AUS
NZ
UK
CA
USA
IND
_11_12_2025_12_33_28_218007.png)
Highlights
- Phase 1 drilling completed with 12 diamond core holes totaling over 1,600 metres.
- Six targets tested, including Union and Famosa mine areas.
- Over 700 samples shipped for assay, results pending.
Riverside Resources Inc. (TSXV:RRI) (OTCQB: RVSDF) (FSE: 5YY0) announced the completion of its first-phase drilling at the Union Project in Sonora, Mexico. A total of 12 diamond core holes were drilled, spanning more than 1,600 metres across six priority targets. The exploration work was conducted under the partnership with Questcorp Mining Inc. (“Questcorp”), which is funding the program under an option agreement signed earlier in 2025. Riverside is the project operator.
The Phase 1 campaign tested the Union Mine, Union Norte, Cobre, Luis, Famosa, and Famosa Mag targets. Three of these were past-producing areas, where the objective was to evaluate mineral continuity near historical workings. More than 700 half-core samples have been dispatched for assay, with results expected to guide the next exploration phase.
CEO Comments on Initial Findings
“This first exploration phase accomplished initial drill holes into 6 target areas. We tested multiple shallow gold and base metals targets, confirmed the key carbonate host units recognized by historic mining at Union and Famosa, and gathered the structural and alteration data to further progress efficient mineral exploration,” said Dr. John-Mark Staude, President and CEO of Riverside Resources.
“This historically mined CRD district, validated by new drilling and improved datasets, advances our geologic model and supports the potential for a large-scale discovery. With six targets advanced and more than 700 samples at the lab, once results are received, we will scope the next exploration program and focus on the most prospective trends indicated by assay results, stratigraphy, structure, and geophysics.”
Drilling Overview by Area
At Union Mine, three holes were designed to test manto horizons and chimney-style structures near historical workings. These holes were oriented to evaluate stratigraphy and alteration typical of carbonate replacement deposit (CRD) systems.
In the Famosa Mine Area, four holes targeted a west-dipping dolomite manto structure and nearby breccias. Historic surface dumps in this area had gold grades above 15 g/t, according to an NI 43-101 report filed on SEDAR+ in May 2025.
At Union Norte, two holes evaluated continuity along a mapped dolomitic carbonate horizon, while Cobre and Luis targets were drilled to assess sulfide occurrences and structural controls related to carbonate-hosted systems.
Sample Processing and Next Steps
Core samples were logged, saw-cut, and sent for gold fire assay and multi-element ICP-MS analysis at Bureau Veritas in Hermosillo and ACT Labs in Zacatecas. The final results will integrate with geophysical and geological data to refine the CRD model.
Following receipt of assays, Riverside plans to advance its exploration with a second-phase program expected in the first half of 2026. The upcoming campaign will expand drilling to test the most prospective zones based on Phase 1 findings.
About Riverside Resources Inc
Riverside Resources is a North America–focused exploration company with a portfolio of gold, silver, and copper assets and royalties. The company maintains no debt and has fewer than 75 million shares outstanding.
