⚒️ Southern Hemisphere Mining Limited reports assay results from three Diamond Drillholes (25LHDD070, 25LHDD071 and 26LHDD072) completed at the Southern Porphyry Target.
- Results include:
- 124m @ 0.31% CuEq1 from 258m in 25LHDD071, including 20m @ 0.48% CuEq
- 104m @ 0.16% CuEq from 522m in 26LHDD072
The results confirm the presence of a large, vertically extensive porphyry-related hydrothermal system, with mineralisation defined by broad zones of gold–coppermolybdenum anomalism, extensive quartz–anhydrite veining, and hydrothermal brecciation (see Figures 2-6 and Appendix 1).
Importantly, interrogation of assay results through petrographic and lithogeochemical studies indicates that drilling to date has intersected fertile intrusive phases and a mineralised hydrothermal envelope, but has not yet intersected the causative porphyry intrusion or the higher-grade core of the system.
The Southern Porphyry target is within the Company’s Llahuin Copper Gold Moly Project in Chile, with the SP under Joint Venture with FMR Resources (ASX: FMR).
HIGHLIGHTS
- Assay results received for diamond drillholes 25LHDD070, 25LHDD071 and 26LHDD072 across Targets A, C, and K
- Results include:
- 124m @ 0.31% CuEq1 from 258m in 25LHDD071, including 20m @ 0.48% CuEq
- 104m @ 0.16% CuEq from 522m in 26LHDD072
- All holes intersected broad zones of gold–molybdenum–copper anomalism hosted within intensely altered and brecciated volcanic and intrusive rocks
- Petrographic and lithogeochemical studies confirm the presence of multiple fertile dioritic intrusive phases
- Lithogeochemical analysis indicates that while these intrusions are fertile, they do not represent the causative porphyry centre
- Elevated Au:Cu ratios and strong molybdenum anomalism indicate drilling is positioned above and/or peripheral to a porphyry core, which remains untested
- Results provide strong vectors toward a concealed porphyry centre, with integration of MT, IP, downhole geophysics, and geochemistry underway to design Phase II drill targets
FMR Resources Managing Director, Mr Oliver Kiddie, commented:
“These results confirm our visual observations that we have intersected the outer zones of a large and fertile mineralised system. Importantly, detailed petrographic and lithogeochemical analysis shows that while we are intersecting fertile intrusions, we have not yet drilled the causative porphyry.
“The strong gold component and increasing molybdenum give us confidence that we are positioned above or on the margins of the system, and that the core of the mineralised porphyry remains to be tested. The gold results are particularly encouraging, reporting higher than resource grades within the greater mineralised corridor at Llahuin.
“The FMR team is continuing to integrate new datasets to existing models to identify new drill targets across the Southern Porphyry target area. Once finalised, Phase II drilling will result in more focused drilling, targeting the interpreted mineralised core of this extensive system.”
Interpretation
Results from holes 25LHDD070–072, when integrated with petrographic and lithogeochemical analysis, define a large, vertically extensive porphyry system characterised by:
- Gold–copper–molybdenum anomalism
- Hydrothermal brecciation and crackle textures
- Quartz–anhydrite stockwork veining
- Multiple phases of porphyritic intrusive rocks Lithogeochemical fertility indicators demonstrate that several intersected dioritic intrusions are magmatically fertile, with compositions comparable to productive Andean arc systems.
However, the dominance of phyllic and sodic-calcic alteration, and the absence of a welldeveloped potassic core, indicate that drilling to date has not intersected the central mineralising intrusion.
The current drilling is therefore interpreted to have intersected a mineralised hydrothermal envelope developed above and/or peripheral to a concealed porphyry centre, supported by:
- Gold-dominant mineralisation (high Au:Cu ratios) indicating a higher-level position in the system
- Elevated molybdenum, particularly in hole 26LHDD072, indicating proximity to a porphyry source
- Presence of fertile but non-causative intrusive phases
- Increasing vein density and brecciation intensity
This style of mineralisation is consistent with porphyry systems where broad zones of Au–MoCu anomalism and brecciation occur above and peripheral to the main porphyry body.
This interpretation is consistent with recent exploration results reported by ATEX Resources Inc. (TSXV:ATX) at the Valeriano Project in Chile, where hole ATXD33 returned 198m @ 0.14% CuEq from 1,102m and 134m @ 0.13% CuEq from 1,554m, approximately 325m south of the main porphyry centre (see Figure 1).*
These intersections, comparable in scale and tenor to the results reported here, are interpreted as lying outside the core of the system, supporting the view that broad zones of anomalous mineralisation and brecciation occur peripherally to a large porphyry body.
