ATEX expands Phase VI program, B2B breccia strike grows 50%

Phase VII Program Set to Advance Multiple High-Priority Valeriano Targets Ahead of Updated Mineral Resource Estimate in 2H 2027

Advancing New Regional Exploration to Demonstrate District-Scale Opportunity

Toronto, Ontario--(Newsfile Corp. - September 16, 2026) - ATEX Resources Inc. (TSX: ATX) OTCQX: ATXRF) (" ATEX " or the " Company ") is pleased to announce interpretations and key findings from its Phase VI drill program at the Valeriano Copper-Gold Project (" Valeriano " or the " Project "), located in the Atacama Region, Chile. The Phase VII drill program is expected to commence in early Q4 2026, with further details to be provided closer to its start.

Highlights include:

Phase VI was the largest drill campaign completed by ATEX at Valeriano, totaling approximately 28,400m of drilling, exceeding the original 25,000m target and representing an increase of more than 70% over Phase V.

Phase VI delivered several of the highest-grade and most significant drill intercepts in ATEX's exploration history, highlighted by ATXD25C i with 40m of 4.83% CuEq within 86m of 3.84% CuEq, ATXD23C ii with 78m of 3.03% CuEq, ATXD26B iii with 186m of 2.15% CuEq andATXD32 iv with 56m of 2.36% CuEq, all within the high-grade B2B breccia.

B2B high grade breccia was materially expanded and the system remains open in all directions , with Phase VI drilling extending high-grade breccia mineralization by approximately 200m to the south, increasing the interpreted strike length by 50% to approximately 600m .

Exploration opportunity is growing beyond the high-grade B2B breccia ,with the broader mineralized corridor expanding approximately 200m east at the higher B2B elevation ,and an approximate 150m true-width zone of mineralized host rock identified north of B2B.

Porphyry-related mineralization established across an approximate 1.8-kil