OD6 Metals (ASX:OD6) flags off hole conductors at Gulf Creek after DHEM modelling

OD6 Metals has reported the processing and interpretation results from a Downhole Electromagnetic survey completed in December 2025 at the Gulf Creek Copper Project in northern New South Wales, with modelling identifying a strong off hole conductor and pointing to drill targeting beneath and around historic copper workings.

Highlights

• DHEM surveying results complete across 6 drill holes using 4 surface EM loops
• Strong conductor identified approximately 75m beyond the end of hole GDD010
• Geological reinterpretation indicates a potential fault offset of historic high grade lodes mined
• DHEM results at the Northwest Target indicate a possible additional conductor
• Drill assay results pending from the recent diamond drilling program
• OD6 fully permitted for an additional 25 holes at Gulf Creek follow up drilling

Gulf Creek is described as a base metal system where copper and zinc mineralisation occurs as massive to semi massive sulphides, principally chalcopyrite and sphalerite, and where mineralisation is closely associated with magnetite.

The host sequence comprises cherts, exhalative sediments and basalts of the Bob’s Creek Formation, with the mineralisation considered to be a Besshi Style Volcanogenic Massive Sulphide deposit.

The sedimentary sequence has been folded into northwest southeast striking and steeply dipping structures, and at the historic Gulf Creek mine the mineralised lodes strike northwest southeast and dip steeply at 70 to 85 degrees to the northeast.

The DHEM program utilised surface electromagnetic loops with downhole probes to detect conductive sulphide bodies beyond existing drill intersections.

The method is described as capable of identifying off hole conductors, down dip and along strike extensions of mineralised lodes, stacked or parallel lenses, and the depth and orientation of conductive bodies, with detection ranges of approximately 50m to 100m from the drill hole.

A total of 4 EM surface loops were laid out over key target areas, with 6 holes surveyed, including 3 at Gulf Creek and 1 each at Big Bend, West Limb and the Northwest Target.

The results confirmed conductors associated with known high grade mineralisation proximal to the historic mine workings.

The most material outcome is the identification of a strong off hole conductor located approximately 75m beyond the end of deep diamond hole GDD010, which was drilled to an end of hole depth of 328m beneath the old mine.

Hole GDD010 intersected only minor sulphide horizons and did not cut the known mine stratigraphy, including the main hanging wall exhalite jaspilite or the footwall basalt.

However, the upper part of the hole logged silicified material that is interpreted as potentially representing a fault zone.

The DHEM response indicates a conductive body positioned beyond this structure, supporting a geological interpretation of a fault offset that steps mineralisation to the southwest from a fault inferred to strike parallel to the Gulf Creek syncline and to dip to the southwest.

OD6 Metals Managing Director Brett Hazelden said

“The DHEM survey and subsequent modelling has provided confidence that there are significant undiscovered accumulations of mineralization proximal to the historic high-grade copper mine at Gulf Creek. Both our near-mine drilling and historic records indicate the presence of high grade copper, and this combined with the increased knowledge of mine-stratigraphy and the newly identified conductor located beyond end-of-hole, strongly suggests there is a structural fault off-set of the main lode. With drilling now logged and geological understanding significantly advanced, we believe this conductor represents a high-priority target at depth and reinforces the prospectivity of the project.”

At the Northwest Target, the DHEM survey identified a possible additional conductor, although the company states that this requires further geological consideration before drill testing.

In contrast, the surveys at Big Bend and West Limb did not return appreciable off hole conductors.

The company’s stated next steps include the receipt of assay results from the recent diamond drilling program, integrated interpretation of DHEM data with geology, surface geochemistry and geophysics, and the design of follow up drill holes to test the identified conductors.

OD6 has confirmed that it is fully permitted for an additional 25 drill holes at Gulf Creek, providing the regulatory capacity to advance the next phase of drilling once the pending assays and integrated technical interpretation are complete.

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