Macro Metals Uncovers High-Grade Iron Discovery at Extension Iron Project

Macro Metals Uncovers High-Grade Iron Beyond Existing Resource and Advances Approvals at Extension Iron Project

Macro Metals Limited (ASX: M4M) has reported high-grade iron assay results from previously unexplored ground north of its existing 16.1 million tonne JORC Resource at 54.2% Fe at the Extension Iron Project in Western Australia. In addition, parallel environmental surveys have returned no identified threatened ecological communities, priority ecological communities, restricted vegetation or restricted landforms in the study areas.

According to the ASX announcement, the update matters because it combines early evidence of resource growth potential with measurable progress on the approvals path toward a near-term development timetable.

The announcement outlines two linked value drivers. First, mapping and rock chip sampling have identified iron grades of up to 62.12% Fe around 1.2 kilometres north of the existing resource. Second, environmental fieldwork completed by Phoenix Environmental Sciences appears to have cleared an important technical step required for approvals submissions planned in Q3 2026.

High-Grade Iron Identified North of the Existing JORC Resource

According to the announcement, Macro Mining Services Pty Ltd (MMSV), Macro Metals' wholly owned mining services subsidiary, completed targeted mapping and rock chip sampling in May 2026 across Priority Exploration Areas directly north of the current resource envelope.

These areas had not previously been explored, which the company said was likely due to lack of access via existing tracks. Furthermore, MMSV selected the targets using pre-field geological interpretation that drew on mapped geology, landforms and historic government WAMEX datasets across the granted mining lease.

The key result is that sampling from surface outcrops returned grades that are comparable to, and in some cases above, the average grade of the existing resource.

Standout Surface Sample Results

The two highest-grade samples, EX926 and EX905, are materially above the project's existing resource grade of 54.2% Fe. Their relatively low silica, alumina and phosphorus readings are also relevant, as those impurities can influence ore quality and downstream product attractiveness.

Macro stated that the geological style is consistent with a channel iron deposit (CID) system, which is a type of iron ore deposit formed in ancient river channels. The company also noted similarity to nearby Pilbara operations such as BHP's Yandi and Rio Tinto's Yandicoogina, although the announcement does not imply equivalence in scale, economics or development status.

Managing Director Commentary

"These results reinforce our long-held view that the Extension Iron Project has excellent prospectivity for further high-grade iron," said Simon Rushton, Managing Director of Macro Metals.

"Our team will continue to advance exploration and technical services work in parallel with the approvals and permitting works we are conducting under our mining services contract; all with the clear focus on maximising value and return on our investment in the Project as soon as possible."

Why the New Sampling Matters for Investors

The significance of these results lies in location, grade and geological consistency. The new Priority Exploration Areas sit just north of the existing Indicated Mineral Resource. In the report, MMSV's geology team stated that mineralised units observed during mapping appear to be around 2 metres to 10 metres thick, broadly in line with thicknesses already recorded in the existing resource area to the south.

That does not confirm resource extension, but it does suggest the new mineralisation may belong to the same broader iron-bearing system. For investors, this creates a clear follow-up question: could additional fieldwork and later drilling convert this surface evidence into a larger defined resource base?

At this stage, the answer remains open. The company was careful to state that the rock chip samples are selective in nature, are not representative of the complete geological profile, and cannot be used in a mineral resource estimate. That is an important distinction, as surface samples can indicate prospectivity but do not establish continuity, tonnage or mineable geometry.

Understanding Rock Chip Sampling and What It Can Tell the Market

Rock chip sampling is one of the earliest tools used in mineral exploration. Geologists collect small pieces of rock from exposed outcrops, usually where mineralisation is visible at surface, and send those samples for laboratory analysis.

At iron ore projects, this approach can be particularly useful because mineralised material is often exposed near surface. It allows an exploration team to test whether a target area contains iron-rich rock before committing to more expensive drilling.

What Rock Chip Sampling Can Show

• Presence of mineralisation at surface
• Indicative iron grade
• Impurity levels such as silica, alumina and phosphorus
• Whether a target area warrants further work

What It Cannot Show on Its Own

• Continuity at depth
• True thickness across a deposit
• Tonnage
• Resource classification under JORC

A few technical terms in the announcement are worth clarifying for non-specialist readers:

• Fe % means the percentage of iron in the sample by weight.
• JORC Resource refers to a resource estimate reported under the Australasian JORC Code, which sets reporting standards for exploration results and resources.
• Direct Shipping Ore (DSO) generally refers to ore that may be sold without complex processing, although commercial suitability still depends on a range of factors.
• LOI, or loss on ignition, measures weight lost when a sample is heated intensely, often reflecting moisture and other volatile components.

