⚒️ Southern Hemisphere Mining Limited reports phase I diamond drilling has commenced at the Southern Porphyry Copper Target within the Llahuin Copper-Gold-Moly Project in Chile.

HIGHLIGHTS

  • ~4,000m program of directional drilling across ~3 months
  • First hole at Target A is planned for 1,600m, with capacity for multiple daughter holes;
  • ~5 weeks to complete
  • Downhole geophysics to be completed on all drillholes to refine existing 3D geophysical models and identify new targets
  • • Assay results expected 4–6 weeks after completion of each drillhole

Figure 1. Diamond drilling underway at Target A at Llahuin’s Southern Porphyry

From JV partner FMR Resource’s release:

FMR is pleased to advise that all statutory approvals have been received and the maiden drilling program has now commenced at the Southern Porphyry target within the Llahuin Project Joint Venture with Southern Hemisphere Mining Limited (ASX: SUH), Chile.

The Phase I program will comprise approximately 4,000 metres of diamond drilling over the next three months, which is designed to provide an initial test of what is interpreted as a large porphyry copper system. The program is designed to test integration of geophysical modelling of magnetics (MAG), magnetoterllurics (MT), and induced polarisation (IP), surface geological mapping and re-logging of historic drillholes.

Combined, these datasets highlight the potential for both shallow epithermal mineralisation and a deeper porphyry copper system. Assays from the first hole are expected approximately 4–6 weeks after completion, with results from subsequent holes to be reported progressively as the program advances.

FMR Managing Director, Mr Oliver Kiddie, commented:

“The commencement of our maiden drilling program at the exciting Southern Porphyry target marks another significant milestone for FMR. Since announcing the Llahuin Project transaction on the 16th June this year, we have moved at rapid pace to deliver our maiden drilling program 3 months later. “Our first drillhole at Target A, planned to 1,600 metres, will provide the first real test of the geophysical models and the potential of what we interpret as a large-scale porphyry copper system. With directional drilling capability, downhole geophysics, and the flexibility to immediately follow up on any mineralisation encountered, the program is designed to maximise the geological information we collect and ensure we can respond quickly to results. The data from Target A will be critical in refining our understanding of the system and guiding the next stages of drilling.”

View the Full PDF of the ASX Announcement
Target A
The first drillhole, now underway at Target A, is planned to 1,600 metres downhole depth and will test relatively shallow IP and MT features interpreted to relate to the Santa Maria epithermal vein system, before continuing to test a large, high-amplitude MT anomaly at depth. The hole has been designed with directional drilling capability, providing the option for multiple daughter holes from the same platform. If significant mineralisation is intersected at Target A, additional follow-up holes may be planned from the Target A pad and prioritised ahead of moving to Target D, where a 1,000m drillhole is planned to test both near-surface IP/MT features and a deeper MT anomaly.

Figure 2. Plan view of Southern Porphyry, showing surface projections of geophysical models, and planned drilling.

As part of the program, all holes will be logged with downhole geophysical instruments including induced polarisation, electromagnetic conductivity, and spectral gamma. This work will provide important constraints to reconcile and refine the existing 3D geophysical models to improve drill targeting, as well as identifying new drill targets*.
* Refer to FMR ASX announcement dated 26 August 2025

Figure 3. 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 4. Southern Porphyry target area within the Llahuin Project Joint Venture concessions*

Geological Setting
The Southern Porphyry target is located within a six-kilometre-long mineralised corridor with the Llahuin Project, which hosts multiple copper–gold–molybdenum porphyry centres (see Figure 4). Field mapping completed in June and July 2025 identified argillic alteration, silicification and epithermal quartz veining at the surface, along with zones of secondary copper mineralisation assemblages typical of the upper levels of a copper porphyry system. * Re-logging of historic drillholes confirmed these features at depth, with intervals showing hydrothermal alteration, silicification, and disseminated chalcopyrite–pyrite mineralisation. These observations suggest a telescoped system, characterised by epithermal-style veining and alteration preserved above a deeper porphyry core.* * Refer to FMR ASX announcement “Phase I Drilling Target Areas Refined at Southern Porphyry” dated 9 July 2025
Next Steps
  • Complete drilling of Target A parent drillhole (~5 weeks)
  • Downhole geophysics to be undertaken progressively on each drillhole
  • Report assays and material observations as results become available
  • Determine follow-up drilling priorities, including potential additional drillholes

The Full PDF is available below.

View the Full PDF of the ASX Announcement
Competent Persons Statement
The information in this announcement that relates to Exploration Results, Geophysical Results and Interpretations is based on information compiled by Mr Luke Marshall, who is a Member of the Australian Institute of Geoscientists. Mr Marshall is a Consultant to FMR Resources Limited. Mr Marshall has sufficient experience relevant to the style of mineralisation and type of deposit under consideration, and to the activity being undertaken, to qualify as a Competent Person as defined in the 2012 Edition of the “Australasian Code for Reporting of Exploration Results, Mineral Resources and Ore Reserves” (JORC Code). Mr Marshall consents to the inclusion in this announcement of the matters based on their information in the form and context in which it appears.
The information in this announcement that relates to previously reported Exploration Results is extracted from announcements titled: “Phase I Drilling Target Areas Refined at Southern Porphyry” dated 9 July 2025 “Geophysical Remodelling Confirms Compelling Drill Targets at Southern Porphyry” dated 13 August 2025 “Southern Porphyry Phase I Drill Targets Finalised” dated 26 August 2025

News Release
Date: 23 September 2025 | ASX Code: SUH | Frankfurt Exchange: NK4

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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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