Javelin Minerals Hits Promising Gold-Copper Zone at 819m With Assays 8 Weeks Away
Key Takeaways
- Javelin Minerals completed its first deep diamond hole at Coogee North (CODD001a) to 819.8m, intersecting a 200-metre zone of hydrothermal alteration with chalcopyrite and pyrite sulphides from 529.12m to ~731m depth.
- The modelled magnetic anomaly — interpreted as a large intrusive body at approximately 600m depth — was not intersected, with Javelin now planning a wedge or extension hole to better target the anomaly core.
- Assay results from CODD001a are expected in 8–10 weeks, representing the next material catalyst for the stock.
- The rig has moved to Coogee West, where CODD002 is drilling towards a 1,000m target at a separate geophysical anomaly with coincident historic bedrock gold anomalism.
- Both holes are co-funded through the WA Government Exploration Incentive Scheme, reducing Javelin's direct capital exposure on a program targeting ground beneath an existing 126,685 oz Au JORC Mineral Resource.
Coogee North deep hole delivers promising geology as assays await
Javelin Minerals (ASX: JAV) has completed its first deep diamond hole, CODD001a, at the Coogee North gold-copper target located 55km south-east of Kalgoorlie, Western Australia, reaching a total depth of 819.8m. The hole intersected a highly altered and deformed geological zone consistent with the historic Coogee open pit sequence, a result the company describes as highly promising. Assays are expected in 8–10 weeks, and the rig has already moved to the second target, Coogee West.
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What the drill core revealed at Coogee North
Geological logging of CODD001a identified a large zone of brittle faulting and brecciation with moderate to strong hydrothermal alteration running from 529.12m to approximately 731m downhole. The alteration suite progresses from hematite-epidote to hematite-silica and magnetite, accompanied by abundant quartz and quartz-carbonate veining, with variable disseminated and blebby sulphides including pyrite and chalcopyrite.
Key geological observations from the hole include:
- Porphyritic dacite dykes, 5–30m wide, intruding the volcanic host sequence with a distinct hematite-epidote-carbonate alteration halo at contacts
- Pervasive hematite-epidote alteration progressing to hematite-silica-magnetite through the major altered zone
- Abundant quartz and quartz-carbonate veining throughout the hydrothermal system
- Disseminated and blebby pyrite and chalcopyrite sulphides present from relatively shallow depths through to total depth
- Large interval of brittle faulting and brecciation from 529.12m to ~731m downhole
Despite this promising picture, downhole magnetic susceptibility data indicates the source of the modelled magnetic anomaly has not yet been identified. Javelin believes the anomaly is either below or to the side of the hole, and the company is now evaluating and planning an extension and/or wedge hole to test the core of the modelled magnetic anomaly.
Understanding deep intrusive gold-copper targets, and why they matter
A magnetic anomaly is a zone where the earth’s magnetic field is stronger than the surrounding area, typically caused by a concentration of magnetite-bearing rock underground. Exploration geologists use airborne magnetic surveys to detect these zones and model them as potential intrusive bodies sitting deep beneath the surface. At Coogee North, the modelled anomaly is interpreted as a large intrusive body sitting at approximately 600m depth, directly beneath the existing Coogee North Mineral Resource.
Intrusive-related gold-copper systems form when magmatic fluids from an intrusive body carry metals upward, depositing gold and copper in surrounding rocks through hydrothermal alteration. The alteration patterns encountered in CODD001a, including magnetite-bearing zones and hematite-silica-epidote halos around dacite dykes, are regarded as indicators consistent with this style of mineralisation.
Importantly, the hole not reaching the magnetic source is not necessarily a negative outcome. The geometry of the alteration system suggests the hole may have passed over the top of a larger intrusive body, which would mean the magnetic core sits below or adjacent to CODD001a. This interpretation informs the design of an improved wedge or extension hole, giving the next drill test a better-constrained target.
The Coogee North anomaly sits directly beneath the existing JORC Mineral Resource, summarised in the table below.
| Resource | Classification | Weathering Zone | Tonnage (t) | Grade | Contained Metal |
|---|---|---|---|---|---|
| Gold | Indicated | Supergene | 15,816 | 1.17 g/t Au | 593 oz Au |
| Gold | Indicated | Fresh | 947,426 | 1.31 g/t Au | 39,969 oz Au |
| Gold | Inferred | Supergene | 24,601 | 0.56 g/t Au | 445 oz Au |
| Gold | Inferred | Primary | 2,666,988 | 1.00 g/t Au | 85,677 oz Au |
| Gold | Total | All zones | 3,654,831 | 1.08 g/t Au | ~126,685 oz Au |
| Copper | Inferred | Primary (within Gold Domain) | 330,366 | 5,546 ppm Cu | 1,832 t Cu |
| Copper | Inferred | Supergene | 271,745 | 3,619 ppm Cu | 983 t Cu |
| Copper | Inferred | Primary (without Gold Domain) | 415,494 | 3,144 ppm Cu | 1,306 t Cu |
| Copper | Total | All zones | 1,017,606 | 4,103 ppm Cu | 4,122 t Cu |
Source: Javelin Minerals ASX announcement, 1 October 2026. Gold resource reported at a 0.5 g/t Au cut-off; copper resource reported at a >2,000 ppm Cu cut-off. Resource estimate as of July 2024.
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Two-hole program advances as Coogee West drilling begins
CODD001a was drilled as part of a two-hole program co-funded through the WA Government Exploration Incentive Scheme (EIS), with Westralian Diamond Drilling of Kalgoorlie as the drilling contractor. The rig has now shifted to the second hole, CODD002, targeting a separate geophysical anomaly at Coogee West with a planned depth of 1,000m.
Both Coogee North and Coogee West anomalies are untested by previous deep drilling, with coincident bedrock gold anomalism identified in historic shallow RC and aircore drilling at both targets. The next steps for the program are:
The Coogee West geophysical targets were identified through the same multi-survey process that flagged Coogee North, with coincident bedrock gold anomalism in historic shallow drilling providing additional confidence that CODD002 is testing a structurally meaningful zone.
- Assay results from CODD001a, expected in 8–10 weeks
- Petrographic analysis of selected core samples from CODD001a
- Evaluation and planning of an extension and/or wedge hole at Coogee North to test the core of the modelled magnetic anomaly
- Coogee West deep hole (CODD002), currently drilling towards a 1,000m target depth
For investors, the setup is two large, untested magnetic targets, with Coogee North sitting beneath an existing JORC Mineral Resource, with EIS co-funding reducing Javelin’s direct cost exposure. Assay results from CODD001a represent the next material catalyst, with the geological intersections providing an encouraging foundation for what those results may show.
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