Sendero Resources Provides Strategic and Exploration Update at the Penas Negras Project, Argentina

Executive Summary

• Sendero Resources announces completion of Phase I (3,126 m core drilling, extensive geophysical work) and outlines a Phase II drill program (~3,600 m) slated for Q1 2026 to test a newly modeled porphyry‑epithermal target in the Vicuña Belt.
• Phase I generated multiple intercepts of gold‑copper mineralization (e.g., 256 m @ 0.53 g/t AuEq, 364 m @ 0.51 g/t AuEq).
• The company has integrated regional datasets into a predictive discovery model that identifies a 3 km × 2 km structurally‑defined target area and supports a pipeline of future exploration targets on its 211 km² land package.

Key Details

• Phase I Summary:
• 3,126 m core drilling in eight holes.
• 715 km airborne magnetics/radiometrics; 10 km² IP lines; 211 km ground magnetics surveys.

• Results demonstrated both porphyry and epithermal mineralization signatures.

• Highlighted Intercepts (Phase I):

• Hole PNDH‑001 (La Peña) – 226 m @ 0.22 g/t AuEq from surface*.
• Hole PNDH‑002 (Tamberías) – 168 m @ 0.22 g/t AuEq from surface*.
• Hole PNDH‑003 (La Ollita) – 256 m @ 0.53 g/t AuEq from 84 m*.
• Hole PNDH‑004 (La Ollita) – 266 m @ 0.52 g/t AuEq from 96 m**.
• Hole PNDH‑05 (La Ollita) – 300 m @ 0.36 g/t AuEq from 122 m**.

• Hole PNDH‑06 (La Ollita) – 364.2 m @ 0.51 g/t AuEq from 33.8 m**.

• Data Integration & Modeling:

• Consolidated historic and recent geophysical, geochemical, spectral, drilling, trenching, and structural data into an integrated database.

• Developed a mineral‑systems‑based geological model highlighting a gold‑copper porphyry system with high‑sulfidation epithermal affinities within the Mogotes structural corridor.

• Phase II (Q1 2026) Plan:

• ~3,600 m of drilling targeting the newly defined 3 km × 2 km tract that exhibits favorable structural, alteration, and geophysical signatures.

• Objective: advance Peñas Negras toward a discovery capable of redefining the Mogotes corridor.

• Strategic Context:

• Project sits in central Vicuña Belt, adjacent to world‑class copper‑gold discoveries (Filo del Sol, José María, Lunahuasi).

• Land package totals 211 km² with additional option to earn 100 % interest on eight adjoining concessions covering 91.7 km².

• Management Quote:

  “2025 has been a transformative year for Sendero… Our focus now shifts to drilling – the stage where true value is created.” – Alex Gostevskikh, CEO

Notable Quotes

• “Our focus now shifts to drilling – the stage where true value is created. We believe Peñas Negras gives our shareholders rare exposure to the next discovery potential in the Vicuña Belt.” – Alex Gostevskikh, Chief Executive Officer

Qualified Person: Steven McMullan, P.Geo., NI 43‑101 qualified.