Questcorp & Riverside Launch Maiden Drill Program at La Union Gold-Silver Project in Mexico

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08/06/2025 – 03:15 AM

Vancouver, British Columbia–(Newsfile Corp. – August 6, 2025) – Questcorp Mining Inc. (CSE: QQQ) (OTCQB: QQCMF) (FSE: D910) (the “Company” or “Questcorp”) is betting big on gold – and they’re drilling down to prove it. The junior miner announced today the commencement of its highly anticipated maiden drilling program at the La Union Project in northwest Sonora, Mexico. Riverside Resources Inc. (TSXV: RRI), the property’s vendor and operator, is spearheading the on-site operation.

Key Takeaways for Investors:

• Aggressive Exploration: The initial program aims to significantly expand known mineralization zones across the 25 km² area, probing new targets and legacy mine workings.
• Significant Investment: Questcorp is putting its money where its ambitions are. The program involves approximately 1,500m of diamond core drilling, averaging 250m per hole.
• Targeting CRD Systems: Drilling will focus on carbonate-hosted replacement deposit (CRD) mineralization, seeking that “golden goose” – gold deposits associated with mantos, chimneys, and structural zones within this geological hotbed.
• Strategic Angles: The angled drill holes are designed to intersect stratigraphic and structural targets perpendicularly, a standard practice in CRD system exploration for maximum data yield.

Riverside’s recent, three-month deep dive into the region’s structural geology and stratigraphy is feeding directly into the drill targets. The La Union district, perched on the Sierra El Viejo mountain range, is now benefiting from these updated interpretations, guiding current exploration efforts. The ultimate goal? Nothing short of a major gold discovery, expanding well beyond the historical smaller-scale mining operations that previously graced the property.

Saf Dhillon, President & CEO of Questcorp, expressed palpable excitement. “Questcorp is thrilled to partner with John-Mark and the Riverside team in this pivotal moment for La Union. The project boasts decades of preliminary work, including the extraction of 50,000 ounces of gold. Now, for the first time ever, we’re putting drill to ground!”

Earlier this year, Questcorp inked a definitive option agreement with Riverside’s subsidiary, RRM Exploracion, securing the right to acquire 100% interest in La Union. As part of the deal, Riverside received shares in Questcorp, creating a powerful synergy. With Questcorp’s initial C$1,000,000 exploration program now active, the company is kicking off the first stage of a more ambitious C$5,500,000 commitment, contingent on exploration breakthroughs.

Drill Program Deep Dive: More than four distinct areas are in the crosshairs, kicking off with a stratigraphic and exploratory phase. The objective: Gauge the extent of alteration and uncover the telltale signs of a robust mineralized system. Despite a history of localized mining activity, many of these targets will undergo their first-ever drilling.

Following this initial phase (one to three holes per area, primarily for orientation), Questcorp plans to ramp up operations based upon initial results, which will help verify the all-important stratigraphy, lithologies, and structural features. This influx of data will allow for refined modeling, and ultimately, accelerate strategic targeting and discovery.

The Lay of the Land: Target Areas

• Union Main Mine Area: Angled drill holes will dissect limestone and other carbonate-rich stratigraphic hosts within the Clemente Formation, pushing towards the underlying Caborca Formation. These formations are prime real estate for replacement-style mineralization.
• North Union Mine Area: The initial program will prioritize structural interpretation, testing existing models and potentially leading to follow-up drilling to assess areas bearing past mining activity.
• Cobre Mine Area: The Clemente Formation dominates here, with a combination of structural features intersecting with historical mining zones creating a wealth of potential. Drilling will begin to reveal the thickness of the host rock before extending into the highly prospective Caborca Formation.
• Central Union Area: In this area with a history of manto-style mining, structural targets – potential feeders for mineralization – stand front and center. Extensive additional targets warrant the initial orientation drilling to aid ongoing studies of the Clemente Formation, and possibly even the Caborca Formation.

Strategic Context for La Union:

The project is detailed in Questcorp’s recently published NI 43-101 Technical Report, readily available on SEDAR+. Riverside, with foresight, originally consolidated key mineral claims, building a solid ownership position. Riverside then negotiated surface access agreements and secured vital drill permits – transforming La Union into an immediate-action exploration opportunity for Questcorp.

