Altitude Minerals Commences RC Drilling at Byrock Copper-Gold Project

Altitude Minerals Puts Drill Bit to Ground at Byrock — Porphyry Copper-Gold Testing Begins in NSW

Altitude Minerals Ltd (ASX: ATT) has commenced reverse circulation (RC) drilling at its Byrock Copper-Gold Project in New South Wales, marking a pivotal transition from target definition to active drill testing of concealed porphyry-style systems. The Altitude Minerals Byrock copper gold drilling in NSW is now fully underway, with a ~2,300 metre program targeting three high-priority Pipe Targets beneath shallow cover on the company's interpreted north-west extension of the Macquarie Arc — one of Australia's most historically productive copper-gold geological corridors.

The program is being operated in collaboration with project partner Nimrod Resources Ltd under an existing Earn-in and Joint Venture (JV) agreement, with Altitude's own geology team embedded in the operation. Drilling is expected to complete in June 2026, weather permitting, with laboratory results to follow.

"With drilling now commenced at Byrock, Altitude is moving from target definition to drill testing of concealed porphyry-style systems beneath shallow cover on the Company's interpreted extension of the Macquarie Arc. The program is designed to test pipe-like geophysical targets in a disciplined, cost-effective manner, and we look forward to updating shareholders on the results." — Managing Director Duncan Chessell

From Target Definition to the Drill — A Long Road Reaches Its Destination

The commencement of drilling at Byrock represents the culmination of a systematic exploration campaign that has been building since early 2025. The sequence of work leading to this point reflects a methodical, evidence-driven approach:

1. February 2025 — Byrock Project secured, establishing a pipeline of copper-gold targets
2. May 2025 — Geophysics update identifies high-priority Cu-Au porphyry drill targets
3. September 2025 — High-priority targets formally identified and defined
4. February 2026 — Air-core drilling results support the interpreted north-west extension of the Macquarie Arc; Altitude advances earn-in with Nimrod Resources
5. May 2026 — Compelling drill targets defined and publicly announced
6. May 2026 — Drilling permits issued and rig contracted
7. June 2026 — RC drilling commenced

This progression — from geophysical surveying through to air-core confirmation drilling, target refinement, permitting, and now RC drilling — demonstrates a disciplined exploration workflow that systematically de-risks each step before committing capital.

What Is a Porphyry Copper-Gold System, and Why Does It Matter?

For investors new to mineral exploration, understanding what Altitude is actually drilling for provides essential context.

What Is a Porphyry Deposit?

A porphyry copper-gold deposit is a large-scale, low-to-moderate grade mineralised system formed by fluids released from cooling magmatic (igneous) bodies deep in the earth's crust. These fluids carry copper, gold, and other metals that precipitate as they cool, often creating large, disseminated ore bodies that can extend hundreds of metres in all directions. The term "porphyry" refers to a specific igneous rock texture associated with these systems.

Why Do They Matter to Investors?

Porphyry deposits are among the most economically significant ore deposit types in the world. They are the source of the majority of the world's copper production and a substantial share of gold output. Furthermore, while individual grades can be modest, the sheer scale of these systems — often hundreds of millions to billions of tonnes — makes them highly attractive exploration targets. Discoveries of new porphyry systems have historically been company-transforming events.

What Are "Pipe Targets"?

Pipe Targets refer to roughly cylindrical geophysical anomalies that, in plan view, appear as discrete "pipes" beneath the surface. These shapes are characteristic of the roots of porphyry or breccia pipe systems. Altitude has identified three such targets at Byrock using geophysical surveys, and these are now the focus of the current drill program.

Glossary of Key Terms

The Byrock Program in Detail

The current program is structured to efficiently test the three highest-priority targets identified through prior geophysical and geochemical work.

A notable operational feature of the chosen rig is its flexibility. The UDR1000 is a multi-purpose rig capable of switching between RC and diamond core drilling should ground conditions require it. Contingency equipment has been placed on site to ensure all three targets can be effectively tested regardless of subsurface conditions — a practical risk management measure that protects the program's integrity.

The Macquarie Arc — A Proven Address for Copper-Gold Discovery

The Macquarie Arc is a well-recognised geological terrane in New South Wales with a proven track record of hosting world-class copper-gold porphyry mineralisation. It is the geological host to several of Australia's most significant copper-gold deposits and has attracted exploration and development interest from major and mid-tier miners alike.

