Harfang Announces Drill Results from Mista in Quebec

Executive Summary

• Harfang Exploration Inc. reported 2026 diamond drilling results at the Mista target on its wholly-owned Serpent Project in Eeyou Istchee James Bay, Québec.
• The program successfully confirmed a broad metal zonation pattern (Cu-Au-Ag and Zn-Cu-Pb-Ag-Au) consistent with an intrusion-related hydrothermal system along a 650-metre trend.
• Significant intercepts include 4.30m @ 0.47% Cu, 0.22 g/t Au, 6.76 g/t Ag; 6.10m @ 0.17% Cu, 0.25 g/t Au, 2.10 g/t Ag (incl. 1.15m @ 0.68% Cu, 1.26 g/t Au, 8.84 g/t Ag); and 4.05m @ 0.39% Cu, 0.19 g/t Au, 12.1 g/t Ag, 0.49% Zn, 0.21% Pb.

Key Details

• Drill Program Scope: 1,188 metres completed across six diamond drill holes from mid-March to early April 2026.
• Target Background: Mista is a 650-metre-long trend defined by surface mineralization, a moderate magnetic survey, and a strong chargeability anomaly. Previously identified via 2019 prospecting, 2020 DC-IP, and 2024 surface exploration.
• Significant Intercepts:
• SER-26-006: 4.30 m @ 0.47% Cu, 0.22 g/t Au, 6.76 g/t Ag
• SER-26-002: 6.10 m @ 0.17% Cu, 0.25 g/t Au, 2.10 g/t Ag (including 1.15 m @ 0.68% Cu, 1.26 g/t Au, 8.84 g/t Ag)
• SER-26-003: 4.05 m @ 0.39% Cu, 0.19 g/t Au, 12.1 g/t Ag, 0.49% Zn, 0.21% Pb
• SER-26-001: 0.75 m @ 0.51% Mo (northwestern trend)
• Geological Model: Results outline a clear metal zonation pattern centered on a felsic intrusive system. Molybdenum is associated with altered granodiorite, Cu-Au-Ag occurs in proximal metasomatized clastic sedimentary rocks near contacts, and distal polymetallic mineralization (Zn, Cu, Pb, Ag, Au) occurs farther from the intrusive center.
• Surface vs. Downhole Comparison: Drill intercepts returned lower grades and narrower mineralized zones (typically 1 to 6 metres in core length) compared to surface trench results (exceeding 10 metres).
• QA/QC Protocols: Core samples were logged, photographed, and split under geologist supervision. Samples were sent to AGAT Laboratories (Val-d'Or) for analysis. Gold analyzed via fire assay/atomic absorption; base metals via four-acid digestion/ICP-OES/MS. Strict QA/QC implemented with certified reference materials, blanks, and field duplicates.
• Qualified Person: Ludovic Bigot, P.Geo., VP Exploration, prepared and approved the technical information per National Instrument 43-101.

Notable Quotes

• Rick Breger, President and CEO: "Although this drill program did not replicate the widths and grades observed at surface, it successfully confirmed the presence of a mineralized hydrothermal system at Mista. The identification of a clear metal zonation pattern, including copper-gold-silver and polymetallic mineralization along a 650-metre trend, provides strong support for our geological model and demonstrates the scale of the system. We believe Mista remains an attractive exploration target and the results provide valuable information for future exploration."