Highlights of the program
- 12 core holes completed for a total of >1,600 m.
- Six targets drilled: Union Mine, Union Norte, Cobre, Luis, Famosa and Famosa Mag.
- Three mining areas that were productive in the past were tested alongside historic mines to evaluate continuity.
- >700 half-core samples shipped; testing pending.
- Holes oriented at an angle and near vertical to intersect stratigraphy and structures typical of Carbonate Replacement Deposit (“CRD”) type systems, with focus below oxidized horizons generally <150 m deep.
“This initial phase of exploration established the first drill holes in six target areas. We tested multiple shallow gold and base metal targets, confirmed the major carbonate host units recognized by historic Union and Famosa mining, and collected the structural and alteration data to further advance 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 data sets, advances our geological model and supports the potential for a large-scale discovery. With six advanced targets and more than 700 samples in the laboratory, once results are received, we will explore the next exploration program and focus on the most prospective trends indicated by test results, stratigraphy, structure and geophysics.”
Questcorp’s President & CEO said, “We are pleased to have completed this first phase of drilling at La Union under the leadership of Riverside’s experienced engineering team and their subcontracted drillers. The company eagerly awaits the return of testing from the laboratory as we look at plans for further development.”
Drilling update per area
Union mine: Three holes in the Union Mine targeted manto horizons and stack/feeder structures adjacent to historic underground workings. This exploration drilling was intended to evaluate the stratigraphy, alteration and continuity of mineralization typical of CRD systems.
The famous mining area: Four core holes tested a west-dipping dolomite manto target and adjacent structures. Intrusive dikes and breccias were noted during logging; no geochronology has been completed. Historical small-scale mining left surface dumps reported with gold values of >0.5 oz/t Au (>15 g/t) in an independent NI 43-101 report filed on SEDAR+, May 7, 2025, by Questcorp. An inclined shaft bending ~70° to the west parallels the favorable horizon. Holes were drilled at an angle to the east to intersect the target as close to perpendicular as practicable and to evaluate the continuity of alteration and mineralization.
Union Norte: Two initial holes tested the manto horizon within dolomite carbonate layers to evaluate continuity and geometry along favorable trends mapped near historical workings. This phase focused on western expansion. Follow-up work, including possible excursions to the east, will be considered after analyzes and geological interpretation.
Copper and Luis: Each target was tested to assess style, structure and mineralization controls. Results to date demonstrate sulphides, mineralization types and intrusions associated with a carbonate-hosted metal system.
Figure 1: Map showing drill targets and core drill hole locations for the 12 holes of the Phase 1 program.
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Sampling and testing
The core was logged, sawn and samples of the half core were sent for analysis. Samples from the first eight holes were delivered to Bureau Veritas (Hermosillo, Sonora) for gold fire testing, with the pulp forwarded to Vancouver, Canada for inductively coupled plasma mass spectrometry (“ICP-MS”) after four-acid digestion to determine silver, base metals, and pathfinders. Samples from the final four holes were sent to ACT Labs Zacatecas where preparation, gold testing and multi-element ICP are being completed in Mexico. The remaining half-nuclei are kept for reference. The final four holes of the program were sent to ACT Labs where they were tested in the same manner using the same processing methods, but with initial preparation and analysis completed in Zacatecas, Mexico using the same ICP and goldfire testing methods.
Next steps
After the tests are received, the company plans to announce the results and begin integrating the full exploration results, including the tests, core logging, geophysics, advanced detailed multi-element geochemistry, and updated structural maps to refine the CRD model and scope for a Phase 2 exploration campaign. The Phase 2 campaign will likely include more extensive drilling and other exploration work, as this Phase 1 was only an initial sampling of some of the targets at Union. This next expanded drill program could take place in the first half of 2026 as all permits and access are in good standing and with the new data the targets will be ready to explore.
Qualified person and QA/QC:
The scientific and technical data contained in this press release relating to the project has been reviewed and approved by Freeman Smith, P.Geo, a non-independently qualified person of Riverside Resources Inc., who is responsible for ensuring the accuracy of the information contained in this press release and who acts as a “qualified person” under National Instrument 43-101 Standards of Disclosure for Mineral Projects.
About Riverside Resources Inc.:
Riverside is a well-funded exploration company driven by value generation and discovery. The company has a solid balance sheet with no debt and less than 75 million shares outstanding with a strong portfolio of gold-silver and copper assets and royalties in North America. Riverside has extensive experience and knowledge in Mexico and Canada and uses its large database to generate a portfolio of potential mineral properties. Riverside has properties available for option, with information available on the company’s website at www.rivres.com.
Qualified person and QA/QC:
The technical contents of this press release have been reviewed and approved by R. Tim Henneberry’, P.Geo (BC), director of the company and a qualified person under National Instrument 43-101.
Rock samples from previous exploration programs discussed above in the project were taken to the Bureau Veritas Laboratories in Hermosillo, Mexico for fire testing for gold. The rejects remained at Bureau Veritas in Mexico, while the pulp was transported to the Bureau Veritas laboratory in Vancouver, BC, Canada for 45-element ICP/ES-MS analysis using 4-acid digestion methods. As part of the sampling procedures for the exploration program, a QA/QC program was implemented. Standards were randomly inserted into the sample stream before being sent to the laboratory.
About Questcorp Mining Inc.
Questcorp Mining engages in the acquisition and exploration of mineral properties in North America for the purpose of locating and developing valuable economic valuable and base metals. The Company has an option to acquire a 100 percent undivided interest in and to mineral claims totaling 1,168.09 hectares, consisting of the North Island copper property, on Vancouver Island, BC, subject to a royalty obligation. The company also has an option to acquire a 100 percent undivided interest in and to mineral claims totaling 2,520.2 hectares, including the La Union project in Sonora, Mexico, subject to a royalty obligation.
ON BEHALF OF THE BOARD OF DIRECTORS,
Saf Dhillon
Chairman & CEO
Suite 550, 800 West Pender Street
Vancouver, British Columbia
V6C 2V6.
Certain statements in this press release are forward-looking statements, which reflect management’s expectations regarding the completion of exploration work at the North Island Copper project. Forward-looking statements consist of statements that are not purely historical, including statements regarding beliefs, plans, expectations or intentions regarding the future. Such statements are subject to risks and uncertainties that could cause actual results, performance or developments to differ materially from those expressed in the statements. There can be no assurance that the events anticipated in the forward-looking statements will occur or, if they do occur, what benefits the company will derive from them. Except as required by the securities disclosure laws and regulations applicable to the Company, the Company undertakes no obligation to update these forward-looking statements if management’s beliefs, estimates or opinions, or other factors, should change.
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