Riverside Resources Reports High-Grade Gold, Silver and Base Metal Assays from Phase 2 Field Work at La Union Project

About this update from Riverside Resources Inc

Vancouver, British Columbia--(Newsfile Corp. - May 5, 2026) - Riverside Resources Inc. (TSXV: RRI) (OTCQB: RVSDF) (FSE: 5YY0) ("Riverside" or the "Company"), is pleased to report Phase 2 field work results from the La Union Project in Sonora, Mexico. Sampling of near-surface oxidized mine workings returned very high-grade assays that reinforce drill targets ahead of the upcoming program. Detailed channel sampling and reconnaissance mapping have returned high-grade gold, silver and zinc assays at the historical Union Mine and Union Norte targets, while regional reconnaissance has defined three new target areas: Jabalí, La Negra and Ali Hill for follow-up work.Highlights of Phase 2 Field WorkUnion Mine: 2.9 m channel sample averaging 20 g/t gold and 1.83% zinc, including 0.6 m at 91.7 g/t gold, and a 0.3 m interval grading 40% zinc.Union Norte: 1.0 m channel grading 4.38 g/t gold, 1,413 g/t silver, 7.7% lead and 6.38% zinc; and a separate 1.0 m channel grading 4.25 g/t gold, 1,827 g/t silver and 6.89% zinc.Creston: selective outcrop sampling returned 10.03 g/t gold with greater than 100 g/t silver and 8.06% lead.Three new target areas defined: Jabalí, La Negra and Ali Hill from regional reconnaissance carried out alongside detailed samplingDistrict-wide structural and geological interpretation completed, which will be used to guide drill targeting for Phase 2 drill program scheduled for early summer 2026."The Phase 2 field results highlight the strong potential of the La Union district and validate our systematic approach to exploration," said John-Mark Staude, President and CEO, Riverside Resources Inc. "The multiple ounce high-grade gold, silver and base-metal assays returned from the Union Mine and Union Norte underscore the importance of these targets as we move toward drill testing. Combined with the property-wide structural reinterpretation now in hand, our team is eager to begin the drill program with our partner Questcorp."Phase 2 Field Work OverviewThe Riverside field team has carried out detailed underground sampling and mapping at the Union Mine and Union Norte targets in addition to reconnaissance across the broader district to identify new exploration targets. A property-wide geological and structural reinterpretation has been completed and will be incorporated into Phase 2 drill targeting. Field work continues, and additional laborat...

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