New Central Porphyry System Identified at Venatica

Altair Minerals Limited (ASX: ALR) (‘the Company’ or ‘Altair’) is pleased to announce preliminary findings following a site visit where the Company has identified a significant outcrop of stockwork system at Central Porphyry. Outcropping quartzite, magnetite and secondary biotite veined porphyry stockwork which is part of a new separate Central Porphyry – 3km Southwest of the high-grade Irka NE Porphyry².

Key Highlights:

• Identification of new Central Porphyry | Venatica West a Porphyry Cluster
  Site visit has discovered a significant outcrop of leached porphyry stockwork and ultra-potassic vein system which identifies a Central Porphyry intrusive part of a cluster system at Venatica West. Typical alteration and veining present within Bornite-Gold rich Copper Porphyry systems.
• Extremely dense veining and stockwork | Multi-stage Mineralisation
  Stockwork of A-type quartz, magnetite and secondary biotite on Central Porphyry is the densest identified to date across Venatica West, suggesting significant hydrothermal activity, overlapping events, fracturing and multi-stage mineralisation at Central Porphyry, ideal for copper enrichment.
• Small portion of a much larger system | Central Porphyry Remains Open
  Identification of Central Porphyry is an outstanding outcome, due to only a portion of the potassic stockwork zone outcropping, which could’ve easily been missed. Ultra-potassic alteration with dense stockwork as seen within this outcrop, generally tends to expand kilometres, with remaining footprint of alteration sitting under soil cover. Further fieldwork can identify full extent of this Central Porphyry.
• Potential for regional Porphyry system | SW – NE Regional Porphyry System
  Preliminary fieldwork analysis on-going, with already a new Central Porphyry system being identified within virgin grounds at Venatica West, sitting ~3km Southwest of the high-grade Irka NE Porphyry and ~2km Northeast of the Irka SW Porphyry-Skarn system2. Suggestive of a regional SW to NE trending porphyry cluster, filling the intersection of two district faults.
• Community Engagement Commenced | Early Community Approval
  Early engagement has commenced with the local community, with multiple local members showing support for on-going exploration works. Altair’s exploration team has also met with the President of the Community with very positive preliminary discussions. Altair has received initial community approval for exploration works with intention of putting forward long-term proposal of work programs, community incentive programs, project scheduling and local training.

Discovery of New Central Porphyry at Venatica West

The Central Porphyry is located on the Irka permit, situated ~3km southwest of the high-grade Irka NE Porphyry target and is a new intrusion system identified within Venatica West during initial site visit. The upper zone of a new Central Porphyry has been identified through outcrop which consists of leached ultra-potassic stockwork of quartz, magnetite and secondary biotite dense veining, and surrounded by phyllic alteration halo and hosted within overprinted argillic alteration.

The ultra-potassic alteration suggests Altair is standing above the core of the Central Porphyry. The overprinting of strong argillic alteration has occurred from later stage hydrothermal fluids which has replaced the feldspars with clay material while maintaining the stockwork veining – suggesting a multi- stage mineralisation event which can significantly enrich the grades of copper sulphide and hypogene zone below. This leached stockwork from late-stage argillic alteration indicates the copper has been remobilized and disseminated into structurally favourable zones below, with potential to enhance grades within the contacts and breccia’s at the core of the Central Porphyry.

The ultra-potassic zone generally sits right above the core of a Porphyry intrusion and in the case of the Central Porphyry, it is the densest set of stockwork, and veinlets discovered so far at Venatica West, with high alteration suggesting this area is the key part of hydrothermal activity and potentially the feeder to multiple other Porphyry systems.

The presence of dense secondary biotite veining on altered ultra-potassic outcrop not only indicates the presence of a new Porphyry system sitting below but also is an essential element for developing a large-scale Porphyry deposit within this particular belt.

Within other billion-tonne deposits proximal to Venatica, the presence of secondary biotite into the plays a key role in developing “scale” as its presence within porphyry stock and outwards into diorite host rock, tends to allow substitution of Fe²+ and Mg²+ with Cu²+, which can extend the copper mineral deposit footprint by a further ~500m radius in each direction from the main Porphyry core.¹

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