Coda Minerals Ltd
- ASX Code: COD
- Market Cap: $53,216,880
Coda Minerals Eyes Shallow Copper Upside at Oakden as Elizabeth Creek Development Advances
Coda Minerals Oakden shallow copper drilling at Elizabeth Creek represents the company's latest step in building out its South Australian copper development pipeline. Coda Minerals (ASX: COD) has announced plans to commence a focused reverse circulation (RC) drilling programme at its Oakden prospect, located approximately 15km south-southwest of the MG14 Mineral Resource within its Elizabeth Creek Copper Project in South Australia. The programme is designed to test shallow copper mineralisation identified by historical drilling, with the potential to add an early-stage feed source that could complement the company's existing development pipeline.
According to the announcement, the drilling comes as Coda simultaneously advances hydrogeological drilling across the broader project and progresses key Pre-Feasibility Study (PFS) workstreams, with approximately $11.6 million cash at bank following completion of Tranche 2 of its May 2026 placement.
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What Is Oakden and Why Does It Matter?
Oakden is an early-stage copper exploration prospect situated within tenure acquired by Coda in late 2023. Historical drilling at the site, conducted by Pacminex in 1974 and Cobalt Resources NL in the 1990s, identified copper mineralisation hosted in the Tapley Hill Formation black shale at relatively shallow depths.
The most significant historical result is drillhole OK36, which returned 6.0m at 0.63% copper from 39m, including 3m at 1.15% copper from 39m. Coda has cautioned that this is a historical result and that detailed assay and quality assurance procedures are not available. The upcoming drill programme is designed specifically to test and determine the reliability and repeatability of this result.
Coda's geological interpretation suggests mineralisation trends broadly northwest-southeast, following the interpreted margin of the Tapley Hill Formation black shale. The company has identified a conceptual area of interest comprising a corridor up to approximately 400m wide that may extend for several kilometres along strike, though this interpretation remains conceptual until tested by drilling.
"Oakden is a focused, relatively low-cost opportunity to test shallow copper mineralisation close to our existing development project. We are taking advantage of having the hydrogeological rig on site to quickly test this area which is on tenure acquired in late 2023," said Chris Stevens, Chief Executive Officer of Coda Minerals.
The Strategic Logic Behind Shallow Feed Sources
The Oakden prospect sits within a broader development framework Coda has built around Elizabeth Creek. The company's flagship Emmie Bluff deposit is an underground resource, and underground mine development inevitably takes time before full production is established. During that period, delivering mill feed from open-pittable, shallow sources can improve project economics by supporting early cash flow and mill utilisation.
This is the same logic underpinning the role envisioned for the MG14 deposit, which at 1.83Mt at 1.24% copper (1.67% copper equivalent) is earmarked as a potential early open-pit feed source. Oakden, if historical copper intersections are confirmed and shown to have continuity, could potentially serve a similar function.
As Stevens noted in the announcement, "even a modest source of shallow material could provide potential early mill feed while underground development at Emmie Bluff is underway." It is worth emphasising, however, that Oakden remains at the earliest stage of exploration. No resource estimate exists, and the scale and economic characteristics of any mineralisation remain unquantified at this point.
A Two-Phase Exploration Approach
Coda has designed the Oakden programme in a staged, cost-disciplined manner. Rather than committing to a large campaign upfront, the company intends to use a small initial programme to validate historical data before deciding whether to expand.
