San Lorenzo Reports Assay Results from Epithermal Focused Drilling on the "San Juan Extension" of the Arco de Oro Epithermal System and Provides Exploration and Drilling Update

San Lorenzo Gold Corp. (SLG) released assay results from four new drill holes (SAL‑11-25 to SAL‑14‑25) at the Salvadora property, testing the “San Juan Extension” of the Arco de Oro epithermal system. The drilling intercepted broad, near‑surface gold mineralization over an additional 0.5 km of strike, 3.4–3.9 km northwest of the nearest prior hole on the trend.

Highlights include: * 21.5 m at 1.32 g/t Au (with 5.82 g/t sub‑intervals) * 23 m at 1.41 g/t Au (9.52 g/t inside) * 13.3 m at 1.56 g/t Au (9.85 g/t inside)

The system remains open to the northwest, and the company now sees potential for >7.5 km of cumulative strike. Phase 7 drilling is imminent, with pad construction complete and three rigs planned, focusing on Cerro Blanco and Arco de Oro porphyry targets. These epithermal results confirm a secondary high‑grade vein system that adds optionality.

San Lorenzo Gold Corp. (SLG) released results confirming that its epithermal vein system extends beyond the core zone and contains high-grade shoots. These findings follow the June 4 final assays from SAL 10-25, which confirmed deep porphyry-style mineralization at the Arco de Oro project. The company’s Phase 7 program will target bulk tonnage targets rather than the epithermal veins, consistent with management’s stated strategy.

The market previously reacted to the May 8, 2026 discovery of a large porphyry system at Arco de Oro, with shares rising from approximately $3 to over $5. This latest release demonstrates the broader system’s fertility but does not alter the primary investment thesis focused on bulk-tonnage porphyry potential. There is no new financing, resource estimate, or strategic investment associated with this announcement.

San Lorenzo Gold Corp. is a Chile-focused exploration company with a 100%-owned flagship Salvadora property covering 11,962 hectares in Region III, approximately 15 km from the El Salvador porphyry mine. The project hosts multiple porphyry copper-gold and epithermal gold-silver targets, including Caballo Muerto, Tres Amigos, and Caballo South.

Drilling has defined two key zones: Cerro Blanco, a porphyry system with broad intercepts such as 153.5 m at 1.04 g/t Au, and Arco de Oro, a multi-kilometer epithermal vein system that transitions to porphyry-style mineralization at depth, as shown by holes SAL-09-25 and SAL-10-25.

The company has no mineral resource estimate. All technical information is overseen by VP Exploration Terence Walker, P.Geo., a qualified person under NI 43-101.