Altamira Gold Intersects High Grade Gold Mineralization in the First Drill Hole at the Guillermo Target and Extends Maria Bonita Mineralization at Depth, Cajueiro District, Brazil

The most recent news (March 18, 2026) reports significant drilling success at the Cajueiro District in Brazil. The first-ever drill hole at the Guillermo target (GLO-01) intersected 7m @ 4.2g/t gold, including a high-grade interval of 0.9m @ 18.1g/t gold. Simultaneously, hole MBA-034 at the Maria Bonita deposit confirmed that mineralization extends at least 100m below the current resource pit shell, returning 75m @ 0.3 g/t gold and 33.5m @ 0.4 g/t gold. The company is currently transitioning to scout drilling other regional targets (Mombaque) while continuing resource expansion at Cajueiro Central.

The impact is Material - Positive for three primary reasons: - New Discovery Validation: The Guillermo result (4.2g/t over 7m) is significantly higher grade than the average grade of the Maria Bonita resource (0.46g/t). This suggests the district may host higher-grade "sweet spots" within the larger porphyry systems. - System Scale: Confirming mineralization 100m below the Maria Bonita pit boundary supports the "vertically extensive" porphyry model, suggesting the current 720,000 oz resource (Indicated + Inferred) has substantial room to grow. - Execution Consistency: Management is successfully following through on the "district-scale" strategy outlined in late 2025, moving from discovery at Tavares Norte and Morro Verde to Guillermo.

Altamira Gold is a junior explorer focused on the Alta Floresta Belt in Mato Grosso, Brazil. Its flagship is the Cajueiro District, which hosts two main deposits: - Cajueiro Central: A higher-grade shear-hosted and porphyry system (700,000 oz Au total). - Maria Bonita: A large-tonnage, lower-grade gold porphyry discovery (720,000 oz Au total). The company controls ~90,000 hectares and is currently testing a 15km east-west corridor of potential porphyry centers.