⚒️ Southern Hemisphere Mining Limited reports that the final assay results have been received from diamond drillhole 26LHDD073 at the Southern Porphyry Target within the Llahuin Project Joint Venture with FMR Resources in Chile.
The assay results follow the previously announced results at Targets A, C, and K. Results confirm broad copper-gold-molybdenum anomalism associated with porphyry intrusive phases and stockwork breccias. Significant intervals include: 24m @ 0.14% CuEq from 156m and, 4m @ 0.78% CuEq from 582m.
Drillhole 26LHDD073 was designed to test structural, geological and geochemical vectors interpreted from previous drillholes 25LHDD070, 25LHDD071 and 26LHDD072. The hole intersected multiple porphyry intrusive phases, broad zones of stockwork veining and pervasive hydrothermal alteration.
- Final assay results received from drillhole 26LHDD073 at Target L, Southern Porphyry.
- Assays confirm broad copper-gold-molybdenum anomalism associated with porphyry intrusive phases and stockwork breccias.
- Significant intervals include:
- 24m @ 0.14% CuEq from 156m
- 4m @ 0.78% CuEq from 582m.
- Assays support geological interpretation that drilling has intersected the mineralised intrusive footprint of an extensive porphyry system.
- Integration of assays, petrography and multi-element geochemistry is ongoing to vector toward higher-grade porphyry core for Phase II drilling.
FMR Resources Managing Director, Mr Oliver Kiddie, commented:
“The assays from Target L validate the geological observations from drilling, confirming a broad mineralised porphyry system containing copper, molybdenum, and gold anomalism associated with intrusive phases and stockwork breccia. Importantly, the geochemistry supports our interpretation that drilling to date has intersected the margins of an extensive porphyry system rather than the higher-grade core. Integration of the assays with structural, petrographic and geophysical datasets is continuing to refine vectors for Phase II drilling.”
Drillhole 26LHDD073 was designed to test structural, geological and geochemical vectors interpreted from previous drillholes 25LHDD070, 25LHDD071 and 26LHDD072. The hole intersected multiple porphyry intrusive phases, broad zones of stockwork veining and pervasive hydrothermal alteration.
Figure 1. Plan view of Southern Porphyry, showing surface projections of geophysical models, mapped epithermal veining at surface, and planned drill targets*.
Geological Context
26LHDD073 The key assay intervals are associated with mineralised porphyry intrusive phases, quartzsulphide stockwork breccia and veining logged during drilling. Visible chalcopyrite and molybdenite were identified in quartz–sulphide, magnetite–sulphide and anhydrite veinlets throughout the drillhole (see ASX announcement dated 30 March 2026).
Figure 2. Cross section L-L’, Target L – 26LHDD073, showing geophysical models, significant intercepts, and completed drillhole to 1,068.0m downhole depth
Geological interpretation continues to indicate that existing drilling has intersected the edges of an elongate mineralised porphyry intrusive corridor. Structural measurements from Target L demonstrate increasing vein complexity relative to earlier drilling, interpreted to reflect proximity to the porphyry fluid source.
Multi-element geochemistry, whole-rock geochemistry, and petrophysical and petrographic studies are continuing to refine vectors toward the interpreted higher-temperature coppermolybdenum core of the Southern Porphyry system.
Figure 3. Hydrothermal alteration zones associated with porphyry copper deposits (modified after Lowell & Guilbert 1970) with interpreted locations of completed FMR drillholes 25LHDD070, 25LHDD071, 26LHDD072 and 26LHDD073.
Whole-Rock Geochemistry and Petrography
Thin-section petrography of key lithologies and alteration assemblages is ongoing to characterise mineral relationships, alteration zoning and paragenesis, contributing to the reconstruction of porphyry system geometry. Geochemical analysis of anhydrite–pyrite samples continues.
Multi-element geochemical data are being analysed in conjunction with petrographic observations to identify alteration patterns and elemental associations indicative of proximity to the porphyry core. Integration of these datasets will assist in refining geochemical vectors and prioritising subsequent drill targeting within the Southern Porphyry system.
Geophysical and Petrophysical Studies
Downhole geophysical datasets from 25LHDD070, 25LHDD071, 26LHDD072 and 26LHDD073 are continuing to be interrogated against the existing surface IP and MT geophysical models. The work focuses on understanding the relationships between sulphide mineralisation, alteration assemblages, and the geophysical responses observed across the Southern Porphyry system.
Selected samples representing key lithologies, alteration styles, and sulphide assemblages have also been submitted for petrophysical testwork, including density, magnetic susceptibility, resistivity, and chargeability measurements. Integration of these datasets will refine the current geophysical inversion models and improve drill targeting for the next phase of drilling planned for Q4 2026.
Geological Setting
The Southern Porphyry target is located within a six-kilometre-long mineralised corridor within 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:
• Continue interpretation of multi-element geochemistry and petrography
• Complete integration of geological and geophysical datasets from Targets A, C, K and L
• Refine three-dimensional porphyry model and vectoring interpretation
• Finalise Phase II drill targeting the interpreted porphyry core
Figure 4. Southern Porphyry target area within the Llahuin Project Joint Venture concessions.
The Full PDF is available below.
News Release
Date: 01 June 2026 | 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 Project, both of which were discovered by the Company.
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