GoldArc Resources Ltd (ASX:GA8) RC Results Continue to Confirm High-Grade Continuity at Mt Stirling, Central Sector Drilling Advances

21 May 2026

Price Sensitive Announcement $

Highlights:

• Third ASX update of grade control RC assays provides further support for the interpreted grade continuity of high-grade gold shoots and will assist ongoing mine planning and optimisation studies at Mt Stirling, now extending into the central sector of the deposit
• Results received from 81 holes for 2,324m completed with standout intercepts including (all widths are downhole):

  – 1m @ 9.46g/t Au from 13m (BMLRC248)
  – 1m @ 8.38g/t Au from 9m (BMLRC316)
  – 3m @ 3.38g/t Au from 5m (BMLRC321)
  – 4m @ 5.28g/t Au from 0m (BMLRC320)
  – 3m @ 4.57g/t Au from 12m (BMLRC313)
  – 3m @ 4.40g/t Au from 27m (BMLRC242)

• Including wider intercepts:

  – 10m @ 1.80g/t Au from 7m (BMLRC258)
  – 10m @ 1.51g/t Au from 12m (BMLRC256)
  – 9m @ 1.76g/t Au from 2m (BMLRC255)

• ~12,852m of the 34,000m program now completed, representing approximately 38% of total planned metres. Further assay batches are in progress, with results to be released progressively following receipt, QAQC validation, geological review and assessment in accordance with the Company’s continuous disclosure obligations. BML Ventures fund 100% of the grade control program ensuring GoldArc’s capital remains focused on new discovery across the 936km² Leonora district footprint
• Grade control data to feed directly into the mine plan, advancing Mt Stirling toward potential open-pit development under the BMLV 50/50 profit share arrangement

Overview:

GoldArc Resources Limited, a Western Australian gold exploration and development company with a 200,000oz JORC resource base across its Leonora North and South projects, is pleased to report a third batch of assay results from the partner-funded Reverse Circulation (RC) grade control program at the Mt Stirling gold deposit. Results continue to confirm that high-grade gold shoots carry the grade and continuity required for robust mine plan development, with drilling now extending coverage into the central sector of the deposit.

The 34,000m grade control program is fully funded by BML Ventures Pty Ltd (‘BMLV’) under a 50/50 net profit share arrangement, with GoldArc retaining 100% ownership of Mt Stirling (M37/1306). Approximately 12,852m of the program has now been completed, representing approximately 38% of total planned metres. The results reported in this announcement relate to 81 holes for approximately 2,324m targeting the central sector of the deposit.

Grade control drilling advances into the central sector

This third batch of results intercepted both high-grade narrow shoots consistent with the Hydra Fault structural control, and broader lower-grade envelope intercepts — both of which are important inputs to mine plan optimisation. Results continue the pattern established in earlier batches, with the mineralising system now confirmed to be laterally continuous across the deposit footprint.

The grade control program employs a closely spaced drill grid with fences 8m apart and holes approximately 6m apart along the fences, systematically covering the Mt Stirling deposit ahead of potential open pit mining. Unlike exploration drilling, grade control drilling defines ore grades and boundaries at the resolution required for production scheduling, enabling BMLV to optimise extraction, minimise dilution, and maximise gold recovered from each blast zone. The program is contractor-operated by Datum Drilling using RC methods, with samples prepared and assayed at Bureau Veritas in Kalgoorlie under a QAQC program including reference materials and blanks.

At the Mt Stirling deposit, the mineralised zone is associated with high-strain schist-mylonitic deformation within the Hydra Fault and a greenschist-style strongly hydrothermally altered meta-basalt. Gold appears to be preferentially associated with strongly pervasively silicified, sulphidic intervals with elevated arsenic contents. Results from the central sector are geologically consistent with the north-western sector results reported in prior announcements, confirming that the mineralising system is laterally continuous across the deposit footprint.

A significant pipeline of further assay batches has already been received and will be reported progressively as data is processed, with batches covering samples dispatched through to 16 May 2026 currently pending receipt of assays.

Company Notes:

GoldArc Resources Managing Director, Paul Stephen, commented:

“These results are encouraging and provide useful additional grade control information for the Mt Stirling deposit. The high-grade shoots at Mt Stirling remain evident across both the north-western and central sectors of the deposit and this consistency gives us and our partner, BMLV, additional information to support ongoing mine planning and optimisation work. Intercepts such as 1m @ 9.46g/t Au and 4m @ 5.28g/t Au are highly encouraging.

Equally important are the wider intercepts. Results like 10m @ 1.8g/t and 9m @ 1.76g/t indicate that mineralisation is present across broader zones as well as in narrower higher-grade intervals. This information will be incorporated into ongoing geological modelling, grade control interpretation and mine planning studies.”

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