control drilling and recent QA infill drilling and was intended to provide additional core-based geological and structural information to support mine planning, ore delineation and operational execution across the RR-QA development area.

The five-hole diamond drilling programme was completed across RR and QA to provide fresh core information that complements the completed RR grade-control dataset and recent QA drilling. The diamond core logging provided direct geological observations that improve understanding of mineralisation controls, alteration patterns and mineralised/waste boundary characteristics, supporting ore delineation, planned selective mining, ore spotting and future grade-control planning within the RB JV.

QA Grade Control Drilling

In late May, Redcastle completed the QA grade-control reverse circulation drilling programme at the Redcastle Gold Project.

The QA grade-control programme comprised a total of 8,810m drilled. The programme was designed to provide closer-spaced drilling information to support ore-waste delineation, grade-control modelling and near-term mine planning within the QA development area.

Redcastle has reported initial assay results from the 8,810m grade-control RC drilling programme at QA located approximately 700m west of RR. The initial results support shallow high-grade gold mineralisation within the interpreted Kestrel and Kestrel Hanging Wall lode positions across the QA development area and provide additional data to refine lode geometry, local grade distribution, ore-waste boundaries and mine scheduling.

Strategic significance of the QA grade-control results

QA is located approximately 700m west of Redcastle Reef, where mining activities are underway. The initial QA grade-control assays support the presence of shallow mineralisation across multiple holes and sections, reinforcing QA as part of Redcastle’s near-term RR-QA development area. The dataset will be integrated with logging, sectional interpretation and QA/QC data to refine the QA geological and grade-control model.

Drilling Programme and Results

Queen Alexandra plan view showing grade-control drillholes, section lines, assay distribution and the 2025 MRE conceptual pit shell

Standout uncut intercepts include:


  • BMRC647: 11m @ 8.55 g/t Au from 14m, including 1m @ 67.50 g/t Au from 16m
  • BMRC704: 3m @ 10.05 g/t Au from 21m
  • BMRC596: 4m @ 7.49 g/t Au from 30m
  • BMRC677: 7m @ 3.76 g/t Au from 22m

Additional shallow and broader mineralised intervals include:


  • BMRC690: 8m @ 3.03 g/t Au from surface
  • BMRC692: 5m @ 4.07 g/t Au from 5m
  • BMRC618: 11m @ 3.03 g/t Au from 12m
  • BMRC664: 3m @ 5.53 g/t Au from 17m
  • BMRC569: 3m @ 4.04 g/t Au from 32m

QA Infill Drilling

The QA infill RC drilling results provide additional data across interpreted lode positions within and around the 2025 MRE conceptual pit area. The results are consistent with a stacked, structurally controlled lode system, with mineralised intervals encountered at shallow and moderate depths.

Key highlights from results reported in June 2026 include:


  • BMRC405 returned 3m @ 5.80 g/t Au from 58m (Kestrel Lode), including 1m @ 14.0 g/t Au from 58m, and a second interval of 3m @ 1.38 g/t Au from 100m
  • BMRC438 returned 11m @ 1.13 g/t Au from 20m (Kestrel Lode), including 1m @ 2.60 g/t Au from 28m, providing a broad shallow mineralised interval in the QA area

Additional standout QA infill results reported in April 2026 included:


  • BMRC410: 4m @ 12.3 g/t Au from 32m, including 1m @ 29.4 g/t Au from 32m
  • BMRC425: 7m @ 2.08 g/t Au from 49m, including 2m @ 4.65 g/t Au from 54m
  • BMRC419: 1m @ 2.16 g/t Au from 6m supports potential flexibility in early mine sequencing

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