Riverside Resources and Questcorp Launch Phase 2 Exploration Program at La Union Project, Sonora, Mexico

About this update from Riverside Resources Inc

Riverside Resources and Questcorp Launch Phase 2 Exploration Program at La Union Project, Sonora, MexicoVancouver, British Columbia--(Newsfile Corp. - April 1, 2026) -  Riverside Resources Inc.  (TSXV: RRI) (OTCQB: RVSDF) (FSE: 5YY0) ("Riverside" or the "Company"), is pleased to announce the commencement of the Phase 2 exploration program at La Union Project in Sonora, Mexico. The program builds on the success of the 12-hole Phase 1 drill program announced January 22, 2026, which delivered a new sediment-hosted gold discovery at Luis Hill returning 42m grading 0.3 g/t gold. Funded by Questcorp, Phase 2 has mobilized teams to the field across four main target areas, where work will include geological mapping, geochemistry, geophysics, and a property-wide structural analysis."We are pleased to have a fully funded exploration program and have immediately activated our team in the field," said John-Mark Staude, President and CEO, Riverside Resources Inc. "I have just returned from Sonora, where the Phase 2 program is progressing well, with the Riverside team conducting safe, high-quality work encompassing sampling, mapping, geological targeting, and geochemistry with the aeromagnetic geophysics expansion launching shortly. Building directly on our Phase 1 results, including the high-grade channel sampling at Union Mine and the new sediment-hosted gold discovery at Luis Hill, we have multiple well-defined targets to advance. Riverside is pleased to continue working with partner Questcorp, and as a shareholder in Questcorp, our interests in the success of the Union Project are well aligned."Planned exploration for this program includes:Follow-up work on sediment-hosted gold ("SHGD") targets identified during Phase 1 drilling, where gold was intersected in sedimentary rocks below the primary Carbonate Replacement Deposit ("CRD") host units, consistent with districts known to host both CRD and SHGD deposit styles.Underground follow-up sampling at the Union Mine, where the previously announced chip-channel interval on January 22, 2026, remains open on both ends and warrants further investigation.CRD targeting at the Famosa North area, where lead and zinc anomalies have never been drill-tested; field studies in this area will support upcoming drill targeting. The Famosa mineral concessions were recently consolidated into Riverside's land package, as ...

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