Altair Minerals Advances Guyana Gold Targets with $28M Boost and Expands Copper Play

• Raised $28.2 million from Endeavour Mining subsidiary
• Discovered multiple high-grade gold intercepts at North Peters
• South Oko geophysics defines priority drill targets
• Olympic Domain copper project faces ongoing legal matter with BHP
• Venatica copper project under technical review with option extended

Strategic Capital Injection Fuels Guyana Exploration

Altair Minerals (ASX:ALR) closed March 2026 with a robust cash balance of $10.2 million, swiftly followed by a $28.2 million strategic placement to Endeavour Gold Corporation, a subsidiary of Endeavour Mining plc. This injection lifts Altair’s war chest to nearly $40 million, enabling a significant ramp-up in exploration across its Greater Oko gold project in Guyana. The placement, secured at a 5% premium, not only boosts funding but also brings Endeavour’s technical expertise to bear, setting the stage for an expanded drilling campaign nearly doubling to 50,000 metres with multiple rigs deployed simultaneously. This move positions Altair as a serious contender in a district now dominated by two billion-dollar players consolidating the adjoining Oko-Ghanie Project.A$28.2 million placement

North Peters Delivers Exceptional Gold Intercepts and New Targets

The acquisition and consolidation of historic drilling databases at North Peters have uncovered a string of compelling high-grade gold intercepts, including standout hits such as 89 metres at 2.40 grams per tonne (g/t) gold from 45 metres depth, featuring 24 metres at 7.17 g/t from 51 metres. Other notable intercepts include 63 metres at 2.25 g/t from 55 metres and 11 metres at 7.38 g/t from surface, underscoring the scale and grade potential. These results stem from drilling largely peripheral to a major, untested chargeability high anomaly identified in recent ground geophysics, which remains open along strike and at depth. The resistivity surveys further delineate a 2.7-kilometre corridor that is only partially drill tested, hinting at significant upside along a structurally controlled mineralised system extending northeast towards the newly defined Old Granny target. This target, historically underexplored, has already returned encouraging intercepts, including 24 metres at 1.28 g/t gold from 7 metres, suggesting the mineralised system’s strike and depth potential could be substantially larger than previously understood.North Peters high-grade intercepts

South Oko Geophysics and Soil Sampling Define Drill Priorities

At South Oko, Altair’s ground IP chargeability and resistivity surveys have been pivotal in mapping the extension of the Oko Shear Contact, a structural corridor hosting recent multi-million ounce discoveries. The surveys revealed multiple distinct chargeability highs coincident with soil geochemical anomalies, defining priority drill targets such as W1-C, W3-C, W2-C, and W4-C. The W1 soil anomaly, now confirmed as the largest coherent gold-in-soil anomaly exceeding 100 parts per billion over 2.2 kilometres strike, aligns tightly with these geophysical highs, reinforcing the prospectivity. Trenching programs have been extended to penetrate beyond superficial duricrust layers, targeting mineralisation in saprolite and saprock zones, where high-grade gold is more likely to be encountered. These integrated datasets set the stage for a maiden RAB and diamond drilling campaign, scheduled to commence imminently, aiming to convert these compelling targets into defined mineral resources.South Oko geophysics define targets

Olympic Domain Copper Project Faces Legal Challenge Amid Exploration

Altair’s Olympic Domain Project in South Australia, located within the prolific Gawler Craton copper province, remains a high-potential IOCG exploration play with significant mineralised intercepts encountered at depth, including 115 metres at 0.68% copper equivalent from over 1,000 metres. However, the project is currently embroiled in a legal matter with BHP, which has expressed intentions to use part of Altair’s tenements for infrastructure related to its Oak Dam deposit. Altair has engaged top commercial mining lawyers and is pursuing a resolution that safeguards its exploration rights and asset value. Despite the dispute, Altair plans to follow up on untested geophysical targets as soon as a commercial outcome is reached, maintaining the project’s strategic importance amid a buoyant copper market.Olympic Domain legal matter

Venatica Copper Project in Peru Under Technical Review

The Venatica Project in Peru, situated along the world-class Andahuaylas-Yauri Porphyry Belt, continues to be evaluated for its district-scale copper potential. The project benefits from excellent infrastructure and proximity to major copper mines such as Las Bambas. Altair has extended its exclusive option to acquire 80% of the Irka permit while maintaining full ownership of the broader Venatica area. Surface programs have delineated multiple copper-anomalous zones and porphyry-style mineralisation, though no material changes have been reported this quarter. The company appears poised to determine next steps pending further technical and due diligence assessments.

Corporate and Financial Overview

Exploration expenditure during the quarter totalled $1.74 million, focused primarily on Guyana projects, with no mining production reported. Director fees were paid as disclosed in the Appendix 5B. Altair’s strengthened balance sheet and strategic partnership with Endeavour Mining underpin an aggressive exploration push in a globally emerging gold district, while legal and technical challenges in its copper assets demand close attention. The company’s extensive landholdings across Guyana, Australia, and Peru position it to capitalise on multiple commodity cycles and exploration frontiers.

Bottom Line?

Altair’s substantial capital raise and expanding drill targets in Guyana set the stage for a potentially transformative year, but the outcome of its legal dispute with BHP and execution of drilling programs will be critical to watch.

Questions in the middle?

• How will the legal dispute with BHP resolve and impact Olympic Domain’s exploration timeline?
• Can Altair’s expanded drilling at North Peters and South Oko convert geophysical anomalies into a resource?
• What are the implications of Endeavour Mining’s strategic investment for Altair’s exploration strategy and potential partnerships?