Pinnacle Discovers More High-Grade Polymetallic Mineralization at El Potrero with Silver Assays up to 1,159 grams per tonne Underscoring District Scale Potential (TheNewswire) VANCOUVER, BRITISH COLUMBIA – TheNewswire - April 20, 2026 (TSXV: PINN, OTC: PSGCF, Frankfurt: P9J) – Pinnacle Silver and Gold Corp. ("Pinnacle" or the “Company") is pleased to announce that continued ground follow up on shafts, adits and prospecting pits interpreted from the recent airborne LiDAR survey on the Potrero project in Durango, Mexico has resulted in further discoveries of polymetallic mineralization. Prospecting on the northern El Potrero claim block has resulted in the discovery of silver-rich veins, with assays up to 1,159 g/t Ag, while on the Maria Fernanda 2 (“MF2”) concession, continued field work has extended the previously announced silver-lead-zinc (Ag-Pb-Zn) mineralization along strike (see Pinnacle news release from March 17, 2026). HIGHLIGHTS Ground follow up of the recent airborne LiDAR survey on the Potrero Project has resulted in the discovery of new zones of polymetallic mineralization, enhancing the district scale potential of the project On the northern El Potrero claim group, a new series of adits on northeast-trending vein structures, dubbed the “Minas Nuevas”, returned assays up to 0.252 g/t Au, 1,159 g/t Ag, 4.72% Pb and 0.10% Zn over 0.35m On the MF2 block, the ”Paulina Breccia” zone has been traced for approximately 400 metres to the northeast with 0.217 g/t Au, 47 g/t Ag, 0.65% Pb and 0.71% Zn over 0.40 m and 0.232 g/t Au, 50 g/t Ag, 0.48% Pb and 0.77% Zn over 0.60 m. Also on the MF2 block and approximately 650 metres along strike to the southwest from the Paulina Breccia, an artisanal mine called “Las Guasimas” has yielded assays up to 3.21 g/t Au, 349 g/t Ag, 3.49% Pb and 5.30% Zn from dump grabs Collectively, the Paulina Breccia and Guasimas mine extend the apparent strike length of the vein system on MF2 to approximately 1,100 metres “These exciting discoveries of high-grade gold-silver-lead-zinc mineralization not only validate the effectiveness of the LiDAR survey, but are demonstrating the district scale potential of the mineralizing system at El Potrero,” stated Robert Archer, Pinnacle’s President & CEO. “From the processing plant at the northeast point of the project to the new Guasimas zone in the southwest is approximately 10 kilometres, and we now have both Au-Ag and Au-Ag-Pb-Zn mineralizing systems present. All of the recently discovered NE-SW trending polymetallic mineralization is in sharp contrast to the purely gold and silver NW-SE trending mineralization on the northern Dos de Mayo vein system and probably represents a completely different age of hydrothermal activity. As all four of the operating mines surrounding the project are polymetallic, and the Au-Ag-Pb-Zn veins at the Topia Mine are just 4 kilometres away from MF2, finding this style of mineralization across the Potrero property just underscores how prolific this area really is.” As announced on January 6, 2026, the LiDAR survey was flown over the entire 1,074 hectare property and confirmed known structural trends, outlined previously unknown structures, and identified a total of 6 shafts, 64 adits and 51 prospecting pits on the two claim blocks comprising the project (Figure 1). On the first pass of follow up work on the southern MF2 concession, several outcrops with silver-lead-zinc sulphides in silicified breccia veins returned individual assays up to 266 g/t silver, 4.39% lead and 2.89% zinc from channel samples up to 0.9 metres in length (see Pinnacle news release from March 17, 2026). Click Image To View Full Size Figure 1: El Potrero Project Showing Two Claim Blocks and Artisanal Workings Interpreted from LiDAR Survey Continued follow up field work has now revealed a larger system with multiple polymetallic veins on both claim blocks. On the northern El Potrero block, where the historic gold-silver mines and plant are located, a series of adits have been discovered on structures trending 030-040° and dipping 75-80° SE. Located in the south-central part of the block, approximately 3.5 kilometres south-southwest of the plant, these artisanal mine workings, named “Minas Nuevas”, host several structures with disseminated to semi-massive pyrite, galena, sphalerite, arsenopyrite and quartz veinlets. The high sulphide content, comparative lack of quartz and elevation of 1,350 metres above sea level (“masl”) compared to 2,200 masl at MF2, suggest that they may represent a lower level of the hydrothermal system. Preliminary sampling also indicates that the veins here are Ag-Pb dominant, with assays up to 1,159 g/t Ag and 4.72% over 0.35 metres. Table 1: Highlights of channel sampling on Minas Nuevas polymetallic veins at El Potrero Sample No. Width (m) Au g/t Ag g/t Pb % Zn % EPPR26094 0.30 0.038 240 4.74 0.17 EPPR26096 0.35 0.252 1,159 4.72 0.10 EPPR26098 0.25 0.064 334 0.33 0.20 EPPR26103 0.30 0.153 613 0.12 0.14 Click Ima