Further Definition Of The Johnny Lee Lower Copper Zone

WHITE SULPHUR SPRINGS, MT – Sandfire Resources America Inc. reported that the 2024-2025 drilling program was completed in mid-May 2025. Drilling has focused on further definition of the Johnny Lee Lower Copper Zone. Highlights include: 1) 8.11 meters of 4.66% copper in hole SC24-311. 2) 14.99 meters of 7.99% copper in hole SC24-312. 3) 10.58 meters of 4.69% Cu in hole SC25-316. 4) 11.73 meters of 8.80% Cu in hole SC25-325. 5) 4.91 meters of 9.74% Cu in hole SC25-328.
At the last estimate, the Johnny Lee Lower Copper Zone consisted of a measured and indicated resource of 1.2 million tonnes grading 6.8% Cu, and an inferred resource of 0.5 million tonnes grading 5.9% Cu. Holes in the 2024-2025 drilling program were designed to both infill and better define the outer boundaries of the Lower Copper Zone resource and provide sample material for geotechnical and metallurgical testing. Since December 2023, the Company has drilled approximately 28,000 meters. Geological and geochemical results from the drilling program and from metallurgical and geotechnical testing will provide information for an updated mineral resource estimate for the Johnny Lee deposit, which will be incorporated into an updated technical report (in accordance with requirements pursuant to National Instrument 43-101 – Standards of Disclosure for Mineral Projects.), at the Pre-feasibility study level, for the Johnny Lee deposit (Updated Technical Report), with expected completion in late 2025.  
Senior VP of Exploration and Technical Services, Jerry Zieg, said, “We are pleased with the outcome of the drilling program which has confirmed that the mineralization of the high-grade Johnny Lee Lower Copper zone extends beyond the existing resource boundary. We look forward to incorporating this into the Updated Technical Report in the coming months.”