Altitude's interpretation positions the Byrock Project on a north-west extension of the Macquarie Arc — a segment that, until recent work by Altitude and Nimrod, had not been systematically drill tested for concealed porphyry-style mineralisation. The prior air-core drilling program, with results released in February 2026, was described as supporting this interpreted extension, consequently providing geological confidence ahead of the current deeper RC program.

The significance of operating within or adjacent to a proven metallogenic province is that the geological setting is already understood to be capable of hosting large-scale mineralisation — reducing one of the key unknowns in greenfields exploration.

What Comes Next — Catalysts to Watch

The near-term newsflow from Altitude is clearly defined and sequenced:

1. Drilling completion — Expected by end of June 2026 (weather dependent)
2. Sample dispatch to laboratory — Following completion of each hole
3. Laboratory results release — Assay turnaround times will determine timing; results to be reported as received
4. Program assessment — Geological interpretation of results to determine follow-up steps

The clean, linear nature of this catalyst sequence means investors can track progress against clear milestones. Each step — completion, sampling, assay receipt, and interpretation — represents a discrete news event.

The Investment Thesis — Why Byrock Deserves Attention

Several factors converge to make the Altitude Minerals Byrock copper gold drilling in NSW a meaningful moment for Altitude shareholders and prospective investors alike.

1. Concealed Targets in an Underexplored Segment

The Byrock targets sit beneath shallow cover in an area interpreted as a north-west extension of the Macquarie Arc. Shallow cover can be both a reason why mineralisation has been historically overlooked and an advantage — cover suppresses surface expressions that would otherwise attract early explorers, potentially leaving genuinely untested systems available.

2. Geophysically and Geochemically Supported Targets

The Pipe Targets being drilled are not speculative. They have been defined through a multi-stage process including geophysics and air-core drilling, with prior results described as supportive of the Macquarie Arc extension interpretation. The targets have, in other words, earned their place at the front of the queue through systematic work.

3. JV Structure Manages Cost and Risk

Operating under an earn-in and JV arrangement with Nimrod Resources means the program is being conducted collaboratively, with the operational burden shared. This structure enables Altitude to participate in a meaningful drill program while managing its own balance sheet exposure.

4. Disciplined, Cost-Effective Execution

The company's stated approach — testing targets "in a disciplined, cost-effective manner" — is reflected in the choice of RC drilling (generally lower cost than diamond core) with a contingency plan to switch to diamond drilling only if conditions require. This is capital-efficient exploration management.

5. Proximity to Established Mines

Altitude's broader corporate description notes that its projects sit within geological domains containing established profitable mines — a factor that underpins the geological prospectivity of the areas it targets.

Why Investors Should Keep Altitude on Their Radar

Altitude Minerals sits at an inflection point. The months of preparatory work — geophysics, air-core drilling, target definition, permitting, and rig contracting — have delivered the company to the point where the drill bit is in the ground. The next phase is the one that counts: results.

For junior explorers, drill results from well-defined, geologically credible targets represent the highest-impact catalysts available. A positive intersection at any of the three Byrock Pipe Targets — particularly one consistent with a porphyry-style system — would be a material development for the company and its investors.

The Macquarie Arc's established reputation as a copper-gold province provides important geological context. Altitude's interpreted north-west extension, if validated by these holes, could open up a new chapter of exploration along a corridor that has not previously been subject to systematic deep testing.

The operational structure of the current program — conducted under an earn-in and JV arrangement with experienced project partner Nimrod Resources — provides a risk-managed approach to this critical testing phase. The embedded Altitude geology team ensures the company maintains direct involvement and geological control while sharing operational responsibilities.

Furthermore, the timing of this program aligns with broader copper market dynamics, where new discoveries of large-scale porphyry systems are increasingly valued by investors as the world grapples with copper supply constraints amid growing demand from energy transition technologies.

Key Takeaway: Altitude Minerals Byrock copper gold drilling in NSW has transitioned from exploration planning to active drill testing, with a ~2,300m RC program now underway targeting three concealed porphyry-style Pipe Targets on the interpreted north-west extension of the Macquarie Arc. With results expected in the coming weeks, Byrock represents a near-term, binary catalyst that investors in the copper-gold exploration space should have firmly on their watchlist.

Want to Know More About Altitude Minerals' Byrock Copper-Gold Project?

With RC drilling now underway at Byrock and three high-priority Pipe Targets being tested on the interpreted north-west extension of the Macquarie Arc, Altitude Minerals (ASX: ATT) is approaching a pivotal moment that copper-gold investors won't want to miss. To stay across the latest developments, review the project's exploration progress, and assess the investment case for yourself, visit the Altitude Minerals Investor Centre.