Southern Silver Intersects 10.5 metres averaging 1,115g/t AgEq at Cerro Las Minitas Project in Durango, MéxicoVancouver, British Columbia--(Newsfile Corp. - December 1, 2025) - Southern Silver Exploration Corp. (TSXV: SSV) (the "Company" or "Southern Silver") reports today that rush assays from initial drilling on the recently acquired Puro Corazon claim have returned near surface Bonanza-grade silver mineralization from thick, semi-massive to massive-sulphide replacements in a hanging-wall lens outside of the main skarn target. The highlight assays were returned from hole 25CLM-203 and include:10.5 metre interval (estimated true thickness) averaging 560g/t Ag, 0.1g/t Au, 0.1% Cu, 11.2% Pb and 12.3% Zn (1,115g/t AgEq), including a 3.4 metre interval (estimated true thickness) averaging 1,067g/t Ag, 0.2g/t Au, 0.2% Cu, 20.0% Pb and 19.1% Zn (1,982g/t AgEq)(1) located within 200 metres of surface; and two narrower, high-grade intercepts occurring several metres down hole from the highlight intercept (above), which composite to a 2.6 metre interval (estimated true thickness) averaging 143g/t Ag, 4.8% Pb and 1.5%% Zn (280g/t AgEq) (1) located a further 6 metres down hole.(1) see AgEq calculation criteria in notes to Table 1. The replacement interval contains semi-massive to massive sulphides with up to 40% sphalerite (zinc), 30% galena (lead) and lesser pyrite with silver mineralization most strongly correlated to the galena content and represents a carbonate replacement hosted in limestone sitting outside of the main skarn zone and the historic Puro Corazon workings. Several additional mineralized zones were intersected deeper in drill hole 25CLM-203 including intervals of variably mineralized skarn. The intervals have been sampled and submitted for analyses; assays remain pending and will be released upon receipt. In addition, step-out holes from 25CLM-203 have intersected similar replacement-style massive to semi-massive sulphide intercepts both laterally and at depth. These intervals have been logged and sampled, with assays pending. Vice President of Exploration, Rob Macdonald stated "We're off to a strong start at Puro Corazon. These initial bonanza-grade silver intercepts confirm the near surface, high-grade nature of the mineralization and the overall prospectivity of the recently acquired Puro Corazon claim. With approximately 40% of the planned drilling program completed, I expect more positive exploration results through the first quarter of 2026." Assays from drill hole 25CLM-202 were also received and identified mineralized skarn located adjacent to the historic Santo Nino workings which are located to the north of the Puro Corazon claim boundary and on the larger CLM property. Highlights include:a 2.4 metre interval (estimated true thickness) averaging 62g/t Ag, 3.0% Pb and 5.2% Zn (273g/t AgEq).These are the first set of assays released from the Puro Corazon drilling program. As of this writing, ten of the proposed twenty-one holes are now complete for a total of 4,000 metres, with three holes currently in progress. Approximately 12,000 metres of drilling is planned to test the Puro Corazon claim both laterally and to depths of up to 450 metres below surface. Drilling continues on the property with less than 40% of the proposed 21-hole drill program having been completed to date, the Company anticipates significant news flow from this current drill program through Q1 2026.Figure 1: Plan view of the drilling on the recently acquired Puro Corazon Claim.To view an enhanced version of this graphic, please visit:https://images.newsfilecorp.com/files/5344/276315_a2d850b8a49cca2f_002full.jpgThe Company also reports that it has initiated an underground sampling program in the historic Puro Corazon workings. Up to 2000 individual channel samples are planned throughout the 13 different mine levels of the Puro Corazon mine. The sampling will be utilized to inform updated resource models from the mine area as well as establish potential site for future bulk-sampling of the mineralization. Sampling has started and results will be reported as assays are received.Next StepsThe Company is planning to incorporate the results of the Puro Corazon drilling program into the much larger Cerro Las Minitas project to significantly enhance the project economics. Final assays are expected to be received by the end of the first quarter of 2026, after which the Company intends to:update the Mineral Resource Estimate of the Cerro Las Minitas project; followed by an update of the Preliminary economic Assessment ("PEA") of the project in accordance with the provisions of National Instrument 43-101. The Company reports that work on the Cerro Las Minitas project continues advancing numerous upside opportunities identified subsequent to the July 2024 PEA, while also derisking and advancing the project with the commencement of baseline data collection, hydrology, geotechnical, archaeological and land surveys and studies. As curren