Aruma Resources DHEM Survey Confirms Major Conductor at Tillex

Downhole EM Confirms Major Conductor at Tillex as Aruma Refines Phase 2 Copper-Silver Targets

Aruma Resources Limited (ASX: AAJ) has reported that a fixed loop downhole electromagnetic (DHEM) survey at its Tillex Copper-Silver Project in Ontario has confirmed a strong conductor extending along strike and at depth, sharpening drill targeting ahead of the company's planned Phase 2 programme. According to the ASX announcement dated 16 June 2026, the survey supports a coherent conductive zone across an interpreted 100m to 150m of strike length and depth, with the response continuing beyond current drilling limits to the south-west.

For investors following copper exploration stocks on the ASX, the update matters because it adds higher-resolution geophysical support to an already high-grade historical drilling record at Tillex. Furthermore, Aruma said the DHEM work has refined earlier surface electromagnetic interpretations and provided clearer targets for follow-up drilling intended to expand the known mineralised footprint.

What Did the DHEM Survey Confirm at Tillex?

The DHEM programme was completed across three drillholes, including two from Aruma's recently completed Phase 1 campaign and one historical hole. The company said the data confirmed a single, coherent main conductor zone rather than two separate conductors previously interpreted from surface-based work.

That distinction is important. A unified conductor can simplify the geological model and improve confidence in where mineralisation may continue between and beyond existing holes. Aruma reported that the conductor is interpreted to dip steeply, at around 70 to 85 degrees to the south-east, and may connect shallow drilling with the deeper conductor identified in hole TX26-001.

The company also stated that detailed modelling resolved the broader conductor into two highly conductive plates within a larger conductive corridor. These plates are interpreted to coincide with zones of known wide, high-grade mineralisation and conductive host rocks, including graphitic argillite.

Conductive strength reached up to 100 Siemens, which in geophysical terms indicates a strong response. In practical exploration terms, this can help geologists narrow in on zones more likely to contain sulphide-rich mineralisation, although geophysics alone does not confirm grade.

Managing Director Commentary

"The results from our downhole EM survey at the Tillex Project represent a significant step forward in our understanding of the scale and continuity of this high-grade copper-silver system," said Grant Ferguson, Managing Director.

"Importantly, these results validate our geological model and provide clear, high-quality targets for the next phase of drilling."

Drillholes Used in the Downhole EM Programme

The survey covered three holes, summarised below from the ASX release.

Aruma disclosed several hole-specific outcomes from the modelling work:

• TX26-001 was surveyed to 400m depth and resolved several conductors, including a grouping of very high conductance-thickness responses at 185m downhole
• TX26-002 resolved two moderate conductors at 60m and 95m downhole depth
• TX08-004 resolved three moderately conductive plates at 85m, 90m, and 105m downhole depth

One of the more closely watched interpretations from the release relates to TX26-001, which tested the margin of a highly conductive off-hole anomaly. According to the company, this feature may represent the down-dip extension of the Tillex deposit or conductive package.

Aruma also reported a shallow plunge of about 11 degrees along strike to the south-west. For investors, that may be relevant because a shallow plunge can indicate that the target remains closer to surface as it extends, which can make follow-up drilling more straightforward and potentially more cost-efficient.

Why Does Downhole EM Matter in Copper Exploration?

DHEM is a geophysical method used after drilling to detect conductive material around a drillhole. A transmitter loop is set up on the surface, while a receiver tool is lowered into the hole to measure electromagnetic responses from nearby rocks.

This matters because sulphide minerals, including chalcopyrite, the main copper-bearing mineral mentioned at Tillex, can be electrically conductive. If those sulphides occur in sufficient concentration, they may produce a detectable response.

Surface EM surveys can indicate that a conductor exists in the area, however DHEM generally improves accuracy in three key ways:

• It helps estimate the location of a conductor relative to the hole
• It improves understanding of the conductor's shape and dip
• It can show whether the response continues along strike or at depth

That can make a direct difference to drill planning. Better target definition may reduce unnecessary metres and improve the odds that follow-up holes are testing the right part of the system.

At Tillex, the host package includes graphitic argillite, a conductive rock associated with the copper-silver mineralisation described in the announcement. This means the geophysical response is being interpreted within a geological setting already linked to high-grade intersections in historical drilling.