In this case, the sampling results suggest the northern target area carries grades worth follow-up work. However, the next step required to build confidence is drilling.

Environmental Surveys Support the Approvals Pathway

The second half of the update focused on environmental work, which is often just as important as geology in moving a project toward development. According to the announcement, MMSV engaged Phoenix Environmental Sciences to complete a package of studies needed to support the environmental approval process.

Phoenix had previously worked on the project and contributed to earlier flora and fauna studies that fed into Ministerial Statement 1005, which was granted in May 2015. The new work included three main components:

1. Desktop flora and fauna assessment
2. Detailed flora and vegetation field survey
3. Basic and targeted terrestrial fauna survey

The desktop review confirmed that earlier project surveys were broadly compliant with current technical guidance. More importantly, preliminary advice from Phoenix indicated that no threatened ecological communities, priority ecological communities, restricted vegetation or restricted landforms were identified in the surveyed study areas.

Environmental Survey Outcomes

These findings do not complete the approvals process, but they remove one layer of uncertainty. The company said detailed reports, including any future study recommendations, are expected in late July 2026 for inclusion in primary approvals submissions.

For investors, this part of the update is important because environmental survey outcomes can materially influence timelines, costs and project design. A clean early result can help keep the approvals process on schedule, though final approval outcomes still depend on regulator assessment and submission quality.

Next Steps From Q3 2026 Into Q1 2027

The ASX announcement laid out a structured work programme covering both exploration and approvals. According to the company, several milestones are expected over the next two to three quarters.

Planned Milestones

The company said its primary approvals application is expected to involve referral of an Environmental Review Document under Section 38 of the Environmental Protection Act (WA) 1986, representing a significant amendment to existing Ministerial Statement 1005, alongside a federal submission under the Environment Protection and Biodiversity Conservation Act 1999.

Secondary approvals are expected to run in parallel. This includes a Mine Development Closure Plan under the Mining Act (WA) 1978 and a Part V EP Act licence application. Parallel processing may shorten the overall development timeline if submissions proceed smoothly, although timing remains management guidance rather than a guaranteed outcome.

Existing Project Base and Macro Metals' Economic Exposure

Macro Metals' exposure to the Extension Iron Project is not limited to exploration upside. The company stated that it holds a 27.3% interest in the project through its shareholding in Project Rusty Pty Ltd, the project owner.

At the same time, its subsidiary MMSV is the mining services contractor under a life-of-mine services agreement structured at cost plus 15%. This gives Macro Metals two identifiable economic levers:

• Equity exposure to project value growth through its 27.3% holding in Project Rusty
• Services exposure through MMSV's cost-plus mining services arrangement

The company also referenced previously announced export access of up to 4 million tonnes per annum via Utah Point from Q4 2026. That infrastructure access is relevant because transport and port options can be critical for small and mid-scale iron ore developments.

What This Update Means in the Context of the Extension Iron Project

Taken together, the latest announcement strengthens the investment case around the Extension Iron Project without removing the need for further technical proof. On the exploration side, the high-grade rock chip results suggest the project may host additional iron mineralisation beyond the current 16.1 million tonne resource boundary.

On the approvals side, the environmental survey results appear to support the company's target of lodging primary approvals in Q3 2026 and aiming for final approvals in Q1 2027. Several near-term catalysts now stand out:

• Further mapping and sampling in Q3 2026 to better define mineralised units
• Approvals lodgement under state and federal pathways
• Drill planning and testing to assess extent and continuity of the newly identified mineralisation
• Detailed environmental reports due in late July 2026

For informed retail investors and mining sector followers, the central issue is straightforward. Can Macro Metals convert encouraging surface results into a resource growth story while keeping the project on its stated path toward development approvals?

The current announcement does not answer that question fully. However, it does provide fresh evidence that both workstreams are moving forward simultaneously. That combination is often closely watched in junior iron ore stories, particularly where an existing JORC Resource, defined approvals pathway and identified export route are already in place.

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