Core Silver finds Cu vein system at Laverdiere

Executive Summary

• Core Silver Corp. has confirmed the discovery of a new copper-bearing porphyry vein system at Copper Creek, part of its Laverdiere copper project in the Atlin mining district of British Columbia.
• The discovery extends the known Cu-Mo-Ag mineralization footprint to approximately 4.5 kilometres, stretching from the Main copper skarn zone to Copper Creek, with the system remaining open for expansion.
• Surface sampling returned significant grades, including up to 1.35% copper, 9.1 g/t silver, and 355 ppm molybdenum, indicating a robust, multiphase hydrothermal system.

Key Details

• Discovery Location: Copper Creek, located approximately 2.6 kilometres south of the Valley fault zone on the eastern side of the Blue property.
• Surface Sample Assays:
  • Up to 1.35% Cu with 9.1 g/t Ag.
  • 0.63% Cu with 17 g/t Ag and 355 ppm Mo.
  • Multiple additional samples yielded anomalous Cu-Mo-Ag values.
• Geological Context:
  • Steeply dipping malachite-chalcopyrite-bearing veins and fractures are crosscut by epithermal-style quartz-carbonate veining.
  • Similar vein relationships observed 1.8 km west at Upper Copper Creek (assays pending) and along the Valley fault.
  • Mineralization is concentrated in fault splays and areas of structural complexity associated with the Llewellyn fault zone.
• Footprint Extension:
  • Cu-Mo-Ag mineralization confirmed across 4.5 km at Laverdiere.
  • Extends from the Main copper skarn zone (North adit) to Copper Creek.
  • System remains open for expansion in all directions.
• Historical Context & Previous Drilling:
  • 2022 drilling at Laverdiere returned up to 48.5 m of 0.90% Cu, 6 g/t Ag, and 0.11 g/t Au.
  • 2024 mapping at the Valley zone identified sheeted mineralized porphyry veins over a 1 km trend, with historical surface samples returning up to 3.24% Cu.
  • The Llewellyn fault zone cuts through the project for 14 km of strike length; only 1 km has been explored to date.
• QA/QC: Samples submitted to Bureau Veritas Labs in Whitehorse, Yukon, using method codes MA-250 (ICP-MS), FA-330 (Fire Assay), and MA-370 (ICP-OES for overlimits).

Notable Quotes

• "The discovery of a new copper porphyry vein system at Copper Creek marks an important step forward in demonstrating the true scale of the Laverdiere system. It is only our second drill season at Laverdiere, and we are seeing strong copper, molybdenum and silver mineralization over 4.5 kilometres -- a footprint that is rarely seen at this scale, during this stage of exploration in British Columbia." — Nick Rodway, President and CEO