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Gravity Survey Expands Red Hill Copper-Gold Potential for Azzuro Resources
Azzuro Resources (ASX: AZ9) has reported results from a constrained three-dimensional gravity inversion at its 100%-owned Red Hill (Maikhan Uul) Copper-Gold VMS Project in southwestern Mongolia. The Azzuro Resources Red Hill copper-gold gravity survey results point to a coherent high-density body extending approximately 240 metres below the deepest currently drilled mineralisation, alongside a separate high-density anomaly located 650 metres to the southwest of the main system, supported by surface rock-chip copper assays of up to 9.35% Cu.
The result materially expands the known footprint of the Red Hill system. It provides the company's first geophysically derived depth estimate for the down-plunge continuation of the massive sulphide body and directly informs the next drilling programme, scheduled to commence in August 2026.
"The gravity data inversion and interpretation is a very exciting development for the overall scale of prospectivity of the Red Hill copper-gold VMS project. A large depth extension below previously reported massive sulphide intercepts and a potential additional target in the SW area of the system will be priority targets for the next round of drilling to commence in August 2026," said Gan-Ochir Zunduisuren, Managing Director of Azzuro Resources.
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From Scattered Signals to a Single Coherent System
The initial processing of the ground gravity dataset, using a standard unconstrained model, produced a series of disconnected, discrete high-density bodies, some without any obvious geological explanation. According to the announcement, that picture has since been replaced by a more coherent interpretation.
By incorporating geological mapping, structural data, and drillhole intercepts from the 2025–2026 drilling programme, the constrained 3D inversion resolves those isolated signals into one continuous, elongated high-density body. This body is described as geologically coherent, spatially consistent with known massive sulphide intersections, and extending beyond the current limits of drilling.
The technical work was completed by Terra Resources Pty Ltd, an Australian geophysical consultancy, using density constraints derived from 247 specific gravity determinations on half-core samples from 10 of Azzuro's diamond drillholes (MU2501, MU2502, MU2601 to MU2605, MU2608, MU2609 and MU2610a).
The underlying gravity survey was conducted by DataMaster LLC and comprised:
- 1,041 stations covering approximately 3.79 square kilometres
- 50-metre spaced lines with 20-metre station spacing, reduced to 10 metres over priority areas
- Data collected using Scintrex CG-5 gravimeters with high-precision differential GNSS positioning
This level of resolution is described as providing a dataset suitable for 3D density inversion modelling, underpinning the confidence placed in the constrained result.
What the Constrained Inversion Reveals
According to the report, the constrained model delivers two key outcomes for Azzuro's exploration programme.
Does the Main Red Hill System Extend Further at Depth?
The primary high-density body identified in the constrained model correlates with known massive sulphide intercepts in drillholes MU2601, MU2501, MU2503, and MU2502, among others. The body continues approximately 240 metres below the MU2501/MU2601 intercept level, itself already approximately 110 metres below surface, before closing off at depth. This is reported as the company's first geophysically derived estimate of the down-dip extent of the mineralised system at this location.
Previously reported intercepts that correlate with the high-density body include:
| Drillhole | Interval | Cu | Au | Ag | Zn |
|---|---|---|---|---|---|
| MU2601 | 13.1m from 108.4m | 2.58% | 0.96 g/t | 22.44 g/t | – |
| MU2501 | 14.5m from 132.5m | 2.23% | 0.73 g/t | – | – |
| MU2603 | 21.45m from 83.2m | 1.70% | 0.85 g/t | 16.86 g/t | 0.21% |
These intercepts serve as geological anchors that support the constrained inversion approach, with the high-density anomaly and the known mineralisation occupying the same spatial position.
A New Southwest Target 650 Metres from the Main System
Beyond the drilled area, the constrained model defines a separate, coherent high-density anomaly located approximately 650 metres southwest of the main Red Hill massive sulphide system, measured as collar-to-collar distance from MU2611 to MU2601. The modelled dimensions of this body are reported at approximately:
- 190 metres in strike length
- 50 to 100 metres in width
- Extending to around 300 metres below surface
This target was not tested by drillhole MU2611, which was completed prior to the constrained inversion. The anomaly is interpreted to lie approximately 100 metres east and down-dip of that hole. Furthermore, the geological case for this target is supported by a nearby mineralised outcrop and surface rock-chip copper assays reported at 9.35% Cu, 4.14% Cu, 1.98% Cu, and 0.60% Cu from surrounding sample sites.
Moderate to strong hematite and jarosite alteration has also been recorded at surface, which the company notes is consistent with the presence of underlying sulphide mineralisation. Consequently, Azzuro considers this a target warranting incorporation into future drill planning alongside the down-plunge extension of the main system.
Understanding Constrained 3D Gravity Inversion
Gravity surveying measures subtle variations in the Earth's gravitational field caused by differences in rock density below the surface. Dense rocks, such as massive sulphides containing copper, gold, and other metals, create a measurable gravity signal detectable at surface.
