Riverside Resources and Questcorp Complete Expanded Aeromagnetic Drone Survey at La Union Project

About this update from Riverside Resources Inc

Vancouver, British Columbia--(Newsfile Corp. - May 21, 2026) - Riverside Resources Inc. (TSXV: RRI) (OTCQB: RVSDF) (FSE: 5YY0) ("Riverside" or the "Company"), with partner Questcorp, the Company has completed an expanded aeromagnetic drone survey at the La Union Project in Sonora, Mexico. The new data refines the drill targets and improves understanding of district-scale geologic structures. Together with property-wide structural mapping and the high-grade Phase 2 sampling results announced May 5, 2026, this information is being used to finalize drill targets ahead of the fully permitted summer 2026 drill program. Drill roads and pads are being prepared this week, and arrangements with the drilling contractor are progressing rapidly. The geophysics provides greater conviction in the scale of the potential feeder structures and the robust magnetic sources at depth, supporting both the Carbonate-hosted Replacement Deposit targets and the Sediment-hosted, Carlin-like stratigraphic targets discussed below. Highlights "The expanded aeromagnetic survey provides a much clearer view of the La Union Project's structural framework at depth. Combined with the high-grade sampling results released earlier this month, we now have the data in hand to refine our Phase 2 drill targets with greater conviction," said John-Mark Staude, President and CEO of Riverside Resources Inc. "The program is progressing well, and our teams are preparing for the launch of drilling in the near term. We are also expanding the drill targets in areas where high-grade gold and base metals were previously mined, and where geophysics can now image potential source targets at depth." Survey Overview The survey was flown with a magnetometer suspended beneath a drone along parallel flight lines, with tie lines flown perpendicular to level the dataset. The expanded grid extends magnetic coverage across the property in all directions relative to the 2025 baseline survey, providing district-wide imaging of structural features and magnetic bodies at depth. The 2025 dataset was a key input into planning the Phase 1 drillholes; the expanded 2026 dataset will allow these structures to be traced more confidently beneath post-mineral cover and build a more complete exploration model for Union. Photo: Drone operator with an airborne magnetometer at Union, Son...

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