Omineca Mining and Metals Issues Corrected Press Release with Program Update and Lhtako Dene Nation Support

Saskatoon, Saskatchewan — July 17, 2026 — Leads & Copy — Omineca Mining and Metals Ltd. is correcting a press release initially issued on July 15, 2026, due to an incorrect photo being included. The photo, titled “Placer Gold Recovered at #2 Heading,” has been replaced. All other information in the release remains unchanged.

The company provided an update on its Wingdam Underground Paleoplacer Gold Recovery Project, located in British Columbia's Cariboo Mining District. Significant quantities of placer gold have been recovered from underground workings following development and stabilization efforts in crosscut #2.

Omineca also announced it has received a formal letter of support from the Lhtako Dene Nation, which has been communicated to the British Columbia government.

Key highlights from the program include the preparation of Crosscut #2 by mining partner DL Mining, which is advancing across the paleochannel and through a pay gravel zone where substantial placer gold has been encountered. The company is awaiting approval from the BC ministry to continue across the channel using its current mining method, which involves grouted spiling and shotcrete arch ground support, as designed by the Engineer-of-Record. The Lhtako Dene Nation has submitted a formal letter of support for the Wingdam Project to the BC government. Omineca plans to file its Five-Year Mine Plan for full development along the initially identified 1.4 kilometers of paleochannel upon successful demonstration of a safe paleochannel crossing.

The Wingdam Underground Paleoplacer Gold Recovery Project is situated along the Barkerville Highway, approximately 30 kilometers west of Barkerville. The underground project encompasses over 15 linear kilometers of placer claims in the Lightning Creek valley, forming part of Omineca's extensive land holdings exceeding 600 square kilometers of combined hard rock and placer claims. The project's objective is the full-scale recovery of high-grade placer gold from a paleochannel, an ancient riverbed located about 50 meters beneath the active Lightning Creek. The project's economic potential was previously indicated in 2012 when a bulk sample from a single crosscut yielded 173.4 ounces of placer gold.

During the 2026 operating season, progress has been made using the grouted spiling and shotcrete arch ground stabilization and tunnelling method developed by MineTech International Limited, the project's Engineer of Record. D&L Mining has submitted all necessary documentation to the BC Ministry of Mining and Critical Minerals for continued operations. The ministry's increased oversight has reportedly extended the development cycle.

Operationally, the mine plan is performing as designed, with both D&L Mining and Omineca expressing satisfaction with the engineered ground stability program. This approach provides systematic ground support necessary for safe advancement through the complex, water-bearing ground conditions under the Lightning Creek valley. Work temporarily shifted to crosscut #2 due to high spring freshet water inflow near crosscut #3A. Work in the latter area is expected to resume later. D&L Mining has optimized performance by switching from a cementitious grout to an epoxy-based chemical grout, which offers faster setup times and effectiveness across varying ground conditions and is immune to water infiltration.

Upon demonstrating the capability to safely tunnel and recover placer gold across the paleochannel from multiple locations, Omineca intends to submit its Five-Year Mine Plan to provincial authorities. This plan is designed for scaled development along the approximately 1.4 kilometers of paleochannel.

Omineca has expressed appreciation to Chief Clifford Lebrun and the Lhtako Dene Nation for their formal letter of support, highlighting a positive and long-standing relationship. The company is committed to responsible resource development and creating benefits for the Lhtako Dene Nation and the Cariboo region.

All scientific and technical information in this news release was prepared or approved by Stephen Kocsis, P.Geo., an independent qualified person under National Instrument 43-101. Omineca's flagship Wingdam project includes mineral tenures totaling 61,392 hectares and over 15 linear kilometers of placer claims along the Lightning Creek valley, which contains preserved layers of gold-bearing gravels in a buried paleochannel. The company is also exploring for potential hard rock sources of this placer gold.

Source: Omineca Mining and Metals Ltd.