A three-dimensional inversion takes surface gravity readings and mathematically works backwards to generate a model of where dense material must exist underground to explain those measurements.
An unconstrained inversion has no geological input. It simply finds the mathematically simplest explanation for the data, which can produce multiple possible solutions — some of which may not align with known geology. A constrained inversion, however, incorporates real geological data, such as surface mapping, structural interpretations, and drill core intercepts, to guide the mathematical solution toward outcomes consistent with what is already known about the deposit.
Glossary of Key Terms
| Term | Definition |
|---|---|
| VMS (Volcanogenic Massive Sulphide) | A deposit type formed on ancient seafloors where metal-rich fluids vented and deposited sulphide minerals rich in copper, gold, zinc, and silver |
| Massive Sulphide | Rock composed predominantly of sulphide minerals, typically dense and high-grade in base metals |
| Specific Gravity (SG) | A measure of rock density relative to water; sulphide-rich rocks generally have higher SG values than surrounding host rocks |
| Down-Plunge | The direction along which a mineralised body continues at depth, following its structural orientation |
| DHEM (Downhole Electromagnetic) | A technique where electromagnetic instruments are lowered into existing drillholes to detect nearby conductive bodies not intersected by the hole |
| Bouguer Anomaly | A gravity measurement corrected for topography and other effects to isolate the signal from subsurface density variations |
Constrained 3D gravity inversion is used across the exploration industry to help define drill targets ahead of costly drilling campaigns. Where the output correlates with known mineralisation — as reported here at the MU2601 and MU2501 sections — confidence in the model's predictive value tends to increase. The Azzuro Resources Red Hill copper-gold gravity survey results directly inform the next phase of drilling and expand the area of the system considered for testing.
Next Steps in the Exploration Programme
According to the announcement, the Azzuro Resources Red Hill copper-gold gravity survey results feed into a sequenced programme of further work.
| Activity | Timing |
|---|---|
| Downhole electromagnetic (DHEM) surveys on 2026 diamond drillholes | Commenced first week of August 2026 |
| Receipt and reporting of Batch 4 assay results (MU2609–MU2611) | Expected in approximately 3–4 weeks |
| Integration of DHEM, resistivity, and gravity data for drill targeting | Ongoing |
| Next round of drilling at Red Hill | Scheduled second half of August 2026 |
| Geophysical studies and drilling at Oval Cu-Ni project and other regional prospects | Q3 2026 |
The DHEM programme is highlighted as a complementary tool to the gravity work. Where gravity detects dense material, electromagnetic methods detect conductive material — and massive sulphides are typically both dense and conductive. Combining the two datasets is intended to provide a stronger basis for collar placement in the next drilling phase.
The company has also advised that certain routine QA/QC results for Batch 4 samples (MU2609 to MU2611) fell outside acceptable tolerances and have been submitted for re-analysis at ALS Group Laboratory in Ulaanbaatar. Azzuro states this delay does not affect the gravity inversion results reported in this announcement, which rely on geological and density data rather than assay grades, with confirmation expected within three to four weeks.
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Project and Jurisdictional Context
Azzuro's Red Hill project has progressed through a series of drilling campaigns since the company confirmed massive sulphide at the site in October 2025. According to the compliance history attached to the announcement, high-grade assays followed in November 2025, with multiple rounds of drilling through May to July 2026 extending the reported strike length of the system to 550 metres as at the 16 July 2026 announcement.
Mongolia hosts several established copper and gold deposits, including the world-class Oyu Tolgoi copper-gold system. Azzuro's licence (MV-019681) for Red Hill runs for a 30-year term to 2045 and covers 79.14 hectares. The licence was transferred to Azzuro's subsidiary, Innova Mineral LLC, in April 2026.
The company notes that the constrained gravity inversion result is interpretative and non-unique, representing its current best interpretation of the dataset. Drill testing will be required to confirm the presence, continuity, and grade of any mineralisation down-plunge of existing intercepts, and the model remains subject to ongoing review as further drilling data becomes available.
With drilling scheduled for the second half of August 2026, DHEM surveys underway, and Batch 4 assay results pending, the Azzuro Resources Red Hill copper-gold gravity survey results have established a number of clearly defined near-term technical milestones at Red Hill.
Want to Know More About Azzuro Resources and the Red Hill Copper-Gold Project?
With drilling scheduled for August 2026, a gravity-confirmed depth extension of 240 metres below existing mineralisation, and a newly defined southwest target supported by rock-chip assays of up to 9.35% Cu, Azzuro Resources (ASX: AZ9) is advancing Red Hill toward what could be a significant expansion of the known system. Investors looking to stay across upcoming DHEM results, Batch 4 assays, and the next drilling programme can find further details at www.asianbatterymetals.com.