Simple Glossary for Non-Specialist Investors

Historical Drill Results Continue to Frame the Tillex Opportunity

The DHEM update does not include new assays from Aruma's Phase 1 campaign. However, the announcement references a strong historical drilling record that provides context for why the conductor is attracting attention.

Selected historical intersections cited by the company include:

The report also highlighted several higher-grade internal zones, including:

• 29m at 3.26% Cu and 20.92 g/t Ag from 98m in TX24-022
• 19.2m at 3.39% Cu and 5.64 g/t Ag from 31.80m in TX25-031
• 5m at 5.55% Cu and 355.30 g/t Ag from 89m in TX11-008

These intersections are historical rather than new assay results, but they help explain why conductor continuity is a material technical development. In addition, if conductive responses can be traced between and beyond holes carrying these kinds of grades, the follow-up drilling case becomes easier to define.

What Comes Next in Aruma's Tillex Work Programme?

In the update, Aruma laid out a near-term sequence of work aimed at moving the project from exploration targeting toward a more advanced technical understanding.

The immediate next step is the release of Phase 1 assay results, which the company said are due imminently. Those results are expected to be integrated with DHEM and geological data to refine the next round of targets.

Aruma also plans to assess additional historical drillholes for further DHEM surveying along strike to the south-west. This is presented in the announcement as a cost-effective way to extract more value from existing drill infrastructure before commencing a larger drilling campaign.

The company said planning is underway for a Phase 2 diamond drilling programme of approximately 3,500m to 4,000m. According to the report, that programme is intended to:

• Expand the known mineralised footprint
• Test extensions along strike and down-plunge
• Support future Mineral Resource estimation

Alongside drilling, Aruma intends to submit targeted Phase 1 samples for metallurgical test work. In plain terms, this is early-stage laboratory work to examine how the mineralised material may respond to processing and what copper or silver recovery might be achievable.

A review of historical data is also underway. The company said it is assessing opportunities to re-assay existing pulp samples where multi-element data gaps exist, which could improve understanding of the mineralisation style without requiring more drilling.

Why Does This Update Matter to AAJ Investors?

For exploration investors, the value of this announcement sits less in immediate assay news and more in improved targeting confidence. The DHEM results add technical support to the idea that Tillex hosts a laterally and vertically continuous sulphide-rich system, while also indicating that the conductor extends beyond current drilling.

There are at least four investor-relevant takeaways from the ASX release.

First, the conductor appears open to the south-west and at depth, which suggests room for the mineralised system to grow if later drilling confirms the interpretation.

Second, the revised model appears to simplify the subsurface picture by combining earlier separate conductor interpretations into one broader system with multiple high-conductivity centres.

Third, the interpreted 11-degree south-west plunge may keep target positions relatively shallow as the system extends, which can be important for drilling efficiency and future resource geometry.

Fourth, Aruma now has a sequence of near-term catalysts that can keep the market focused on Tillex over coming months. Those include overdue but expected Phase 1 assays, further DHEM on historical holes, and a Phase 2 drill programme aimed at expansion.

Tillex is also located in the Timmins mining district in Ontario, a long-established mining region with a substantial exploration and mining history. While location alone does not determine project success, it can matter when assessing access to infrastructure, experienced contractors, and a known operating environment.

The Bigger Picture for the Tillex Copper-Silver Project

According to Aruma's announcement, the latest DHEM work represents a technical refinement rather than a change in project direction. The company is still in the exploration stage, but the update suggests that geophysics, historical drilling, and recent drilling are beginning to align into a more coherent model.

That can be an important step in copper project development. Before a company can move toward a resource estimate, it generally needs a clearer understanding of where mineralisation starts, how it continues, and which parts of the system deserve the next round of drilling capital.

At Tillex, the DHEM survey appears to have improved that picture considerably. With historical intersections already indicating substantial widths and solid copper grades, the next test for the market will be whether upcoming Phase 1 assays and Phase 2 drilling support further expansion of the conductor-linked mineralised corridor.

For now, the announcement positions Aruma Resources as an ASX copper explorer moving into a more data-driven phase at Tillex, with the south-west extension emerging as a key area to watch.

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