Core Silver releases visuals from Laverdiere drilling

Executive Summary

• Core Silver Corp. released visual results from drill hole LAV25-010 at its Laverdiere Copper Project, confirming a large, zoned porphyry copper-molybdenum-silver (Cu-Mo-Ag) system extending from surface to over 675 meters in depth.
• The hole was collared 1.8 km southwest of previous mineralization and intersects marginal zones of a Cu-Mo-Ag-rich orebody that remains open laterally and at depth.
• Drilling and structural mapping have traced porphyry-style mineralization for over 4.5 km across the Valley fault zone, bridging the gap between BC's Golden Triangle and the Yukon's Tintina gold belt.

Key Details

• Drill Hole LAV25-010 Highlights:
  • Intersected zones of Cu-Mo-Ag mineralization and associated porphyry-style alteration from surface to over 675 m drilled depth at the Valley zone.
  • Confirms the presence of a laterally and vertically zoned, multiphase porphyry system extending to depth.
  • Observed alteration and mineralization styles represent marginal zones of a copper-molybdenum-silver-rich orebody.
  • System remains open laterally and at depth.
• Regional Context & Scale:
  • Drilling and structural mapping have traced porphyry-style Cu-Mo-Ag-plus-or-minus-gold (Au) mineralization at Laverdiere for over 4.5 km, from the north adit (main skarn zone) to Lower Copper Creek.
  • Traced across multiple east-west fault splays spanning more than 2.5 km.
  • The Laverdiere project is described as a significant new porphyry discovery at the tip of the Stikine terrane.
• Previous Exploration Context (2025 Season):
  • Seven drill holes were completed across five locations along the Valley fault zone, totaling 3,857 meters.
  • The Valley fault zone previously returned surface assays of up to 366 g/t Ag, 0.71% Cu, and 0.54% Mo earlier in the 2025 season.
• Geological Interpretation:
  • Vertical zonation observed: silver-molybdenum-dominant mineralization near surface transitioning to molybdenum-plus-copper-rich chalcopyrite-bornite mineralization at depth.
  • Specular hematite-bearing breccias exhibit clear zonation, becoming progressively molybdenite plus or minus tourmaline plus or minus biotite rich with depth.
  • Mineralogical transition suggests ore-forming fluids evolved from oxidized to reduced conditions.
• Historical & Previous Drilling Data:
  • Historical adits (early 1900s) reportedly returned up to 27 m grading 1.20% Cu.
  • 1974 drilling reportedly returned 175 m of 0.27% Cu, including 6 m of 1.60% Cu and 7.8 m of 1.60% Cu.
  • 2022 drilling (LAV22-001): Up to 48.5 m of 0.90% Cu, 6 g/t Ag, and 0.11 g/t Au.
  • 2022 drilling (LAV22-002): 223 m of 0.11% Cu, 2 g/t Ag, and 0.006% Mo.
  • 2022 drilling (LAV22-006): 107.38 m of 0.11% Cu, 0.023% Mo, 0.9 g/t Ag, and 0.02 g/t Au.
  • 2024 Valley Zone sampling: Up to 3.24% Cu (with 82 g/t Ag, 0.56 g/t Au, and 0.053% Mo) and 0.32% Mo (with 1.03% Cu and 4 g/t Ag).
  • 2024 discovery: A 20 cm thick east-west-striking quartz vein grading 0.83% Cu, 47 g/t Ag, 0.44 g/t Au, and 0.007% Mo.
• Assay Status:
  • Assay results for all intervals described are pending.
  • Visual estimates of mineral abundance should not be considered representative of grade.

Notable Quotes

• "Drill hole LAV25-010 provides our clearest view yet into the scale of the porphyry system at Laverdiere. To see zones of impressive copper, molybdenum and silver mineralization from surface to over 675 metres in our first deep hole is extremely encouraging. The visual evidence at Valley points to a large, multiphase porphyry system that has the potential to evolve into a significant copper-silver-molybdenum system in the Atlin mining jurisdiction. We look forward to sharing additional visuals followed by assay results as they become available." — Nick Rodway, President and CEO