The roots of the project trace back to Riverside’s extensive exploration within western Sonora’s celebrated Gold Belt, in collaboration with industry giants like AngloGold Ashanti Limited, Centerra Gold Inc., and Hochschild Mining Plc. Pioneering work by Riverside’s founder, John-Mark Staude, built upon decades of geological compilation and analysis, further solidifying the region’s potential.

At the La Union, historical Penoles Mining Company zeroed in on chimney and manto-style replacement bodies within the superficial oxide zones. Therefore, the untouched sulfide zones deeper down are high-priority drill targets for today’s exploration efforts.

La Union’s geology is notable. The project boasts favorable limestone host rocks, broad zones of alteration, and diverse pre-existing workings. Critically, there are mineralization patterns remarkably similar to those observed at the Hermosa Project in southern Arizona, where South32 is aggressively developing its mine, having acquired the project from Arizona Mining. On February 15, 2024, South32 greenlit a massive US$2.16 billion capital investment to develop the Taylor zinc-lead-silver deposit, marking the largest private mining investment in Southern Arizona’s history. This project is now established as one of the most significant undeveloped base-metal assets in the entire United States.

La Union’s drill targets offer the potential for significant new insights. The project is well-positioned for near-term exploration success. The targets include both shallow oxide mineralization and deeper sulfide mineralization.

Figure 1. Geologic map with the tenure of the Union internal concession shown in pink. Manto and chimney type CRD targets are shown as red polygons. All mineral tenures on this map comprise the La Union project. The drill program will focus on the Union Mine and areas north of the Union Mine with the initial drill work.

To view an enhanced version of this graphic, please visit:
https://images.newsfilecorp.com/files/10197/261433_a2ed3d4fb471dade_001full.jpg

Figure 2. Cross section looking west with conceptual drill targets and schematic drillhole traces. Assays from Riverside’s sampling of rock dump materials from the two mine areas are labeled in black. Red areas are interpreted as manto and chimney target bodies that are now well defined and drill ready. Assays shown on figures 1 and 2 have been previously released and disclosed as summarized below the geochemical QA/QC and in published NI 43-101 Report that Questcorp published 2025 on Sedar+.

To view an enhanced version of this graphic, please visit:
https://images.newsfilecorp.com/files/10197/261433_a2ed3d4fb471dade_002full.jpg

Geological Overview of La Union:

The La Union Project embodies a carbonate replacement deposit (“CRD”), embedded in sedimentary rocks (limestones, dolomites, and siliciclastic sediments). It sits atop crystalline Paleoproterozoic rocks of the Caborca Terrane. The structural geography is characterized by high-angle normal faults and low-to-medium-angle thrust faults, some of which acted as conduits for mineralization. The ore itself manifests as polymetallic veins, replacement zones (mantos, chimneys), along with shear zones demonstrating striking metal content. Sample highlights include grades around 59.4 grams per metric tonne (g/t) gold, 833 g/t silver, 11% zinc, 5.5% lead, and 2.2% copper, concurrent with significant hematite and manganese oxides, consistent with a CRD model (see the technical report entitled “NI 43-101 Technical Report on the Union Project, State of Sonora, Mexico”). Current exploration hopes hinge on the potential for sizable gold finds, lying above a larger porphyry Cu district. This ambitious hypothesis drives Questcorp forward.

Important Caveat Emptor: While historical sampling has yielded eye-popping results, Questcorp urges investors to remember that grab samples are inherently selective and may not accurately represent the extent of mineralization across the entire property.

Qualified Person Statement: The information underlying this announcement has been technically audited by R. Tim Henneberry, P. Geo (BC), a director of Questcorp considered a “qualified person” within the bounds of National Instrument 43-101.

About Questcorp Mining Inc.:

Questcorp Mining Inc. is dedicated to acquiring and exploring promising mineral properties throughout North America. Their key objectives include identifying and developing economically viable precious and base metal deposits. Currently, Questcorp holds an option to acquire 100% interest in claims totaling 1,168.09 hectares across the North Island Copper Property on Vancouver Island, as well as the aforementioned La Union Project covering 2,520.2 hectares in Sonora, Mexico. Both properties are subject to royalty obligations.

Contact Information:

Questcorp Mining Corp.
Saf Dhillon, President & CEO

Disclaimer: This news release includes “forward-looking statements” subject to significant risks, assumptions, and uncertainties. Actual results may differ materially from the current outlook. The company assumes no obligation to revise these statements, excluding as required by law.

To view the source version of this press release, please visit https://www.newsfilecorp.com/release/261433