Excelsior Mining Corp. announced assay results at the Johnson Camp Mine (JCM) from the Stage 1 drilling with Nuton LLC (Nuton), a Rio Tinto venture. The program consists of drilling approximately 6,000 feet of PQ core, primarily for the purposes of further metallurgical evaluation.

The samples from the drill program will be processed for mineralogy and tested using the NutonTM process. The program is being funded by Nuton and carried out by Excelsior in connection with the previously announced Option to JV Agreement. All 13 planned holes have been drilled using diamond drill rigs to generate PQ sized core and assays have been returned for all holes.

The Stage 1 program is divided into two phases. Phase 2 holes (designated PH2) were drilled above the mineralization from the east side of the Burro pit. These holes were designed to test the extent of the mineralization and provide further representative metallurgical samples.

Stage 1, Phase 1 drilling results were previously announced on September 14, 2023. All samples are prepared from manually split or sawn PQ core sections on site in Arizona. Split drill core samples are then sent to independent laboratory Skyline Assayers & Laboratories in Tucson, Arizona for Total Copper and Sequential Copper analyses.

Standards, blanks, and duplicate assays are included at regular intervals in each sample batch submitted from the field as part of an ongoing Quality Assurance/Quality Control Program.