⚒️ Southern Hemisphere Mining Limited reports results from the recently completed deep penetrating Magneto-Telluric (“MT”) geophysical survey, completed over the 100% owned Llahuin Copper-Gold-Moly Project in Chile.

HIGHLIGHTS
  • Excellent correlation between Magneto-Telluric survey, lithogeochemical depth target modelling and Induced Polarisation (IP) data over the large Curiosity copper-gold target at Llahuin.

Southern Hemisphere Mining Chairman Mark Stowell commenting on the geophysical survey results:

“The new Magneto-Telluric 3D inversion model outlines an area of low resistivity, extending over 1,400 metres below surface, which, reinforced by our geochemistry and shallow drilling results demonstrate Curiosity’s potential to host a significant copper gold porphyry deposit.

This study has increased the potential to grow the copper mineralisation footprint in the southern part of Llahuin substantially beyond the existing Central Cerro and Ferro open pit style deposits.

The configuration of the Curiosity MT target is remarkably similar to the original MT target at the large Valeriano porphyry copper-gold deposit in Chile operated by Atex Resources.”

The MT survey was successful in establishing a clear correlation between the previously announced litho-geochemical Fathom depth target model for mineralization comprising the Curiosity Copper Target, a sub- circular target 1km to 2km in diameter and this large MT resistivity anomaly extending significantly to depth.

Technical Discussion:

An area of particular interest is the deep zone of low resistivity defined by 3D inversion modelling of the MT dataset. This is also indicated by the PDIP modelling, close to the Curiosity (Southern Porphyry) target zone next to a zone of positive magnetism at depth and moderately subdued IP response. Viewed from the side, this deep zone of low resistivity, as imaged by the 3D inversion of the MT datasets, extends down from depths of around 500m within the magnetic corridor, and is closely correlated to a zone of moderate IP response, enveloped by more intense IP responses.

The target is further supported by a soil geochemistry anomaly at surface and two drillholes by the Company intersected copper-gold-moly mineralization including:

  • 23LHRC038, 164m at 0.16% CuEq1 (0.1% CuEq cut-off) from 2m and
  • 23LHRC039, 106m at 0.13% CuEq1 (0.1% CuEq cut-off) from 28m, including 2m at 1.45% CuEq1 from 168m.
View the Full PDF of the ASX Announcement
⚒️ The mapping and surface geochemistry and topography highlight the transition to gold-dominated epithermal surface showings Southeast of the known target area which fit with the schematic porphyry model (see Figure 8) of a large target at depth.

Figure 1 Llahuin Magneto-Telluric 3D Inversion Resistivity long section with north to right and MT Resistivity shells with green <100Ώm, pink <50Ώm and grey <35Ώm. Drill traces overlain.

Figure 2. Curiosity Magneto-Telluric 3D Inversion Resistivity in plan view with north to top, MT Resistivity shells with green <100Ώm, pink <50Ώm and grey <35Ώm and soil geochemistry overlaid.

Figure 3. Llahuin audio-frequency MT survey. 3D inversion model resisitvity isosurfaces (shells) at 100, 200 and 300 Ωm (red, orange and yellow respectively). Looking from above toward NW and side on from the east (south to le hand side). The objective of the survey was to characterize the distribution of the resistivity parameter to a depth of around 1.4km, to image resistivity contrasts that might be associated with buried alteration or sulphide mineralization and/or other features of geological interest.

2D and 3D inversion models for the distribution of resistivity indicate zones of moderate to low resistivity within a broadly resistive setting, except for a relatively shallow interval of moderate low resistivity perhaps related primarily to sedimentary cover and/or weathering. Although the relationship between resistivity and lithology, alteration and mineralization is non-unique, these deeper zones of moderate-low resistivity are compatible with the presence of conductive metallic sulphide mineralization, subject to integrated interpretation including alternative sources of geological information.

Similarities with the Valeriano Copper-Gold Porphyry Deposit Chile

The size and depth of the low resistivity zone at Curiosity is similar to the MT resistivity anomaly observed at the Valeriano deposit shown below. (Atex Resources 22 February 2022 TSXV Announcement).

Figure 4. Atex Resources 22 February 2022 TSXV announcement Valeriano MT Survey diagrams

Figure 5. 700mRL and on the right-500mRL depth slices Llahuin Curiosity MT Resistivity- Green >100 Ώm Yellow 50 Ώm to 100 Ώm red less than 50 Ώm and pink <35 Ώm

The Company intends to drill test the MT resistivity target with three to six deep drillholes. The first drillhole is to collar from an existing drill pad at Llahuin as shown in Figure 6 below to a depth of ~1,400m. This hole is designed to intersect the MT and fathom modelling target zones. Drill planning is in progress.

Figure 6. Drillhole plan to test the MT Resistivity anomaly at Curiosity

Figure 7. Planned drillhole in yellow generally intersecting the MT (green-brown-red) and Fathom (blue) targets, and near to the MVI (grey)

Southern Rock Geophysics completed the MT survey over the entire Llahuin Project including the Curiosity Copper Target property during December 2024 and January 2025 adding to prior broad spaced lines confined to the southern concessions. The MT survey, which uses natural time variations of the Earth’s magnetic and electric fields to measure the subsurface electrical resistivity, was designed to take measurements to depths of over 2,000 metres with the goal of confirming the trend of the target mineralized system and approximate boundaries of the Curiosity Copper Target as well as identify other targets.

Conclusion

This configuration of geophysical responses, with a “nucleus” of relatively low resistivity and moderate IP response, emplaced within more intense IP response (and higher resistivity) associated with reduced (near surface) magnetization is compatible with a fairly simplistic but useful geophysical parameter model of a porphyry copper system where the nucleus has interconnected (veinlets of) sulphide mineralization with a more copper rich mineralization assemblage, surrounded by predominantly disseminated pyrite mineralization with (shallow) magnetite destructive alteration and a possibly deeper increase in magnetization.

Further results will be reported in due course.

Figure 8. Schema c Porphyry Deposit Model (Section)

The Full PDF is available below.

View the Full PDF of the ASX Announcement
Prior Company announcements results of which included herein:
ASX Announcement dated 13 December 2024 Interim Drilling Results – Amended.
ASX Announcement dated 19 February 2024 Drilling Continues to Expand the Llahuin Copper-Gold Project
COMPETENT PERSON / QUALIFIED PERSON STATEMENT: The information in this report that relates to copper and gold exploration results for the Company’s Projects is based on information compiled by Mr Adam Anderson, who is a Member of The Australasian Institute of Mining and Metallurgy and The Australian Institute of Geoscientists. Mr Anderson has sufficient experience which is relevant to the style of mineralisation and type of deposit under consideration, and to the activity which he is undertaking 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”. Mr Anderson is a consultant for the Company and consents to the inclusion in the report of the matters based on his information in the form and context in which it appears.

News Release
Date: 15 April 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 Llahuin Porphyry Copper-Gold-Moly Project and the Los Pumas Manganese EV Battery Project, all of which were discovered by the Company.

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