Pinnacle conducts channel sampling at Dos de Mayo

Executive Summary

• Systematic underground channel sampling at the historic Dos de Mayo mine returned high‑grade gold–silver intercepts, including up to 27.6 g/t Au and 366 g/t Ag over 0.6 m.
• Weighted average of mineralized composites in the raise is 6.43 g/t Au and 110 g/t Ag, confirming a precious‑metal‑dominant system with low base‑metal values.
• Results support ongoing 3‑D modeling and planning for detailed underground delineation drilling across all three historic mines on the Potrero property.

Key Details

• Sampling Overview: 53 channel samples in 13 composite channels taken from a 1.5 m diameter raise connecting two levels 25.5 m apart.
• Top Intercepts (Raise):
• 11.2 g/t Au & 179 g/t Ag over 3.5 m
• 15.55 g/t Au & 222 g/t Ag over 1.1 m
• 11.93 g/t Au & 190 g/t Ag over 1.4 m
• Highest Individual Assays: 27.6 g/t Au and 366 g/t Ag over a 0.6 m interval.
• Weighted Average (Raise): 6.43 g/t Au; 110 g/t Ag.
• Main Level Samples (146 channels): Mostly < 1 g/t Au, indicating they lie outside the mineralized horizon.
• Sub‑level Samples (42 channels in 9 composites): Notable intercepts of 10.99 g/t Au & 61 g/t Ag over 0.9 m and 4.22 g/t Au & 40 g/t Ag over 0.6 m.
• Assay Range (All Raise Samples): 0.061–27.6 g/t Au; 8–366 g/t Ag.
• Base‑Metal Results: Consistently low Cu, Pb, Zn confirming a precious‑metal‑dominant system.
• Project Context: Dos de Mayo is the southeastern of three historic mines along a 500‑m strike; surface vein system traced for 1,600 m with additional parallel veins under evaluation.
• Modeling & Survey Work: Mine workings accurately surveyed; individual 3‑D models being built in Leapfrog.
• QA/QC Procedures: NI 43‑101 compliant; samples processed by SGS (ISO/IEC 17025:2017 accredited) using fire assay for Au and ICP‑OES for Ag and other elements.
• Future Plans: Planning underground delineation drilling at all three main mines; details to be released in due course.

Notable Quotes

“What we are seeing is consistent with these low‑sulphidation epithermal systems… pockets of high‑grade mineralization (called clavos in Mexico) occur within a defined horizon…” – Robert Archer, President & CEO, Pinnacle Silver and Gold Corp.

Materiality Assessment: Material – Positive (high‑grade assay results indicating significant exploration upside).