GR Silver reports 45.1 m at 1,623 g/t Ag at San Marcial hole SMS26-04

News provided by GR Silver Mining Ltd. May 19, 2026, 17:47 ET Share this article Share to X Share this article Share to X VANCOUVER, BC , May 19, 2026 /CNW/ - GR Silver Mining Ltd. ( " GR Silver Mining" or the "Company" ) (TSXV: GRSL ) (OTCQX: GRSLF) (FRANKFURT: GPE) is pleased to announce outstanding drill results from hole SMS26-04 in the SE Area of San Marcial. These exceptionally high silver grades represent the "best ever" drill results from the San Marcial deposit, confirming the robust geological model, and the continuity of high-grade silver mineralization controlled by key structural features. Highlights of 2026 Step-Out Dri l l i ng at San Marcial Continue Reading Figure 1.

Location of San Marcial Step-Out Drill Holes SMS26-04, SMS22-16, SMS22-22 & SMS25-11 (CNW Group/GR Silver Mining Ltd.) Figure 2. Cross Section A-B (see Figure 1) – SMS26-04 in Relation to SMS22-16, SMS22-22 and SMS25-11 (CNW Group/GR Silver Mining Ltd.) Figure 3. Drill Core Photo Illustration - SMS26-04 High Grades in Main Breccia Zone (Main breccia zone defined by red lines) (CNW Group/GR Silver Mining Ltd.) Figure 4.

Drill Core Photo Illustrations - SMS26-04 High-Grade Samples (CNW Group/GR Silver Mining Ltd.) Figure 4. Drill Core Photo Illustrations - SMS26-04 High-Grade Samples (CNW Group/GR Silver Mining Ltd.) Figure 5. Structural Analysis of D2 and D3 Deformation Stages for San Marcial Area (CNW Group/GR Silver Mining Ltd.) Figure 5.

Structural Analysis of D2 and D3 Deformation Stages for San Marcial Area (CNW Group/GR Silver Mining Ltd.) Figure 6. Longitudinal Section – Location SMS26-04 – Potential Resource Expansion (CNW Group/GR Silver Mining Ltd.) Table 2: 2026 San Marcial SE Area Step-Out Drill Program – Drill Hole Details; Note: all holes drilled from surface; * - not final depth; WGS84 Datum. (CNW Group/GR Silver Mining Ltd.) SMS26-04 int