Phase 1: Confirmation and Local Continuity
- Approximately 5 to 6 shallow RC holes in the immediate vicinity of OK36
- Approximately 300 to 400 metres of total drilling
- Objectives include replicating the historical mineralised intersection, testing continuity at distances of 50 to 200m, confirming the geological interpretation of the Tapley Hill Formation geometry, and determining whether a broader second phase is warranted
Phase 2: Testing the Broader Corridor (Subject to Phase 1 Results)
- Approximately 12 to 22 additional holes if Phase 1 results are supportive
- Designed to assess broader strike extent of mineralisation
- The interpreted corridor may extend more than 1km towards the southern tenement boundary and remains open to the north
Historical Drilling at a Glance
The table below summarises key historical drillhole results in the vicinity of the Oakden prospect that inform Coda's current interpretation.
| Hole | Tapley Interval (m) | Mineralised Cu Intervals (≥1,000 ppm) |
|---|---|---|
| OK36 | 3.5 | 6.0m at 0.63% Cu from 39m incl. 3.0m at 1.15% Cu from 39m |
| OK63 | 15 | 3.0m at 0.11% from 42m; 3.0m at 0.11% from 48m |
| OK109 | 14.3 | 1.0m at 0.34% from 38.5m; 0.5m at 0.13% from 42m; 3.0m at 0.32% from 48.5m |
| OK110 | 11.28 | Multiple low-grade intervals from 43.5 to 55m |
| OK111 | 6.95 | 1.0m at 0.27% from 47.5m; 1.5m at 0.26% from 50m |
| BD2 | 6 | 6.0m at 0.28% from 40.5m |
| BD1 | 2.5 | 4.0m at 0.11% from 45m |
| OK36D, OK60, OK61, OK62, OK92, OK107, OK108, OK112, BD4 | Nil | No significant intervals |
Coda notes a geological relationship worth watching: copper grades appear to strengthen where the prospective shale unit is narrower, towards its interpreted margin. A broadly similar relationship between stratigraphic geometry and copper distribution has been observed at Emmie Bluff, where some of the thicker and higher-grade mineralisation occurs where the prospective shale narrows. This observation shapes the targeting logic for the upcoming programme.
Hydrogeological Drilling Running Concurrently
While the Oakden programme is being prepared, hydrogeological drilling is already underway across the broader project. As of the announcement date, drilling at Windabout is complete and the rig has moved to Emmie Bluff. Two production bores and two monitoring bores are planned at Emmie Bluff, with one also serving a secondary exploration purpose.
The programme remains on track for completion in September 2026 despite minor weather-related delays. Furthermore, the Oakden RC programme will commence immediately after the hydrogeological rig completes its current work, making use of existing on-site equipment.
PFS Workstreams Continuing to Advance
Alongside the exploration activity, Coda continues to advance the PFS for Elizabeth Creek. The table below summarises the reported status across key workstreams.
| Workstream | Status |
|---|---|
| Non-process infrastructure tender | Awarded |
| Independent engineering, process infrastructure tender | Nearing award |
| Metallurgical process flowsheet design | Entering detailed reporting phase; results expected shortly |
| Tailings storage facility design | Advancing following field visit |
| Waste rock characterisation lab test work | Advancing on schedule |
| Mineral Resource Estimate feeding into mine design | Proceeding on time |
| LiDAR survey | Completed |
| Environmental Approvals Scoping Report | Formally gazetted |
Understanding the Elizabeth Creek Resource Base
To put Oakden's potential significance in context, it helps to understand the scale of what Coda already holds at Elizabeth Creek. The project hosts a substantial mineral resource across multiple deposits.
| Deposit | Category | Type | Tonnage | Cu Grade | Contained Cu |
|---|---|---|---|---|---|
| Emmie Bluff | Indicated | Zambian / underground | 37.5 Mt | 1.3% | 485,000 t |
| Emmie Bluff | Inferred | Zambian / underground | 2.7 Mt | 0.9% | 26,000 t |
| Windabout | Indicated | Zambian / open pit | 17.7 Mt | 0.8% | 136,100 t |
| MG14 | Indicated | Zambian / open pit | 1.8 Mt | 1.2% | 22,700 t |
| Cattle Grid South | Inferred | Breccia / open pit | 5.8 Mt | 0.6% | 36,000 t |
| Project Total | 65.5 Mt | ~705,800 t Cu |
The project also contains co-product credits of approximately 33,000 tonnes of cobalt, 28 million ounces of silver, and 75,000 tonnes of zinc across the resource base.
