Briggs Drill Hole 25BRD0037 Hits 810m Confirming Porphyry Copper Mineralisation

Drilling Milestone at Briggs

Alma Metals Limited has successfully completed its deepest diamond drill hole to date at the Briggs Copper Project in Queensland, reaching a down-hole depth of 809.9 metres. This hole, designated 25BRD0037, was designed to intersect the entire known mineral resource estimate (MRE) and to test a nearby geophysical anomaly identified by Versatile Time Domain Electromagnetic (VTEM) surveys.

Logging of the drill core has revealed porphyry copper-style mineralisation along the entire length of the hole, with the most intense copper mineralisation and alteration concentrated around the geological contact between the porphyritic granodiorite intrusion and the surrounding volcanic sediments at approximately 472 metres depth. This finding aligns closely with the pre-drilling geological model and validates the existing block model developed in April 2025.

Expanding the Exploration Footprint

Building on these encouraging results, Alma Metals has commenced a new drill hole, 25BRD0038, positioned 80 metres northwest of the previous hole. This step-out drill is targeting extensions below the peak of a surface copper-in-soils geochemical anomaly and aims to test the continuity of the stronger mineralised zones identified in 25BRD0037. The company anticipates that this hole will take up to three weeks to complete.

The drilling program benefits from partial funding through a $250,000 grant from the Queensland Government’s Collaborative Exploration Initiative, underscoring the strategic importance of the project within the region.

Assay Results and Project Outlook

Assay results for the upper 231 metres of hole 25BRD0037 have been dispatched to a Brisbane laboratory, with results expected within three weeks. The remaining core samples will be analysed over the following four to six weeks, with full assay data anticipated by December. These results will be critical in refining the mineral resource estimate and supporting ongoing metallurgical and technical studies.

Alma Metals’ Managing Director, Frazer Tabeart, highlighted the significance of the drilling outcomes, noting that the results not only confirm the geological model but also enhance understanding of the VTEM anomaly, which appears linked to narrow sulphide veins within the volcanic sediments. He emphasized the project’s strong positioning amid robust global copper prices and supply constraints, with the Scoping Study nearing completion to advance Briggs as a key contributor to Australia’s copper pipeline.

Strategic Advantages and Future Prospects

The Briggs Copper Project is notable for its large-scale, low-grade porphyry-style copper deposit, with a Mineral Resource Estimate containing approximately 2 million tonnes of copper metal. Its location near Gladstone port and proximity to existing infrastructure such as power lines, rail, and gas pipelines provide operational efficiencies that enhance the project’s economic potential.

Alma Metals currently holds a 51% interest in the project and is progressing toward increasing its stake to 70% through sole funding exploration and evaluation activities under a joint venture agreement with Canterbury Resources Limited. The ongoing drilling and forthcoming assay results will be pivotal in defining the resource’s scale and guiding the next phases of development.