Northisle Announces Infill Drill Results at Northwest Expo Extend Strike and Add New High-Grade Intervals .bwalignc { text-align: center; list-style-position: inside } .bwalignl { text-align: left } .bwblockalignc { margin-left: auto; margin-right: auto } .bwblockalignl { margin-left: 0px; margin-right: auto } .bwcellpmargin { margin-bottom: 0px; margin-top: 0px } .bwlistcircle { list-style-type: circle } .bwlistdisc { list-style-type: disc } .bwpadb3 { padding-bottom: 4px } .bwpadl0 { padding-left: 0px } .bwpadl3 { padding-left: 15px } .bwpadr0 { padding-right: 0px } .bwrowaltcolor1 { background-color: #d3d3d3 } .bwsinglebottom { border-bottom: solid black 1pt } .bwtablemarginb { margin-bottom: 10px } .bwvertalignb { vertical-align: bottom } .bwvertalignt { vertical-align: top } .bwwidth10 { width: 10% } .bwwidth100 { width: 100% } .bwwidth11 { width: 11% } .bwwidth12 { width: 12% } .bwwidth13 { width: 13% } .bwwidth14 { width: 14% } .bwwidth18 { width: 18% } .bwwidth7 { width: 7% } .bwwidth8 { width: 8% } High-grade interval in NW25-57 of 117.0 metres at 1.50 g/t Au Eq., including 52.5 metres at 1.91 g/t Au Eq. Highlights: Selected gold-equivalent assay intercepts include: NW25-57: 117.0 metres at 1.50 g/t Au Eq. from 231.0 metres, including 52.5 metres at 1.91 g/t Au Eq. from 256.5 metres NW25-54: 75.0 metres at 1.37 g/t Au Eq. from 246.0 metres, including 42.0 metres at 1.69 g/t Au Eq. from 279.0 metres and a higher-grade interval of 18.2 metres at 2.86 g/t Au Eq. from 333.7 metres NW25-53: 107.7 metres at 1.20 g/t Au Eq. from 254.0 metres, including 67.5 metres at 1.76 g/t Au Eq. from 254.0 metres Mineralization at Northwest Expo has now been extended to approximately 1.1km of strike length Results confirm consistent mineralization, and higher grades in Northwest Sector of pit shell Northwest Sector: significantly higher-grade mineralization discovered within resource pit shell Central Sector: high-grade mineralization from PEA resource model confirmed Southeast Sector: shallow mineralization from PEA resource model confirmed Deep Sector: lower-grade mineralization from PEA resource model confirmed PFS infill drilling campaign finalized, with 13,980 metres in total and results from Red Dog expected in Q2 2026 Northisle Copper and Gold Inc. (TSX-V: NCX, OTCQX: NTCPF) (“Northisle” or the “Company”) is pleased to announce additional drill results from its infill drilling campaign at the Northwest Expo deposit. A total of 8,464 metres were drilled at Northwest Expo with the objective of upgrading Inferred resources to the Indicated category in support of the ongoing Pre-Feasibility Study at the North Island Project (the “North Island PFS”), while improving confidence in the continuity and geometry of higher-grade mineralization at Northwest Expo and extending the strike length of the mineralized footprint. This press release features multimedia. View the full release here: https://www.businesswire.com/news/home/20260331058559/en/ Figure 1: North Island Project Showing Location of Deposits and Prospects Sam Lee, President & CEO commented “We are highly encouraged by these results at Northwest Expo, which expand our understanding of the North Island Project’s broader exploration potential. The results have increased our confidence level in the first phase of the project by identifying higher-grade, gold-rich mineralization in certain zones within the 2025 PEA pit shell. With a robust balance sheet, Northisle is uniquely positioned to simultaneously create value through project development and drive continued growth in the mineral potential of the district.” Discussion of Drill Results The 2025 infill drilling program at Northwest Expo was designed to improve confidence in the continuity and geometry of higher-grade mineralization while supporting the conversion of Inferred resources to the Indicated category. A total of 8,464 metres were drilled, with hole distribution designed to confirm the continuity of mineralization and the distribution of gold and copper grades. Results received to date demonstrate consistent mineralization over broad intervals, with locally developed higher-grade domains that contribute to the gold-rich profile of the mineralized system at Northwest Expo. The results confirm that mineralization at Northwest Expo is characterized by continuous, near-surface to moderately deep intervals of gold-rich copper mineralization, with molybdenum contributing significantly in some instances to the overall metal endowment. The current results highlight both the lateral and vertical continuity of mineralization, as well as the presence of discrete higher-grade zones within broader mineralized envelopes. Holes NW25-42, NW25-43, NW25-44, NW25-45, NW25-46, NW25-47, NW25-49 and NW25-51 were drilled in the southeastern portion of the deposit, targeting the extension of mineralization beyond the limits of historical drilling used in the current resource model. Results from this sector confirm the contin