Pinnacle Silver and Gold Corp. Updates Potrero Project Drilling, Extends Mineralization

VANCOUVER, BRITISH COLUMBIA — August 18, 2026 — Leads & Copy — Pinnacle Silver and Gold Corp. announced an update on its underground drilling program at the Potrero gold-silver property in Durango, Mexico, confirming a significant extension of the Pinos Cuates mineralized zone. The program, which began on May 5, 2026, involves drilling closely spaced holes from historic mine workings to define the size, shape, and average grade of the mineralized zones.

To date, 58 of the planned 108 holes have been drilled, with assays received for the first 37. Initial results highlight the Dos de Mayo vein's characteristics, typical of a low sulphidation epithermal breccia vein. Drill holes from the upper level of the historic Pinos Cuates mine have returned individual assays of up to 59.2 grams per tonne gold (g/t Au) and 424 grams per tonne silver (g/t Ag) over 1.07 metres, where visible gold was observed.

A horizontal hole drilled at a shallow angle to the vein extended the mineralization's strike length to the northwest by approximately 20 metres. This hole yielded a 13.18-metre core length assaying 9.69 g/t Au and 143 g/t Ag. The southeast strike extent was also increased, with assays up to 9.54 g/t Au and 134 g/t Ag over 1.5 metres. These findings suggest the potential strike length of the Pinos Cuates mineralized zone has been extended to at least 70 metres.

Of the results received, hole EPUG26035 in the upper level of Pinos Cuates provided the most significant findings. Drilled horizontally from the end of the underground workings, it confirmed mineralization for at least an additional 20 metres along strike to the northwest. The best intersection in this hole assayed 9.69 g/t Au and 143 g/t Ag over a core length of 13.18 metres, including a sample with visible gold assaying 59.2 g/t Au and 424 g/t Ag over 1.07 metres.

Holes EPUG26025 and EPUG26026, drilled along strike to the southeast, extended mineralization by up to 21 metres. Intercepts included 0.97 g/t Au and 16 g/t Ag over 4.50 metres, and 9.54 g/t Au and 134 g/t Ag over 1.5 metres, respectively. These results collectively extend the Pinos Cuates upper level mineralized zone's strike length to at least 70 metres.

“The first results from the Pinos Cuates mine are extremely encouraging,” said Robert Archer, President and CEO of Pinnacle. “While some of the mineralization here has already been mined, the drill holes are proving invaluable in improving our understanding of the El Potrero mineralizing system.”

The majority of the holes drilled to date have been on the two levels of the Pinos Cuates mine, with drilling ongoing. The drill is expected to move to the Dos de Mayo mine starting with hole EPUG26084.

The Dos de Mayo vein is described as a complex structure characterized by a polymictic breccia containing clasts of andesite and andesitic tuff, with veinlets of quartz, chalcedonic quartz, and quartz-calcite. Alteration includes silicification and oxidation, with halos of argillic alteration. Gold-silver mineralization is observed as ginguro in gray bands within colloform quartz and as free gold in dark gray to black colloform quartz bands.

Surface drilling is anticipated to begin in September-October to further delineate mineralization, test other areas, and delineate new veins like El Capulin and La Estrella. The combined results will be used to generate an internal resource estimate and develop a preliminary mine plan.

Pinnacle Silver and Gold Corp. focuses on developing precious metals projects in the Americas, including the Potrero project in Mexico and the Argosy Gold Mine and North Birch Project in northwestern Ontario.

Source: Pinnacle Silver and Gold Corp.