Lac Gold drilling reveals wider Astoria system ahead of resource update

AS-26-827 broadens the Astoria picture

Lac Gold Limited (ASX:LAC) has produced its most consequential result in this batch from drillhole AS-26-827, which returned 50.0 metres at 2.03g/t gold from 160.5 metres. Inside that interval was a 10.0-metre zone grading 8.28g/t, including 4.0 metres at 15.80g/t.

“Astoria long section showing the latest drilling, significant intersections and existing Mineral Resource envelopes.”

The result is helping revise the geological interpretation of part of Astoria, where the company says mineralisation may be more extensive than previously modelled. It follows a run of broad Astoria gold zones reported earlier in the 2026 drilling program, but the latest announcement adds an important wrinkle: gold is appearing beyond the principal ultramafic host rocks.

High grades appear within wider mineralised intervals

Other results included 9.0 metres at 5.20g/t gold from AS-26-826, including 1.5 metres at 27.00g/t, and 31.55 metres at 1.39g/t from AS-26-824. The latter included 3.25 metres at 5.34g/t and 1.35 metres at 5.78g/t.

“Astoria cross-section CC’”

“Astoria cross-section BB’”

Caption and image © Lac Gold Limited. From “Latest Drilling Identifies Additional Mineralisation”, 29 Oct 2026.

AS-26-819 returned 25.5 metres at 1.02g/t, including 8.0 metres at 2.75g/t, while AS-26-825 intersected 10.0 metres at 1.86g/t in sedimentary wackes, including 0.54 metres at 26.70g/t. Those intersections support the company’s interpretation of broad mineralised zones containing narrower higher-grade shoots, although the reported lengths are downhole measurements and true widths have not yet been established.

Sedimentary rocks enter the resource equation

“Astoria cross-section A–A′”

The sedimentary-hosted result from AS-26-825 matters because historical modelling at Rouyn has focused heavily on mineralisation associated with the altered Piché ultramafic corridor. Lac Gold now says its 2026 drilling is providing increasing evidence that surrounding volcanic and sedimentary formations also contain significant gold mineralisation.

That does not yet translate into additional resources. It does, however, give the company more geological information to incorporate into its modelling and future drilling priorities. Lac Gold says structural contacts, deformation, quartz-carbonate veining and alteration are helping its geological team identify settings that may be favourable for higher-grade mineralisation.

Q1 2027 resource update remains the key test

Measured Group is undertaking the updated Mineral Resource Estimate, which will incorporate the latest assays, validated 2026 drilling data and the revised geological interpretation. The current Rouyn resource stands at 1.666 million ounces at 3.28g/t gold, comprising Indicated and Inferred material from the April 2025 estimate.

“Haithem Bennia (Explo-Logik) and Lindsay Farley (Measured Group) reviewing Astoria drill core during the technical validation site visit for the Mineral Resource update.”

“Drillhole collar plan showing AS-26-819 to AS-26-827 at Astoria, Rouyn Gold Project (NAD 1983 UTM Zone 17).”

Caption and image © Lac Gold Limited. From “Latest Drilling Identifies Additional Mineralisation”, 29 Oct 2026.

The eventual update will assess changes to tonnes, grade, contained ounces and resource classification. Its outcome remains dependent on the estimation process, and the filing does not claim that the resource will increase. Drilling is continuing at Astoria, with 81 holes completed for 32,519 metres, while 14 holes covering 6,682 metres were still at the laboratory awaiting assays at the time of the announcement.