VANCOUVER, British Columbia, Sept. 09, 2026 (GLOBE NEWSWIRE) — Riverside Resources Inc. (“Riverside” or the “Company”) (TSX-V: RRI) (OTCQB: RVSDF) (FSE: 5YY0), is pleased to report the assay results from the Phase 2A summer 2026 core drilling campaign following up on the high-grade gold-zinc mineralization and successful Phase 1 drilling of late last year. The Phase 2A drill program at the Union Project in northwest Sonora, Mexico has again intersected gold and base metals, continuing to expand upon the carbonate hosted replacement deposits (CRD) associated with past mining while also delivering success at new targets and advancing district-wide targeting. The exploration work is being carried out by Riverside in partnership with Questcorp Mining Inc. (CSE: QQQ), who is earning into the project through an option agreement (see news release, May 6, 2025). The success from this part of the program, which included core drilling, can now be expanded upon when Phase 2B drilling resumes following the seasonal break for the monsoon rainy season, which typically wraps up toward the end of September. These results confirm two main target areas. The program will continue drilling these areas, along with sediment-hosted gold targets at Luis Hill and vein targets at the Jabali area. Union and Union Norte drill results are summarized below, with further drilling planned for the Phase 2B drill campaign.