Figure 1. Plan view of the ATEX Resources Inc. Phase VI drillholes, showing location of drillhole ATXD33 and breccia targets in relation to the main Valeriano porphyry* * Refer to ATEX Resources Inc.’s TSXV announcement dated 16 March 2026.
Figure 2. Plan view of Southern Porphyry, showing surface projections of geophysical models, mapped epithermal veining at surface, completed drill targets and assay results to date*. * Refer to FMR ASX announcements dated 9 July 2025, 26 August 2025, 23 October 2025, 10 November 2025, 25 November 2025, 3 December 2025, 3 February 2026, 10 February 2026, 26 February 2026, 5 March 2026, and 31 March 2026.
PHASE I – DRILLING RESULTS
25LHDD070
Hole 25LHDD070 intersected a complex sequence of andesitic volcanic rocks intruded by multiple phases of dioritic porphyry, with extensive hydrothermal brecciation and quartzanhydrite stockwork veining (Figure 3).
Petrographic and lithogeochemical studies confirm the presence of multiple intrusive phases, including porphyritic diorites hosted within volcanic and polymictic breccias. Intrusions intersected between approximately 100m and 450m downhole display geochemical signatures consistent with fertile arc magmas, overprinted by phyllic alteration (sericitechlorite–pyrite).
Alteration assemblages are dominated by phyllic to sodic-calcic styles, with a lack of welldeveloped potassic alteration, indicating that these intrusions are not the causative porphyry centre.
Mineralisation is associated with:
- Quartz–anhydrite stockwork veining
- Hydrothermal brecciation
- Disseminated pyrite ± chalcopyrite ± minor molybdenite
Key results:
- 10m @ 0.45% CuEq from 171m
- 1m @ 0.40% CuEq from 166m
These results are interpreted to represent peripheral mineralisation within the broader porphyry system.
Figure 3. Cross section A-A’, Target A – 26LHDD070, showing geophysical models and completed drillhole to 1,469.1m downhole depth, including mid-level shallow IP Resistivity and IP Chargeability features, and a large MT high amplitude feature at depth (+/- 10m window).
25LHDD071
Hole 25LHDD071 targeted the interpreted central portion of the Southern Porphyry system, intersecting a broad zone of intense quartz–anhydrite veining and hydrothermal brecciation within a pervasively altered intrusive sequence (Figure 4).
Petrographic analysis is pending at time of writing.
Key result:
- 124m @ 0.31% CuEq (0.18 g/t Au, 1.61 ppm Mo, 0.02% Cu) from 258m, including 20m @ 0.48% CuEq (0.29 g/t Au)
Mineralisation is characterised by:
- Gold-dominant tenor with minor copper
- Associated molybdenum anomalism
- Disseminated and vein-hosted sulphides
The strong gold component relative to copper, with associated molybdenum, indicates this intersection lies within the upper mineralised envelope of a porphyry system, rather than the higher-grade core.
Figure 4. Cross section C-C’, Target C – 26LHDD071, showing geophysical models and completed drillhole to 1,490.7m downhole depth, including mid-level shallow IP Resistivity and IP Chargeability features, and a large MT high amplitude feature at depth (+/- 10m window).
26LHDD072
Hole 26LHDD072, targeted with structural vein orientation data and geochemical vectors, intersected a strongly altered and brecciated sequence with widespread phyllic alteration and zones of intense quartz–anhydrite veining (Figure 5).
Petrographic analysis is pending at time of writing.
Key results:
- 104m @ 0.16% CuEq (46.64 ppm Mo) from 522m
- 14m @ 0.31% CuEq from 814m
- 14m @ 0.21% CuEq from 944m
- Notably, the elevated molybdenum values, together with persistent Au–Cu anomalism, indicate increasing proximity to a porphyry centre, despite modest copper grades.
Figure 5. Cross section K-K’, Target K – 26LHDD072, showing geophysical models and completed drillhole to 1,038.2m downhole depth, including mid-level shallow IP Resistivity and IP Chargeability features, and a large MT high amplitude feature at depth (+/- 10m window).
Figure 6. Hydrothermal alteration zones associated with porphyry copper deposit (modified after Lowell & Guilbert 1970) with interpreted locations of completed FMR drillholes 25LHDD070, 25LHDD071, and 26LHDD072.
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 7). 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
Figure 7. Southern Porphyry target area within the Llahuin Project Joint Venture concessions
Next Steps
- Review and integration of outstanding petrographic and lithogeochemical analysis
- Integration of assay results with petrology, structural data, MT, IP and downhole geophysical datasets
- Design of Phase II drill program targeting the interpreted porphyry core
- Phase II drilling to test higher-grade core positions at depth and along strike
The Full PDF is available below.
News Release
Date: 30 July 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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