Southern Porphyry Copper Target – 4,000m Phase 1 drilling program to commence September at Llahuin

⚒️ Southern Hemisphere Mining Limited reports that a 4,000m drilling program is scheduled to commence at Llahuin’s Southern Porphyry in late September 2025.

We look forward to testing this large deep target which could be an absolute game changer for the entire Llahuin Copper-Gold Project.

HIGHLIGHTS

• 4,000m Phase I drill program to test a compelling, large, undrilled copper porphyry system at the Llahuin Copper-Gold Project’s Southern Porphyry in Chile
• Program designed to test four high-priority targets (A–D), with scope for directional drilling and daughter holes from parent holes

The Phase I drill program is designed to test four high-priority targets (A–D) defined from recent geophysical remodelling. The program integrates aeromagnetic (MAG), magnetotelluric (MT), and induced polarisation (IP) datasets with surface mapping and relogging of historical drill holes, which together confirm the presence of alteration and mineralisation signatures typical of large copper porphyry systems.

Managing Director, Oliver Kiddie, commented:

“Awarding the drill contract is another major milestone for FMR. With Big Bear Drilling on board and site preparations advancing, we are now weeks away from drill testing what we believe is one of the most compelling undrilled copper porphyry targets in Chile. The ability to utilise directional drilling techniques will allow us to test this system with greater efficiency and precision.”

Figure 1. Plan view of Southern Porphyry, showing surface projections of geophysical models, and planned drilling.

The Phase I drill program will comprise approximately 4,000 metres of diamond drilling designed to gain an initial understanding of the scale and geometry of what is interpreted to be an extensive copper porphyry system. Target A and Target D have been prioritised for first pass testing, with planned hole depths of 1,600 metres and 1,000 metres, respectively (see Figure 1). Importantly, if significant mineralisation is intersected at Target A, the program has the flexibility to immediately drill follow-up holes from the same platform, rather than moving directly to Target D. Each drillhole is envisaged to take 3 to 5 weeks to complete , depending on depth of target, with the program expected to take ~3 months to complete. Samples will be submitted to ALS Santiago for assay on completion of each drillhole, with results expected 4 to 6 weeks post submission.

Figure 2. Cross section A-A’, Target A, showing geophysical models and proposed drillhole, planned to 1600m downhole depth, testing relatively shallow IP-RES features, interpreted to be related to the Santa Maria epithermal vein system, and a large MT high amplitude feature at depth (+/- 10m window).

Figure 3. Cross section D-D’, Target D, showing geophysical models and proposed drillhole, planned to 1000m downhole depth, testing relatively shallow IP and MT features near the surface, and a larger MT feature at depth (+/- 10m window).

Figure 4. Southern Porphyry target area within the Llahuin Project Joint Venture concessions*

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Southern Hemisphere Mining Limited is an experienced minerals explorer in Chile, South America.

Chile is the world’s leading copper producing country and one of the most prospective regions of the world for major new copper discoveries. The Company’s projects include the flagship Llahuin Porphyry Copper-Gold-Moly Project and the Los Pumas Manganese EV Battery Project, both of which were discovered by the Company.

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