Highlights

• Altair Minerals (ASX:ALR) has completed over 10,000m of combined drilling at the Greater Oko Project in Guyana, across both South Oko (SOKO) and North Peters targets.

• A high-grade in-situ grab sample of 32.98g/t gold was taken from the floor of Trench TR-W1-06, approximately 7m along strike from the previously reported 10m @ 10.15g/t Au interval.

• RC drilling at SOKO has defined three distinct structural corridors — Western, Central and a newly uncovered Eastern Corridor — building an increasingly detailed target model.

• An additional diamond drill rig has been secured for SOKO to enable rapid follow-up of any mineralisation identified by RC drilling and deeper testing into the enriched core.

Altair Minerals Limited (ASX:ALR), an ASX-listed gold and mineral explorer focused on the Greater Oko Project in Guyana and the Olympic Domain Project in South Australia, has reported a significant milestone in its drill program. The company has now completed over 10,000 metres of combined drilling at the Greater Oko Project across its South Oko (SOKO) and North Peters targets. This milestone coincides with compelling geochemical and geological updates that are refining the exploration model at SOKO and expanding the known footprint of potential mineralisation.

South Oko RC Drilling and Target Model

The Phase I Reverse Circulation (RC) program at the SOKO W1 target has now completed 102 holes for approximately 6,262 metres. Geological logging of RC chips has confirmed continuity of host lithology, quartz veining, and alteration consistent with the mineralised structures observed in surface trenches. This vertical continuity indicates that the gold-bearing system extends at depth beyond the surface expressions previously mapped. Critically, the RC work has led to the definition of three distinct structural corridors at the W1 target area: the Western Corridor, the Central Corridor, and a newly uncovered Eastern Corridor that had not previously been tested by deep trenching.

The Eastern Corridor represents a fresh and potentially significant new drill target. It has been defined by RC hole logging showing high-density quartz-carbonate veining, chlorite and sericite-silica alteration, and disseminated pyrite — all hallmarks of a prospective structurally controlled gold system. This corridor sits on the Margin of the main W1 soil anomaly and provides a material extension to the known target footprint.

High-Grade Geochemical Results

The standout result from the latest geochemical program is a high-grade in-situ grab sample of 32.98g/t gold, collected from the floor of Trench TR-W1-06 approximately 7 metres along strike from the previously reported 10-metre channel interval returning 10.15g/t gold. A second in-situ grab sample approximately 3 metres further west returned 2.65g/t gold. These results, taken from sheared sediments with brecciated quartz veins, confirm that the high-grade mineralised zone extends beyond the trench channel line into ground where surface sampling was previously limited by hard duricrust. The RC drilling program is specifically testing this extension.

New Parallel Shear Target and Resource Jurisdiction

Soil geochemical sampling across a new Parallel Shear Target located approximately 4km west of the SOKO W1 zone has returned anomalous gold results, including a peak of 1,669 parts per billion (ppb) gold and a continuous 300-metre-wide zone of elevated gold anomalism on one of the survey lines. This target lies along a parallel greenstone-granite contact structure, analogous to the first-order deformation corridor that hosts the main SOKO mineralisation. Guyana has emerged as a premier gold exploration destination, with the Greater Oko Project's 457km² contiguous landholding positioned within a highly prospective and largely underexplored greenstone belt.

Key Insights

The identification of three structural corridors at SOKO, including the new Eastern Corridor, materially expands the exploration target area beyond what was previously understood.

The 32.98g/t gold grab sample, taken in the same host rock and structure as the main trench interval, confirms the high-grade shear zone continues along strike into unsampled ground.

The upcoming maiden RC assays from SOKO and diamond drill results from North Peters represent the most significant near-term catalysts for Altair's share price.

The new Parallel Shear Target, with its peak soil result and continuous anomalous zone, provides an additional drill-ready opportunity within the existing landholding.