Altair Minerals Reports 34.56g/t Gold Grab Samples and Defines Key Geophysical Targets

High-Grade Gold Samples Confirm Primary Mineralisation at South Oko

Altair Minerals Limited (ASX:ALR) has reported standout grab samples from its South Oko (SOKO) project in Guyana, with assays up to 34.56 grams per tonne (g/t) gold. These samples come from quartz veins exposed at the base of Trench 6, the first deep trench to penetrate the laterite duricrust at around 6 metres depth. The results provide compelling evidence of primary gold mineralisation beneath the typically barren laterite cover, validating Altair’s exploration model that mineralisation sits directly below leached duricrust overlain by a broad anomalous halo in soils and laterites.

These grab samples complement earlier high-grade intercepts reported at South Oko and reinforce the prospectivity of the area, which lies along the prolific Oko Shear contact. The trenching program, now supported by over 400 soil samples and 1.5 kilometres of trenching with assays pending, continues to refine the geological understanding and target definition at SOKO.

Pole-Dipole IP Survey Defines Deep, Continuous Chargeability Structures

The company’s recent Pole-Dipole Induced Polarization (IP) survey has identified four major deep-tapping chargeability structures adjacent to the Oko Shear, labelled Structures M, N, L, and O. Structure M stands out with a strike length of approximately 2.5 kilometres and widths between 150 and 250 metres, interpreted as a large-scale sulphide body open to the south. Structure N, while shorter at around 600 metres strike, aligns precisely with a soil geochemical anomaly and shows significant width and depth, enhancing its priority as a drill target.

These geophysical targets are crucial because chargeability anomalies often indicate sulphide mineralisation commonly associated with orogenic gold systems. The survey’s three-dimensional view through overburden provides a clearer picture of the structural plumbing that may host significant gold mineralisation. The findings dovetail with the company’s earlier geochemical programs and trenching results, establishing a coherent exploration framework.

Magnetic Inversion Model Highlights Complex Structural Fabric

Complementing the IP data, magnetic inversion modelling reveals a structurally complex system dominated by a northeast-southwest regional fabric disrupted by north-northeast to south-southwest deformation zones. These deformation zones are interpreted as key fluid pathways for gold mineralisation, consistent with the orientation of nearby known deposits. The magnetic data also delineate a low susceptibility corridor at depth, interpreted as a structural control and shear zone.

The magnetic and geophysical data sets together provide a robust framework for targeting, with the 3D magnetic inversion model offering critical insights into the vertical continuity and orientation of key structures. This integrated approach is expected to guide ongoing trenching and the planned diamond drilling program.

North Peters Drilling to Commence as Exploration Accelerates

While South Oko advances with geophysics and trenching, Altair is gearing up to commence diamond drilling at its North Peters (NP) prospect imminently. The company has completed 28 regional step-out RAB holes averaging 31 metres depth and will now escalate to infill and step-out diamond drilling. This drilling campaign aims to test high-grade mineralisation previously identified at North Peters, complementing the growing pipeline of targets across the Greater Oko Project.

This drilling push follows Altair’s recent A$28.2 million placement which significantly boosted its treasury and enabled expansion of exploration activities. The company’s broader 30,000-metre drilling program is also underway, targeting both North Peters and South Oko, reflecting a strategic acceleration in its discovery efforts across Guyana’s underexplored greenstone belt. The Greater Oko Project’s scale and proximity to multi-million-ounce discoveries by peers such as G2 Goldfields and Reunion Gold add further context to Altair’s exploration momentum.

Ongoing Fieldwork to Refine Targets and Expand Footprint

Altair’s field teams continue to collect extensive soil samples, conduct auger drilling, and expand trenching at South Oko, with over 200 auger holes and 1.5 kilometres of trenching assays pending. The company’s CEO, Faheem Ahmed, emphasised the value of the Pole-Dipole survey in refining drill targets and the structural model, noting that the exploration effort is accelerating on all fronts with plans to scale up programs at both North Peters and South Oko.

This integrated exploration approach, combining geochemistry, geophysics, and drilling, aims to delineate high-grade mineralisation zones and build a multi-year discovery pipeline. The structural complexity and large-scale geochemical anomalies suggest significant potential, though true widths and extents of mineralisation remain to be confirmed by drilling.