Category: Exploration and Development

Riverside Resources and Questcorp Mining are preparing for the first-ever drill program at the Union Gold-Silver Project in Sonora, Mexico, targeting high-priority Carbonate Replacement Deposit (CRD) zones. The 1,500-meter diamond drilling will test Union, North Union, and Famosa zones, which historically produced 50,000 ounces of gold equivalent. Recent geophysical surveys, including IP and drone magnetics, along with surface geochemistry, have refined drill targets, showing significant potential for gold and base metal discoveries.

Questcorp Mining Inc. is advancing surface exploration at the La Union Gold-Silver Project in Sonora, Mexico, to prepare for a 1,500-meter maiden drill program. Operator Riverside Resources completed geophysical surveys and mapping to refine drill targets. The 2,520-ha carbonate replacement deposit shows high-grade gold, silver, and base metals, with potential for significant discoveries.

Mithril Silver and Gold Limited has defined an 8km-long, 1,200m-deep high-grade gold-silver system at its Copalquin Project in Mexico. Drilling starts this month at Target 5, with Target 3 set for late Q3 2025. New sampling extended Target 2 by 1,000m. High-grade results from Targets 2, 3, 4, and 5 highlight significant discovery potential.

Pinnacle Silver and Gold Corp. updated on June 25, 2025, its El Potrero project (Mexico): ongoing mapping/sampling (>600 samples), high-grade results (e.g., 19.4 g/t Au, 266 g/t Ag over 4.1m underground; surface grabs up to 13.2 g/t Au, 2,280 g/t Ag). Consultants assessed plant/permitting favorably; drilling planned to test vein system.

Tocvan Ventures Corp. reported RC drill results from Gran Pilar’s South Block, Sonora, Mexico, highlighting 42.7 meters of 41 g/t silver and 0.14 g/t gold in JES-25-120, including 4.6 meters of 180 g/t silver. All holes showed gold mineralization, with 21% exceeding 25 gram-meters. The results suggest a robust epithermal system, with plans for further drilling and permitting.

Heliostar Metals Ltd. reported successful drilling at the Truckshop stockpile at La Colorada Mine, Sonora, Mexico, with highlights including 10.7m at 1.81 g/t gold and 19.8m at 0.62 g/t gold. The results support the company’s strategy to maximize cash flow from low-cost stockpiles before expanding the Veta Madre and Creston pits. Next, drilling will target the El Dorado stockpile.

Questcorp Mining Inc. (CSE: QQQ) has launched the first phase of its work program at the La Union CRD project in Sonora, Mexico, targeting a 100% interest from Riverside Resources Inc. The program includes IP surveying, geological mapping, and sampling to optimize drill targets for a 1,500-meter drill program in Q3 2025, focusing on high-grade polymetallic mineralization.

President Sheinbaum explained why the open-pit mining ban proposed by former President Andrés Manuel López Obrador was withdrawn and announced she will continue the moratorium on new mining concessions. Permits for existing mines will be under environmental review, especially open-pit operations. Permits currently being granted address tailings and operational issues, not new projects.

Tocvan Ventures Corp. announced a 50,000-tonne pilot leaching facility design for its Gran Pilar Gold-Silver Project in Sonora, Mexico, spanning 1.76 hectares. The 2023 land acquisition expanded the project to 21 km². High-grade drilling results (e.g., 3.1m at 19.4 g/t Au) and 62% gold recovery from a 2023 bulk sample highlight its potential, with permitting and financing targeted for 2025.

Vizsla Silver Corp. advances its Copala test mine at the Panuco silver-gold project in Mexico, reaching 125 meters in the decline. The 10,000-tonne bulk sample will support backfill planning and resource conversion. The portal will serve as the main access for future mining, with the fully funded program on track for completion by year-end.