Downhole Electromagnetic Survey Commences at Gulf Creek Copper Project – Is this a Time For Position An Investment in OD6 Metals Limited?
- Noel Ong
- 1 day ago
- 6 min read
Announcement
Down Hole EM Survey Commences at Gulf Creek Copper Project 5 December 2025 (click here to view the announcement)
OD6 Metals Ltd (ASX: OD6) has commenced a Downhole Electromagnetic (DHEM) survey at the Gulf Creek Copper Project, located near Barraba in northern New South Wales (Figure 1). The program marks a significant technical step forward in assessing the project’s volcanogenic massive sulphide (VMS) copper potential, following the completion of four diamond drill holes and earlier reverse-circulation (RC) drilling completed in 2025.
Figure 1: Location of Gulf Creek Copper Project (source: OD6)
The Business of the Company: Focus – Projects
OD6 continues to advance its dual-commodity strategy:
Splinter Rock Rare Earth Project (WA) – a large-scale clay-hosted REE system with demonstrated metallurgical recoveries via heap leach and nanofiltration technologies.
Gulf Creek Copper-Zinc Project (NSW) – a historical high-grade copper mine with strong geophysical signatures suggesting the presence of deeper and potentially untested VMS systems.
This announcement focuses on the copper asset and OD6’s systematic technical approach to defining drill-ready targets beneath and beyond historic workings.
Highlights – DHEM Survey to Vector the Next Phase of Copper Drilling
High-Priority DHEM Survey to Target Massive Sulphide Extensions
DHEM surveying will commence over the weekend, utilising four recently completed diamond drill holes and earlier RC holes to detect conductive anomalies indicative of massive sulphide copper targets (Figure 2).
Figure 2: Plan overview of the 7 holes planned to have DHEM (source: OD6)
Mitre Geophysics designed the program and is being executed by Gap Geophysics Australia, with final processed results expected early in the New Year.
Phase 2 drilling has no diamond holes at Big Bend, Northwest, West Limb, and below the historic Gulf Creek Mine (Figure 3).
Figure 3: Plan view of OD6 Drilling completed to date overlain on 1st vertical derivative of magnetics with \ the priority targets Big Bend, North West, West Limb, and the historic Gulf Creek Mine (source: OD6)
Drilling has confirmed:
interbedded sedimentary and exhalative chert horizons,
hydrothermal alteration typical of VMS systems,
minor sulphides and hydrothermal magnetite,
alignment with a Besshi-style VMS model.
All holes were designed to enable DHEM acquisition to model off-hole conductors that may represent massive sulphide lenses not intersected by drilling (Figure 4).
Figure 4: Long section illustrating magnetic modelling and subsurface targets. (source: OD6)
Drilling will temporarily pause to allow acquisition and interpretation so that 2026 drilling can be more efficient and targeted.
Approvals remain in place for up to 25 holes / ~7,500m of drilling (Table 1).
Table 1. Drill Hole Details. All coordinates in GDA94 Zone 56.
Leadership Commentary
Managing Director Brett Hazelden commented:
“The commencement of DHEM surveying marks the next important step in unlocking the copper potential at Gulf Creek. This technique has a strong track record of identifying high-grade sulphide bodies that drilling alone may miss. With multiple holes now completed across several target zones, we are well-positioned for the DHEM survey to guide our next phase of drilling in 2026.
We are pleased to have drilled the previously untested Big Bend, West Limb and Northwest targets, all of which confirmed the presence of VMS-style stratigraphy. This provides strong encouragement for ongoing exploration targeting.
Gulf Creek continues to complement our flagship Splinter Rock Rare Earth Project by providing OD6 with exposure to a high-grade copper asset in a proven district at a time when copper prices are at record highs.”
About the Project
The Gulf Creek Copper Project (EL8492) lies within a historically productive district where the Gulf Creek Mine produced exceptionally high-grade copper (2–6.5% Cu) in the early 1900s. Remarkably, little modern exploration has occurred over the past century.
Gulf Creek mineralisation is associated with:
Besshi-style VMS systems,
chalcopyrite-sphalerite massive to semi-massive sulphides,
exhalative cherts, siltstones, and basalts,
strong magnetite association enabling geophysical targeting.
The 2025 drilling program (GCDD007–010) targeted magnetic/gravity anomalies modelled at depths of 100–600m, with hole depths ranging from 240.5m to 328m. These holes now form the backbone of the DHEM survey.
Near-term Milestones to Watch
Processed DHEM Results (Early New Year)
– ranking of conductive responses across Big Bend, West Limb, Northwest, and Gulf Creek Mine lodes.
Target Prioritisation for 2026 RC Drilling
– RC drilling preferred as the next phase due to faster and more cost-effective penetration once off-hole conductors are defined.
Laboratory Analyses of Diamond Core
– samples are being finalised for dispatch.
Further Geophysical Integration
– including modelling of conductors located within 100m of drill holes to support vectoring toward massive sulphides
Samso Concluding Comments
One of the reasons I am following OD6 with intent is that I believe that the investment case for OD6 is now significantly enhanced with its "Near To" production Rare Earth story and the potential of finding a VMS here at Gulf Creek. The value proposition for ASX investors should now be a definite SamsoDYOR.
AS the Gulf Creek narrative continues to develop along a technically credible pathway with the commencement of DHEM, the search for the ingredients for a VMS system is the excitement. DHEM is particularly valuable in a structural environment like Gulf Creek, where conductive sulphide lenses may sit just metres to tens of metres off existing drill traces. The historical mining is evidence that these sulphides exist. Defining and realising scale will make this venture "easy". We know that this is not easy, but I hope my point is taken, metaphorically.
Many important VMS discoveries globally were made only after downhole surveys revealed conductors that drilling narrowly missed. OD6 now stands at that inflection point—where each conductor identified can immediately be ranked, tested, and incorporated into a refined drill plan.
Finally, Gulf Creek offers diversification alongside Splinter Rock without detracting from OD6’s core strategy. The Company’s ability to progress a world-class rare earth system while methodically exploring a high-grade copper district speaks to its capability and technical breadth. Investors should watch the upcoming DHEM results closely, as they may redefine the forward exploration trajectory in the New Year.
Market Participation
One of the indications for me is the rising valuation of the shares and the market capitalisation, which is now almost AUD $16M. Figure 5 below shows what is a potential upward movement of value as the share price has been buoyant since the middle of 2025.
Figure 5: The OD6 share price chart as of 22nd December 2025. (source: CommSec)
There is no mistake in thinking that there is no sure thing in investments, and I think that OD6 is now seriously carrying two potential "wins"; this makes the bet safer. If the Rare Earth story takes off, the value creation is obvious. A good result from the survey will enhance the chances of drilling what could be a mineralised VMS in an area where infrastructure is abundant, and the cost of production is significantly reduced.
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