GoldArc Resources Limited (ASX: GA8) — Round Six Delivers Widest Intercept of the Program at Mt Stirling Gold Deposit, Western Australia

11 June 2026

Price Sensitive Announcement $

Highlights:

• Six rounds of grade control results continue to return elevated grades and wide mineralisation at the Mt Stirling gold deposit in Western Australia, with the sixth batch delivering the broadest single intercept of the entire program
• Standout intercepts from Round Six include:
  • 29m @ 2.06g/t Au from 2m including 1m @ 16.9g/t Au from 6m (BMLRC069) — the widest single interval returned across all six rounds
  • 25m @ 2.47g/t Au from 1m including 1m @ 11.8g/t Au from 4m (BMLRC057)
  • 18m @ 5.66g/t Au from 1m including 1m @ 42.8g/t Au from 2m and 1m @ 10.05g/t Au from 4m (BMLRC044)
  • 9m @ 6.57g/t Au from 16m including 5m @ 12.71g/t Au from 17m (BMLRC081)
  • 1m @ 25.4g/t Au from 21m (BMLRC073)
• Grade control drilling has commenced at the adjacent Mt Stirling Well deposit (M37/1305), hosting a JORC Inferred Resource of 198,000t @ 2.3g/t Au (15,000oz), with first results confirming high-grade near-surface mineralisation including 1m @ 10.7g/t Au from 5m and 1m @ 6.4g/t Au from 0m
• Approximately 20,639m of the 34,000m program is now complete, representing 61% of total planned metres across 38 holes for 1,212m in the eastern sector of Mt Stirling
• The grade control dataset is approaching the stage required to inform preliminary mine planning at Mt Stirling, advancing the deposit toward potential open-pit development under the BMLV 50/50 net profit share arrangement
• The entire 34,000m grade control program is fully funded by BML Ventures Pty Ltd, with GoldArc retaining 100% ownership of both Mt Stirling and Mt Stirling Well

Overview:

GoldArc Resources has delivered its sixth batch of assay results from the partner-funded RC grade control program at Mt Stirling in Western Australia, with the latest results reinforcing both the breadth and grade continuity of the mineralised system and confirming the ore envelope widens toward the eastern sector of the deposit.

The standout result of the batch is hole BMLRC044, returning 18m @ 5.66g/t Au from 1m — including a high-grade sub-interval of 1m @ 42.8g/t Au from 2m — one of the strongest combined grade-width results recorded across the entire program to date. BMLRC069 delivered the widest single interval of the program at 29m @ 2.06g/t Au from 2m, while BMLRC081 added a high-grade hit of 9m @ 6.57g/t Au from 16m including 5m @ 12.71g/t Au. Taken together, the sixth batch further confirms systematic lateral continuity of the mineralising system from northwest to east across the full drilled deposit footprint — a critical input for grade control modelling and mine plan optimisation.

Gold mineralisation at Mt Stirling is hosted within high-strain schistose-mylonitic deformation within the Hydra Fault, within strongly hydrothermally altered meta-basalt, with gold preferentially associated with silicified, sulphidic intervals carrying elevated arsenic content.

In a meaningful expansion of the active program, grade control drilling has also commenced at the adjacent Mt Stirling Well deposit approximately 700m southwest of Mt Stirling. Hosting a JORC Inferred Resource of 198,000t @ 2.3g/t Au, Stirling Well features a structurally distinct style of mineralisation — narrow, flat-dipping quartz veins within a granitoid host — and first results from 16 holes have confirmed near-surface high-grade mineralisation consistent with the resource model, adding further optionality to the broader Leonora North development scenario.

With 61% of the 34,000m program now complete and the final third of drilling underway, the grade control dataset is approaching the threshold required to feed directly into preliminary mine planning at Mt Stirling under the Company’s 50/50 net profit share arrangement with BML Ventures.

Company Notes:

GoldArc’s Managing Director Paul Stephen described the results as strong, continuing to build confidence in the Mt Stirling ore body. He highlighted the 18m intercept at 5.66g/t — including a 42.8g/t sub-interval — as a compelling result combining both the width and grade characteristics the Company wants to see as it builds toward a mine plan, alongside the 29m intersection representing the widest result returned across the entire program. Stephen also noted the commencement of grade control drilling at Mt Stirling Well as a meaningful step, adding that the deposit’s 15,000oz JORC resource at 2.3g/t Au brings further optionality to the broader Leonora North development scenario.

About GoldArc Resources Limited (ASX: GA8):

GoldArc Resources is an ASX-listed gold exploration and development company advancing the Mt Stirling gold deposit in Western Australia’s Leonora North hub. The Company’s 34,000m RC grade control program — fully funded by BML Ventures under a 50/50 net profit share arrangement — is systematically defining ore grades and boundaries ahead of potential open-pit mining at Mt Stirling, with GoldArc retaining 100% ownership of both the Mt Stirling and Mt Stirling Well deposits.

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