CORRECTION: Omineca Continues Operations Underground at Wingdam Paleoplacer Gold Project; Receives First Nations Letter of Support

CORRECTION: Omineca Continues Operations Underground at Wingdam Paleoplacer Gold Project; Receives First Nations Letter of Support A correction is being issued for the press release that was disseminated on July 15, 2026, due to an incorrect photo being inserted, “Placer Gold Recovered at #2 Heading”. Other than one photo being replaced, everything else remains the same. The complete and correct release follows:

Omineca Mining and Metals Ltd. (TSXV: OMM) (OTCQB: OMMSF) ("Omineca" or the "Company") is pleased to provide a program update for its Wingdam Underground Paleoplacer Gold Recovery Project, located in the Cariboo Mining District of south-central British Columbia. Underground crosscut development and stabilization work in crosscut #2 has resulted in the recovery of substantial quantities of placer gold from the workings. Omineca is also pleased to announce the receipt of a formal letter of support from the Lhtako Dene Nation. The Nation has confirmed this support in a letter specifically addressed to the British Columbia government.

Program Highlights Mining partner DL Mining has completed preparation of Crosscut #2 for advance across the paleochannel and through the pay gravel zone already encountering substantial quantities of placer gold (see Photos Crosscut #2 below) Awaiting BC ministry approval to continue across the channel with the current mining method which has been performing exceptionally well - grouted spiling and shotcrete arch ground support as designed by the Engineer-of-Record The Lhtako Dene Nation (Red Bluff Indian Band) has submitted a formal letter of support for the Wingdam Project to the British Columbia government Upon successful demonstration of safe paleochannel crossing, the Company intends to file its Five-Year Mine Plan for full development along the initially indicated 1.4 kilometres of paleochannel

Project Overview The Wingdam Underground Paleoplacer Gold Recovery Project is located along the Barkerville Highway, approximately 30 kilometres west of Barkerville in the Cariboo Mining District. The underground project covers more than 15 linear kilometres of placer claims along the Lightning Creek valley and sits within the central portion of Omineca's land package, which exceeds 600 square kilometres of combined hard rock and placer claims. The objective of the project is the full-scale recovery of high-grade placer gold from a paleochannel (an ancient riverbed) located approximately 50 metres beneath the active Lightning Creek. The economic potential of the project was demonstrated in 2012 when the first bulk sample from a single 2.4 metre by 2.4 metre by 24 metre crosscut recovered 173.4 ounces of placer gold.

2026 Underground Operations (see photos above) During the 2026 operating season, steady progress has continued utilizing the grouted spiling and shotcrete arch ground stabilization and tunnelling method designed by MineTech International Limited, the Engineer of Record for the Wingdam project. D&L Mining has provided all required documentation and support for continued operations at Wingdam and is awaiting approval to move forward from the BC Ministry of Mining and Critical Minerals. The ministry has become much more proactive in overseeing operations at all mining projects in British Columbia which has understandably added significant time to the reporting/ response/development cycle. Operationally the mine plan at Wingdam is performing as designed and both D&L and Omineca are very pleased with the application of the engineered ground stability program. This approach pr...