Northisle Expands 2025 Drilling Programme to 27,000 Metres, Initiates Pre-Feasibility Work

• Drilling programme expanded from 7,000m to 27,000m for 2025, with 11,915m completed across 35 holes as of September 30, including approximately 8,000m of exploration drilling
• C$39.5 million financing completed in August 2025 to fund accelerated field programme and pre-feasibility study work
• Environmental baseline studies commenced in Q4 2025 with Falkirk Environmental Consultants, SLR Consulting Limited, and Lorax Environmental Services
• First phase stream sediment programme completed with 79 heavy mineral concentrate samples, 74 silt samples, and 9 moss mat samples collected
• Site infrastructure and team expanded, with plans to deploy up to four drill rigs by year end and 15,000m of additional drilling planned

Northisle Copper and Gold Inc. (TSX-V: NCX) is a Vancouver-based company that owns the North Island Project through its wholly owned subsidiary, North Island Mining Corp. The project covers over 34,000 hectares along a 50-kilometre belt near Port Hardy, British Columbia, extending northwest from the former Island Copper Mine.

Since 2021, the company has discovered two deposits, expanded resources, and completed a preliminary economic assessment. The company is now focused on advancing the North Island Project towards a pre-feasibility study while conducting exploration across the property.

Expanded 2025 Drilling Programme from 7,000m to 27,000m

Northisle increased its original Phase IV drilling plan from 7,000m to over 27,000m following the completion of its C$39.5 million financing in August 2025. As of September 30, the company completed 11,915 metres across 35 drill holes. The programme includes exploration drilling at West Goodspeed and Cougar targets, infill drilling at Northwest Expo and Red Dog deposits to upgrade Inferred resources to Indicated category, and geotechnical drilling for pre-feasibility engineering.

At West Goodspeed, 21 holes were completed with results from 10 holes released in July and September. The drilling tested continuity of mineralisation and evaluated extensions toward the Red Dog area. At the Cougar target, located approximately one kilometre east of Northwest Expo, three holes were completed to evaluate a magnetic anomaly coincident with hydrothermal alteration. Visual observations confirmed the presence of copper sulphides and alteration assemblages consistent with those observed elsewhere along the mineralised belt.

The company completed four infill holes at Red Dog and five at Northwest Expo to upgrade resources from Inferred to Indicated category as part of pre-feasibility planning. One step-out hole was drilled at Northwest Expo approximately 250 metres east of the main system to test a magnetic anomaly. At Goodspeed, one exploration hole tested a magnetic anomaly near outcropping copper mineralisation but did not return significant mineralised intervals. The company plans to deploy up to four drill rigs by year end, with approximately 15,000 metres of infill, geotechnical, and condemnation drilling remaining in 2025. Final Phase IV results from West Goodspeed and Northwest Expo are being assayed.

Environmental Baseline and Geotechnical Studies for Pre-Feasibility Study

Northisle contracted Falkirk Environmental Consultants, SLR Consulting Limited, and Lorax Environmental Services to conduct a multi-year environmental baseline study at the project in Q4 2025. The programme builds on environmental, socio-economic, and archaeological data collected since 2021. The 2025 baseline work includes aquatics, terrestrial, hydrogeological, and geochemical data collection.

Environmental baseline studies document existing environmental conditions of air, water, soil, and biotic resources in an area prior to project construction. These studies establish a baseline for assessing potential project impacts and are required for mine permitting processes. The work supports the company's preparation for environmental assessment requirements.

Geotechnical studies have been initiated in areas designated for key project infrastructure, including field mapping, surface geophysics, test pits, diamond and sonic drilling, with completion planned by year end. Pre-feasibility level metallurgical testing is scheduled to commence in late Q4 2025, with completion targeted for Q2 2026. The company completed a conceptual review with BC Hydro for interconnection and plans to initiate a System Impact Study in Q4 2025. Major engineering scopes for the pre-feasibility study are expected to be awarded in Q4 2025.

District-Scale Exploration and 3D Geological Modelling Progress

The first phase of the district-wide stream sediment sampling programme has been completed, with 79 heavy mineral concentrate samples, 74 silt samples, and 9 moss mat samples collected. Results are being integrated into exploration models to refine target definition across the 50-kilometre porphyry belt. The results show high copper concentrations in proximity to main deposits and known targets, and have identified prospective areas to the east of the property. A second phase stream sediment programme will commence in the coming weeks, focusing on tracing the strongest anomalies identified in Phase I.

The company is developing a 3D geological model of the North Island porphyry belt in collaboration with Mira Geoscience Ltd. An initial model of the Jurassic plutons has been constructed to delineate the spatial distribution of intrusive bodies associated with porphyry centres. This work forms the foundation of a belt-scale framework to support exploration targeting.

The next phase will focus on finalising structural interpretation by integrating regional mapping with regional and local airborne magnetic surveys. This integration will refine the model by incorporating significant geological units at the belt scale. The company plans to release a belt-wide development plan for the North Island Project by Q4 2025 and a district-scale exploration plan by early Q1 2026.

Near-Term Milestones

The company has outlined the following milestones: final results from Phase IV drilling at West Goodspeed and Northwest Expo in Q4 2025, completion of metallurgical testing in Q2 2026, and an integrated resource update for the North Island Project in Q2 2026. The pre-feasibility study is targeted for completion by Q4 2026. The company continues engagement with indigenous rightsholders and local stakeholders, and plans additional team additions to support project advancement.

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