Northisle Copper and Gold Inc. announced that drilling at West Goodspeed totalling over 3,077m has intercepted porphyry-related copper mineralization over an 800-metre strike length at West Goodspeed. Assays have been received from the first completed 2024 hole (GS24-06) which intercepted porphyry-related copper and gold mineralization over approximately 200 metres, starting 9m below surface, with significant intervals shown in Table 1. Porphyry-related alteration with chalcopyrite as described further below has been visually observed in all drill holes completed during 2024 at the West Goodspeed target, with a systematic program of pXRF scanning of core to confirm the presence of copper mineralization. Readers are cautioned that exploration results at West Goodspeed are preliminary and that visual and pXRF results provide no certainty that a deposit with reasonable prospects of economic extraction will be identified.

Copper and gold equivalent calculations based on the following metal prices which were used in the Company?s 2024 Resource Estimate for Northwest Expo: Cu = US3.50/lb, Au = US1,800/oz. Calculations assume 100% recovery; totals may not add due to rounding. Intervals were selected based on continuous intercepts with a copper grade above 0.1% Cu or a gold grade above 0.1g/t Au.

Copper equivalent is determined by calculating total contained metal value/tonne, dividing by the copper price, and then dividing the resultant number of pounds of copper by 2204.6. Gold equivalent is determined by calculating total contained metal value/tonne, dividing by the gold price, and then multiplying the resultant number of troy ounces of gold by 31.103. Analyzed metal equivalent calculations are reported for illustrative purposes only and assume 100% recoveries as metallurgical testing has not yet been completed on material from the West Goodspeed target. A total of 7 drill holes totalling over 3,077m have now been completed in 2024 at West Goodspeed, with additional drilling ongoing.

This program was initially designed with approximately 3,600m planned to vector towards the source intrusion, with the goal of intercepting the potentially higher grade potassic zone commonly found in similar porphyry systems. To date, all holes drilled in the West Goodspeed area have intersected visually observed copper mineralization as chalcopyrite-pyrite disseminated and in quartz and quartz-magnetite vein stockwork within quartz-sericite-pyrite and chlorite-magnetite alteration of Bonanza Formation volcaniclastics, and feldspar porphyry and quartz diorite intrusive rocks. The mineralization and alteration is consistent with that commonly found proximal to or within the potassic zone of a porphyry system. Porphyry-style mineralization has now been estimated to extend over a strike length of 800m, a dip length of approximately 300m, and true width of 50 to 150m with the volume remaining open along strike and up and down dip.

The success of drilling to date has resulted in additional meterage being allocated to this target with the goal of further testing the extent of mineralization and to gain a better understanding of structural controls. Based on the positive initial results at West Goodspeed, Northisle has expanded the Phase 1 program in this area with the goal of defining the lateral extent of the mineralization of this zone. In addition, the Company will be staging drill pad construction crews and a second drill to site in the second half of July in order to commence drilling at the Northwest Expo target.

Utilizing reactivated forest service roads, Northisle is continuing drilling to determine the extent of mineralization at West Goodspeed first encountered in 2023 in GS23-04 and GS23-05. The subsequent drill holes through GS24-12 have all encountered porphyry style copper mineralization related to quartz-sericite-pyrite (QSP) altered zones in diorite and feldspar porphyry intrusions, with copper mineralization occurring as disseminated and in stockwork quartz and quartz magnetite veinlets.