Guanajuato Silver Files Technical Report for Bolanitos Mine

About this update from Guanajuato Silver Company Ltd.

VANCOUVER, BC / ACCESS Newswire / April 27, 2026 / Guanajuato Silver Company Ltd. (the "Company" or "GSilver") (TSXV:GSVR) (OTCQX:GSVRF), a growing silver-focused precious metals producer, is pleased to announce the filing of a National Instrument 43-101 Technical Report (the "Report") for Guanajuato Silver's 100% owned Bolanitos Mine located in Guanajuato, Mexico. The Report was prepared by Hard Rock Consulting, LLC, with an effective date of March 19, 2026, and supports the disclosure made by the Company in its news releases dated November 24, 2025 and January 15, 2026. The Report has been filed under the Company's SEDAR+ profile and can be viewed at sedarplus.ca. Mineral Reserve Estimate Table 1: Mineral Reserve Estimate, Effective Date December 31st, 2025 Classification Mine Area Tonnes (kt) Diluted Grades Contained Metal Ag (g/t) Au (g/t) AgEq (g/t) Ag (koz) Au (koz) AgEq (koz) Proven La Luz 39.4 50 1.53 188 63.7 1.9 238.4 Lucero 5.9 83 1.12 184 15.8 0.2 35.0 San Miguel 12.8 55 1.75 212 22.5 0.7 87.3 Proven Total   58.2 55 1.54 193 102.0 2.9 360.7 Probable La Luz 75.0 118 1.05 213 285.2 2.5 513.4 Lucero 192.4 64 1.04 157 395.4 6.4 973.7 San Miguel 63.2 62 1.40 188 126.2 2.9 382.7 Probable Total   330.6 76 1.11 176 806.9 11.8 1,869.8 Total Proven and Probable Reserves 388.7 73 1.17 178 908.8 14.7 2,230.5 Notes to accompany Mineral Reserves table: The effective date of the diluted Mineral Reserves estimate is December 31, 2025. The QP for the estimate, Mr. Jeffery Choquette, PE, of Hard Rock Consulting, LLC, is independent of Guanajuato Silver Company Ltd. Mineral Reserves are reported at the point of delivery to the process plant using the 2014 CIM Definition Standards. A 134 g/t AgEq cut-off is used for reporting the Mineral Reserves at La Luz and San Miguel and a 135 g/t AgEq cut-off is used for reporting Mineral Reserves at Lucero. Cut-off grade calculations are based on an average mining cost of $US51.91/t, a processing cost of $US26.28/t, a G&A cost of $US15.93/t, a non-deductible of $US0.44/t, and a 1% NSR Government Royalty. Metallurgical recoveries for cut-off grade calculations were 85.3% for silver and 90.1% for gold. Price assumptions are $US30.00 per troy ounce for silver and $US2,550.00 per troy ounce for gold for resource cut-off calculations. Silver equivalents are based on a 90:1 silver to gold price ratio using the follo...

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