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Ground Magnetics Survey Commences at Viuda
Great Southern Copper PLC has commenced a 250 line-kilometre ground magnetic survey at its Viuda porphyry Au-Cu prospect in Chile, targeting Maricunga-style deposits. Previous scout drilling intersected significant gold and copper mineralisation, including 6.7m at 0.39 g/t Au and 0.12% Cu from 43.1m in DD004, and 14.2m at 0.21 g/t Au and 0.11% Cu from 11m in DD002. The company has an option to earn 100% of the Viuda prospect, which is located at low elevation with good infrastructure access. Phase II drilling is anticipated in early 2026. Disclaimer*
About this update from Great Southern Copper Plc
[{"type":"text","content":"\n\n \nTHIS ANNOUNCEMENT CONTAINS INSIDE INFORMATION AS STIPULATED UNDER THE UK VERSION OF THE MARKET ABUSE REGULATION NO 596/2014 WHICH IS PART OF ENGLISH LAW BY VIRTUE OF THE EUROPEAN (WITHDRAWAL) ACT 2018, AS AMENDED. ON PUBLICATION OF THIS ANNOUNCEMENT VIA A REGULATORY INFORMATION SERVICE, THIS INFORMATION IS CONSIDERED TO BE IN THE PUBLIC DOMAIN.\n \n \n18 December 2025\n \nGreat Southern Copper plc\n(\"GSC\" or the \"Company\")\n \nGround Magnetics Survey Commences at Viuda Gold Prospect\n \nTargeting Maricunga-style porphyry Au-Cu deposits\n \nGreat Southern Copper plc (LSE: GSCU), the company focused on copper-gold-silver exploration in Chile, is pleased to announce that it has commenced a ground magnetic survey at its Viuda porphyry Au-Cu prospect (\"Viuda\") at the Company's Especularita project.\n \nHighlights:\n· Ground magnetics commences with a 250 line-kilometre survey at Viuda\n· Exploration targeting large-scale Maricunga porphyry Au-Cu type deposits\n· Previous scout drilling intersected broad zones of gold mineralisation, including1;\no DD004: 6.7m @ 0.39 g/t Au & 0.12% Cu from 43.1m, within broader interval of:\n§ 121.5m @ 0.11 g/t Au & 0.05% Cu from 6.5m, and\no DD002: 14.2m @ 0.21 g/t Au & 0.11% Cu from 11m, within broader interval of:\n§ 73m @ 0.14 g/t Au & 0.1% Cu from 11m\n· High gold grades hosted in stockwork veining within magnetic porphyry intrusive\n· Phase II drilling at Viuda is anticipated in early 2026\n· GSC has option to earn 100% of the Viuda prospect\n· Viuda located at low elevation with excellent access to infrastructure and mining services\n \nPorphyry Au deposits in Chile:\nScout drilling by GSC at Viuda earlier this year confirmed that gold and copper mineralisation is associated with stockwork and sheeted dark-banded and A-type quartz veinlets within widespread intermediate-argillic and magnetite-albite-chlorite altered diorite porphyry intrusives. The mineralisation and alteration are typical of Maricunga-style gold porphyry systems, such as Kinross Gold's Lobo-Marte deposit (6.7Moz Au at 1.3 g/t2), M...