Great Southern Copper PLC (LSE:GSCU) told investors it has completed its Phase III diamond and RC drilling programme at the Cerro Negro prospect in Chile.
The company reported further extension of the high-grade copper-silver system at the Mostaza target.
The programme included 17 diamond drill holes and six RC holes totalling nearly 4,000 metres. Previously released results from Lens 2 included intercepts such as 1.1 metres at 8.92% copper and 715.3 grams per tonne silver. Assay results for the remaining holes are pending.
"Phase III has been our most ambitious and productive drilling programme so far at Cerro Negro, and it has delivered exactly what we hoped for: continued high-grade copper-silver hits, confirmation of stacked sulphide lenses, and strong indications that the broader Mostaza Fault Zone has the potential to host a larger mineralised system than originally recognised, at a time when copper, gold and silver markets are demonstrating sustained pricing strength," said chief executive Sam Garrett.
The company is now planning the next phase of drilling across Cerro Negro, Viuda and Colorada. It aims to test new high-priority targets, including porphyry gold-copper systems.
Garrett added: "Our aim is that 2026 will be another significant year of growth for GSC as we advance follow-up drilling at Cerro Negro and Viuda, test new high-priority targets at Colorada, and continue to define the expanding mineral system at Mostaza. We look forward to updating the market as results are received."