Riverside Resources and Questcorp Announce Commencement of Phase 2 Drilling at Union Project, Sonora, Mexico

About this update from Riverside Resources Inc

Vancouver, British Columbia--(Newsfile Corp. - June 9, 2026) - Riverside Resources Inc.  (TSXV: RRI) (OTCQB: RVSDF) (FSE: 5YY) ("Riverside" or the "Company"), is pleased to announce that the Second Phase drill program has commenced at the Union Project in northwest Sonora, Mexico. This work is being carried out by the Company operating in partnership with Questcorp Mining Inc. (CSE: QQQ), which is earning into the project through an option agreement from Riverside (press release, May 6, 2025).Program HighlightsFully Funded Program Underway: A ~1,500-metre diamond drill program across 8 to 10 holes, each averaging 180 metres in depth, is fully funded and requires no near-term dilutive financing.Expanding Phase 1 Discoveries: Drilling is designed to expand zones of mineralization, including those intercepted during the Phase 1 program with results announced in January 2026, and to test new areas developed during the winter 2026 field program.District-Scale Target Testing: The program tests new targets and explores areas surrounding multiple historical mine workings across the 25 km² La Union project area.Two Mineralization Styles: Holes will test both the sediment-hosted gold mineralization identified in Phase 1 and carbonate-hosted replacement deposit (CRD) gold-silver-zinc mineralization, where gold is associated with mantos, chimneys, and structural zones.Structurally Targeted Drilling: Angled holes are oriented to intersect stratigraphic and structural targets at high angles, as is typical in CRD systems. Structural features interpreted as potential mineralizing conduits are a key focus of the program for high grade gold and zinc.Advanced Target De-Risking: Final drill positioning integrates property-wide structural mapping, 248 line-km of drone aeromagnetic coverage, and a recently completed property-wide induced polarization (IP) survey.Geological Analog: La Union's CRD and sediment-hosted gold systems share geological characteristics with significant deposits in northern Mexico and the southwestern United States.Continuous News Flow: Exploration is coordinated with partner Questcorp Mining Inc. (CSE: QQQ), supporting milestone-driven news flow through summer 2026.The exploration work over the past four months by Riverside has improved the understanding of the structural geology and stratigraphy of the project. The Union district lies along ...

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