Great Southern Copper PLC (LSE:GSCU) chief executive Sam Garrett talked with Proactive's Stephen Gunnion about the latest high-grade drilling results at the Cerro Negro project, with a focus on the Mostaza target area. Garrett said recent intercepts confirmed the presence of stacked lenses, potentially increasing the size and value of the copper-silver system. “The realisation in the recent drilling of the potential for stacked lenses is clearly going to give us the opportunity to expand the potential size of this deposit,” he explained. Metallurgical testing is underway to determine copper and silver recovery rates, which will enable the company to report results in copper or silver equivalents. Garrett said this will offer clearer comparisons with other assets in the sector. He also highlighted progress at the Viuda Negra prospect, where early drilling indicates a potentially large Maricunga-style gold porphyry system, significant as such systems have not previously been recognised in Chile’s coastal belt. While early gold grades were low, Garrett noted economic grades were intersected in mineralised porphyry zones. The company recently raised £2.5 million to fund expanded drilling at Especularita, with three rigs now active. Investors can expect news flow from ongoing drilling, further metallurgical updates, and planning for phase four drilling at Mostaza, as well as continued exploration at Viuda Negra and scout drilling across the broader Especularita region. For more interviews and updates from the mining and exploration sector, visit Proactive’s YouTube channel. Don’t forget to like the video, subscribe, and turn on notifications. #CopperExploration #SilverMining #GoldDiscovery #ViudaNegra #CerroNegro #MostazaDrilling #MetallurgyTesting #JuniorMining #ChileMining #MiningNews #NaturalResources #GreatSouthernCopper #ProactiveInvestors