Oakden is not being positioned as a potential addition to this resource base at this stage, given it remains early-stage exploration. It does, however, sit within the same geological province and targets a similar style of mineralisation, which lends geological plausibility to the programme.
Understanding Key Geological Terms
What Is the Tapley Hill Formation?
Tapley Hill Formation is a sedimentary rock unit comprising dolomitic shales and dolarenites that hosts copper mineralisation across the Elizabeth Creek project area. The formation sits above older basement rocks, and fluid movement along this boundary is interpreted as a key mechanism for copper deposition.
What Is a Zambian-Style Copper Deposit?
A Zambian-style copper deposit is a type of sediment-hosted copper deposit characterised by layered mineralisation in reduced sedimentary rock sequences, named after the Zambian Copperbelt. This style is associated with mineralisation at Emmie Bluff, Windabout, MG14, and potentially Oakden.
What Is RC Drilling?
RC drilling (Reverse Circulation) is a drilling method that uses compressed air to bring rock chips to the surface through the drill rods, allowing rapid and relatively low-cost sample collection from shallow to moderate depths. This method suits the near-surface targets identified at Oakden.
What Is Stratigraphic Continuity?
Stratigraphic continuity refers to the extent to which a mineralised layer persists laterally across an area. Confirming continuity between drill holes is a first step in assessing whether a mineralised zone has potential economic scale.
What to Watch For
Near-term newsflow from Coda is expected to centre on several milestones flagged in the announcement.
- Oakden Phase 1 drilling results, the most immediate catalyst, with drilling to commence once the hydrogeological rig moves off site
- Hydrogeological programme completion, targeted for September 2026
- Metallurgical process flowsheet detailed report, with results described as expected shortly
- Process infrastructure engineering tender award, described as nearing completion
- Tailings storage facility and waste rock characterisation work, advancing in parallel
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Investment Thesis: Optionality Built on a Substantial Resource Base
Coda enters the Oakden programme with approximately $11.6 million cash at bank, a PFS programme underway across multiple workstreams, and a project resource base of 65.5 Mt hosting more than 705,000 tonnes of contained copper across multiple deposits.
The Oakden programme represents a relatively low-cost exploration exercise with defined optionality. The company is using existing on-site infrastructure, namely the hydrogeological rig, to limit incremental mobilisation costs. Consequently, a Phase 1 programme of 5 to 6 holes covering approximately 300 to 400 metres of drilling is a modest outlay relative to the potential upside if historical mineralisation is confirmed.
The strategic framing set out in the announcement is grounded in the practical challenges of underground mine development. Shallow, open-pittable copper brought into production early in a project schedule can influence project economics by bringing forward mill feed and cash flow during the early years of operation, ahead of underground development at Emmie Bluff reaching full production capacity. This is the same rationale underpinning MG14's role in the development plan.
Oakden's outcome is not assured. The historical data is limited, quality assurance records are unavailable, and the geological interpretation remains unvalidated by modern drilling, as Coda itself has acknowledged. However, the combination of an existing resource base, an advancing PFS, a funded balance sheet, and a low-cost exploration programme targeting a specific gap in the project schedule nonetheless makes this a development worth following closely.
The Coda Minerals Oakden shallow copper drilling at Elizabeth Creek adds a compelling exploration thread to an already substantive copper development story. With over 705,000 tonnes of contained copper across a 65.5 Mt resource base and a PFS advancing on multiple fronts, the Oakden programme could support the early economics of a project designed around maximising value in its first years of production. With drilling results, engineering tender outcomes, and metallurgical reporting all expected in the near term, investors have several catalysts to monitor.
Want to Know More About Coda Minerals and the Elizabeth Creek Copper Project?
With a 65.5 Mt resource base, an advancing Pre-Feasibility Study, and a newly identified shallow copper exploration target at Oakden, Coda Minerals (ASX: COD) is building out a compelling copper development story in South Australia. To learn more about the company, its projects, and the investment case, visit www.codaminerals.com.
