⚒️ Southern Hemisphere Mining Limited reports highly encouraging mineralised indicators, as Phase 1 drilling nears the Southern Porphyry’s main target within the Llahuin Copper Gold Project in Chile.
Please refer to the below update by JV partner FMR Resources Limited.
- Shallow, mineralised epithermal veins intersected with up to 1.7% Copper, confirming the presence of a mineralised vein swarm within the upper Santa Maria epithermal system, providing a secondary shallow target
- In addition, highly encouraging mineralised porphyry indicators, including remobilised chalcopyrite veins and anhydrite-pyrite veins, intersected at multiple intervals downhole, above the primary target
- First drillhole 25LHDD0070 (Target A) now beyond 800m downhole depth and just above the main porphyry target
Figure 2. Cross section A-A’, Target A, showing geophysical models and proposed drillhole, planned to 1600m downhole depth, testing relatively shallow IP-RES and IP Chargeability features related to the Santa Maria epithermal vein system, and a large MT high amplitude feature at depth (+/- 10m window)*.
FMR is pleased to advise that assays have been received from near surface samples as drilling continues towards the main MT target at its maiden drillhole at Target A, Southern Porphyry, within the Llahuin Project Joint Venture, with Southern Hemisphere Mining Limited (ASX: SUH), Chile.
Managing Director, Mr Oliver Kiddie, commented:
“Intersecting a mineralised copper-gold epithermal zone so early in our maiden drillhole is an exciting early result. This validates the interpretation of the Santa Maria epithermal system being mineralised and extending below surface and further strengthens our confidence of a mineralised porphyry copper target at depth driving a larger system. As our first drillhole steadily advances past 800m toward the large MT anomaly, we are highly encouraged by the key indicators we are encountering in the drillcore. The presense of remobilised chalcopyrite in veining and zones of anhydrite-pyrite within the zoned alteration assemblages have the geological team genuinely excited as to what the MT anomaly represents at depth.”
Near Surface Epithermal Mineralisation
The current drillhole 25LLDD0070 intersected an interval of epithermal veining and shear-hosted mineralisation between 171.6m and 180.6m downhole. Sample results have been received from this interval, including a peak result of 1.7% Cu (see Figures 1 and 2 and Table 1). This intercept provides early confirmation of a mineralised epithermal system extending below surface. First mapped over 500m in outcrop during field programs in June and July 2025, this first drill intercept supports the broader model of a telescoped copper–gold porphyry system at Southern Porphyry. This adds further weight to the magnetic and magnetotelluric anomalies being representative of a porphyry core at depth, driving the shallow epithermal system.
Key Indicators Identified as Drilling Continues
The maiden drillhole at Southern Porphyry, 25LLDD0070, continues at the time of writing. The drillhole steadily advances, currently +800m downhole, with the measured production aimed at keeping the drillhole straight and on target to the planned final depth of 1,600m. To date, highly encouraging key indicators have been intersected in the drillhole, giving increased confidence of a large porphyry copper system at depth. Remobilised chalcophyrite- filled c-type veins have been intersected at ~400m downhole (see Photo 2). The assemblage and veining timing suggest the copper has remobilised from a deeper source.
A broad zone of intermittent anhydrite-pyrite veining has been encountered from ~485m to ~745m downhole (see Photo 3). These veins are hydrothermal assemblages commonly associated with porphyry copper deposits and are therefore important indicators to provide a vector towards mineralised zones.
Photo 3 Anhydrite-pyrite-quartz vein within altered porphyry in 25LLDD0070 from 640m*. *Cautionary Statement: Visual estimates of mineral abundance should never be considered a proxy or substitute for laboratory analyses where concentrations or grades are the factor of principal economic interest. Visual estimates also potentially provide no information regarding impurities or deleterious physical properties relevant to valuations.
Geophysical Model Accuracy
Drilling to date has seen excellent spacial correlation between downhole features encountered and 3D geophysical models. The epithermal zone is defined by a coincidental high IP chargeability and low IP resistivity feature. Remobilised sulphide veining intersected in altered porphyry is mapped by the low IP resistivity model extending to ~500m downhole. A zone of high magnetite content and low sulphide content is defined by the high magnetic model (see Figure 2). This geophysical model accuracy has given increased confidence to the location and size of the MT anomaly target below.
Figure 1. Plan view of Southern Porphyry, showing surface projections of geophysical models, mapped epithermal veining at surface, and planned drill targets.
Figure 3. Southern Porphyry target area within the Llahuin Project Joint Venture concessions* * Refer to FMR ASX announcement “Phase I Drilling Target Areas Refined at Southern Porphyry” dated 9 July 2025
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 3). 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 drilling at Target A, through the MT target toward the 1,600m planned depth
- Complete downhole geophysics (IP, EM conductivity, spectral gamma) on drillholes to refine and reconcile existing 3D geophysical models
- Report further assays and material observations as they become available
The Full PDF is available below.
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 These announcements are available to view on the Company’s website at www.fmrresources.com.au or on the ASX website at www.asx.com.au. The Company confirms that it is not aware of any new information or data that materially affects the information included in the original market announcement, and that all material assumptions and technical parameters underpinning the Exploration Results in the relevant market announcement continue to apply and have not materially changed.
Note: *Copper Equivalent (“CuEq”): The copper equivalent calculations represent the total metal value for each metal, multiplied by the conversion factor, summed and expressed in equivalent copper percentage. These results are exploration results only and no allowance is made for recovery losses that may occur should mining eventually result. It is the Company’s opinion that elements considered have a reasonable potential to be recovered as evidenced in similar multi-commodity natured mines. Copper equivalent conversion factors and long-term price assumptions used are stated below:
Notes on copper recovery from historical test work · “Recoveries of copper vary between 75% Cu and 91% Cu with the weighted average of the results being 84% Cu, which is a typically acceptable commercial level”; · “Recoveries of gold vary between 41% Au and 57% Au, which is in line with expectations given the relatively low gold grades within the deposit”; and · “Flotation concentrates produced during testing contained the resource weighted average copper grade of 28% Cu and 4.9g/t Au. They also contained low levels of deleterious materials in the concentrate. Given that these tests were designed to set parameters and were not optimised, the results indicated good flotation process characteristics”. Copper Equivalent Formula= Cu % + Au (g/t) x 1.6601 + Ag (g/t) x 0.0187 + Mo % x 3.57 Price Assumptions ($USD) – Cu ($3.50/lb), Au ($4,000/oz), Ag ($45/oz), Mo ($12.50/lb)
News Release
Date: 23 October 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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