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Great Southern Copper PLC said on Wednesday its phase three drilling results at the Cerro Negro prospect indicate high-grade copper and silver mineralisation at the site could be larger than initially anticipated. Assay results for holes DD0033 and DD036 confirmed the potential for a multiple lens system, said Great Southern Copper, with grades up to 3.29% for copper and 186 grams per tonne for silver at 191 metres. Additionally, the system appears to be broadening at depth, with the high-value minerals enveloped by lower-grade materials. The London-based mineral exploration company said that anomalous findings of lead and zinc, as well as low-grade copper and silver, suggests the system could be zoned, with a deposit width potentially over 80 metres thick. Drilling at another lens, DD034, yielded discoveries consistent with the previous two findings, significantly expanding the copper endowment potential of the discovery. All the phase three drillings have been completed last month, said the company, and planning for the next phase of resource and exploration drilling is in progress. Great Southern Copper Chief Executive Officer Sam Garrett said: ‘The confirmation of deeper high-grade mineralisation in DD033 and DD036, marks an important step forward in our understanding of the Mostaza system where we are now consistently intersecting multiple stacked high-grade copper-silver lenses developed within a broader mineralised envelope.’ ‘Cerro Negro is increasingly demonstrating the characteristics of a scalable copper-silver system with both discrete high-grade lenses within wider lower-grade envelopes, and we continue to refine the geological model to guide the next phase of drilling and prioritise high-impact targets along trend and at depth,’ he added. Great Southern Copper shares were down 9.8% to 2.76 pence each on Wednesday afternoon in London. Copyright 2026 Alliance News Ltd. All Rights Reserved.
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