Riverside Resources reported assays from seven holes totaling 530.1 metres in its Phase 2A summer 2026 core-drilling campaign at the Union Project, also known as La Union, in northwest Sonora, Mexico. Results at Union Norte confirmed near-surface gold and polymetallic mineralization, including a 14.60-metre intercept grading 0.45 g/t gold equivalent, while drilling at Union Mine intersected lead-zinc mineralization near historic Sproul manto workings. Riverside plans to resume drilling after the monsoon season, and Questcorp Mining is earning into the project under an option agreement dated May 6, 2025.