Highlights

  • Southern Hemisphere Mining is extending a historical diamond hole at its Llahuin project in Chile to test for a porphyry feeder zone beneath the Cerro deposit.
  • The deep target is informed by copper isotope analysis, with initial assays from the extended hole expected later this month.
  • A new copper-gold prospect featuring a historical gold intercept that was never assayed for copper is next in line for drilling.

Copper continues to attract strong interest in Australia as electrification, renewable energy and grid upgrades underpin long-term Demand for the metal. ASX-listed explorers with projects in established copper provinces such as Chile are part of that story. Southern Hemisphere Mining Limited (ASX:SUH), a critical minerals explorer with copper, gold, molybdenum and manganese projects in Chile, has provided an update on drilling at its wholly owned Llahuin Copper-Gold-Molybdenum Project. The company is pushing a historical hole deeper in search of the source of copper mineralisation, an exploration step that keeps it in focus among Metal and Mining Stocks with exposure to porphyry copper systems.

Extending a Historical Hole to Test Depth

Southern Hemisphere has re-entered a historical diamond hole at the Cerro deposit within Llahuin and is extending it well beyond its original depth. At the time of the update, the extension had advanced substantially and drilling was continuing around the clock toward a planned target depth.

The aim is to locate a porphyry feeder zone beneath the Cerro deposit. In porphyry copper systems, the feeder or core zone is where mineralising fluids are interpreted to have originated, and it can host higher-grade mineralisation than the surrounding halo. Identifying such a zone could help the company better understand the overall geometry and potential of the system.

Copper Isotope Science Guides the Target

The deep target draws on the company's own geological work and on copper isotope analysis provided by consultant VectOres, which Southern Hemisphere reported to the ASX in late September. Copper isotope vectoring is an emerging technique that uses subtle variations in copper isotopes to help indicate the direction of a mineralising source.

While the technique can sharpen targeting, it does not confirm mineralisation on its own. The deep hole is therefore a test of the interpretation, and laboratory assays will be needed to determine whether the extension has intersected a feeder zone or significant copper grades.

Part of a Broader Resource Extension Programme

The deep hole forms part of an initial diamond drilling programme designed to extend the existing Mineral Resource at the Cerro, Ferro and Ferro South zones. Most holes in the programme are planned to moderate depths, with the deepest tests reaching considerably further, and the company has said the programme may be extended depending on results.

Llahuin already hosts a JORC Mineral Resource Estimate reported last year, which provides the base the current drilling is seeking to extend. Earlier in October, the company reported chalcocite logged in ongoing diamond drilling at Ferro South, adding to activity across the project.

The company's September quarter activities report, released late last month, summarised drilling progress and earlier copper intersections across Llahuin. Together, these updates show a programme focused both on adding to the known resource and on testing whether a larger porphyry system sits at depth.

New Copper-Gold Prospect Moves Up the Queue

Southern Hemisphere has added a new copper-gold prospect to the drilling programme, and it is planned as the next hole after the deep extension. The prospect features a historical reverse circulation hole that returned a gold intercept at shallow depth but was never assayed for copper or other elements.

The company has sent the historical sample pulps for full multi-element analysis. It also reported that recent rains exposed outcrop with visible chalcocite, which was logged visually. Southern Hemisphere has cautioned that visual estimates are not a substitute for laboratory analysis, so the copper potential of the prospect remains untested.

Timing, Risks and Next Steps

Chairman Mark Stowell said the company is encouraged with progress on the deep hole extension and that initial assays are due late this month, based on standard laboratory turnaround. He described the new prospect as possibly higher grade, a view that remains to be tested by drilling and assays.

Exploration drilling carries inherent uncertainty. The feeder zone is an interpreted target, the planned depth is an estimate, and historical data on the new prospect has limitations. Laboratory delays, drilling conditions and results that fall short of expectations are all possible outcomes.

Testing the Depth Potential at Llahuin

Southern Hemisphere Mining is testing whether the Cerro deposit at Llahuin is fed by a deeper porphyry source, using copper isotope analysis to guide its deepest hole at the project. Initial assays are expected later this month, and a new copper-gold prospect is next in line. For Australian readers, the update reflects the activity of ASX-listed explorers in Chile's copper belt, a theme closely tied to global electrification and the broader Australian resources market.