Mr. Sam Lee reports

NORTHISLE ANNOUNCES ADDITIONAL ASSAYS AT WEST GOODSPEED CONFIRM NEAR-SURFACE COPPER-GOLD PORPHYRY-STYLE MINERALIZATION WITHIN OPEN VOLUME

Additional diamond drill holes and assays from NorthIsle Copper and Gold Inc.'s West Goodspeed exploration program have confirmed the existence of near-surface porphyry-style mineralization over wide intervals.

Assays released today for GS24-07 through GS24-10, combined with previously released drill holes at West Goodspeed, have all intercepted copper and gold mineralization within a large, structurally controlled zone stretching over at least 800 metres (m) of strike length, which remains open along strike and at depth. Significant intervals from 2024 drilling at West Goodspeed are shown in an attached table. GS24-10 stands out as containing the longest intercept to date from West Goodspeed of 210 m grading 0.50 per cent copper equivalent (CuEq), starting at overburden with a subinterval of 68 m grading 0.86 per cent CuEq.

Sam Lee, president and chief executive officer, stated: "Our exploration team continues to deliver at West Goodspeed following its discovery in late 2023. Our 2024 phase 1 program has been very successful to date as all holes assayed have intercepted grades and widths anticipated to have a positive impact on our overall resource portfolio. The mineralization is near surface, open along strike and downdip, and is adjacent to the footprint of the North Island oroject as defined in our 2021 PEA, as well as the ongoing updated PEA work. The results to date support prioritizing further exploration at this compelling target as part of future programs."

West Goodspeed drill result details

Assay results have now been received for five of the eight drill holes completed during 2024 on the West Goodspeed target. These include GS24-06 (previously reported) to GS24-10. All holes were drilled from existing reactivated forest service roads.

An attached table shows the collar data for the holes drilled at West Goodspeed during 2023 and 2024.

GS24-07 was drilled from the same drill pad as GS24-06 but directed in the opposite direction targeting an area to the west, 180 metres south of discovery hole GS23-04. GS24-08 and GS24-09 were collared on the same pad 240 metres east-northeast of GS24-06/07, and were targeted to step out to the east and downdip of previous drill holes. GS24-10 was collared 200 metres northwest of GS24-04 directed in a southwesterly direction with the goal of testing the northwest extension of the target. Despite the paucity of outcrop here, field mapping has confirmed the existence of late fault sets parallel to the major mineralization bounding faults observed in core.

Additional drilling is now planned at West Goodspeed to step out along strike to the northwest and southeast, as well as searching for additional mineralization on the hangingwall and footwall of the two structurally bounding faults, and to better define the mineralized zone.

Mineralization at West Goodspeed exhibits multiple generations of Cu (copper) and gold (Au) plus or minus Ag/Re/Mo (silver-rhenium-molybdenum) mineralization. Magmatic hydrothermal breccias host multiple phases of porphyry clasts, as well as refractory quartz-chalcopyrite-pyrite vein fragments. Mineralization occurs as disseminated, remobilized chalcopyrite grains, as well as late magnetite-chalcopyrite veins and clots.

Upcoming catalysts

In 2024, the company will continue advancing the North Island project, with development and exploration catalysts throughout the year leading to measurable impacts for shareholders, including the following:

• Completed -- geophysics results from Northwest Expo and West Goodspeed;
• Completed -- Northwest Expo metallurgical testing and initial resource estimate;
• Completed -- final 2023 Pemberton Hills drill results;
• Completed -- commencement of 2024 drilling program;
• Completed -- preliminary project trade-offs;
• Completed -- commencement of advanced economic and technical studies;
• Completed -- initial drill results from West Goodspeed;
• Q3 (third quarter) 2024 -- continued exploration results from 2024 phase 1 drilling program;
• Q3 (third quarter) 2024 -- integrated North Island project mineral resource estimate update;
• Q4 (fourth quarter) 2024 -- North Island project 2024 preliminary economic assessment (PEA);
• H2 (second half) 2024 - full results from 2024 phase 1 drilling program;
• Continuing -- continued positive engagement with indigenous rightholders and local stakeholders.

Upcoming investor events

During 2024, the company will continue to be active in investor outreach. NorthIsle will be attending several external investor events, including the following events during Q3/Q4 2024:

• Summer of 2024: broker and institutional site visits;
• Sept. 10, 2024, to Sept. 13, 2024: Precious Metals Summit, Beaver Creek, Colo.;
• Sept. 15, 2024, to Sept. 18, 2024: Gold Forum Americas, Colorado Springs, Colo.;
• Nov. 20, 2024, to Nov. 21, 2024: Swiss Mining Institute, Zurich, Switzerland.

Additional technical details

Logging, sampling and assaying procedures, and QA/QC (quality assurance/quality control)

The diamond drill core logging and sampling program was carried out under a rigorous QA/QC program. Drill intersections in this news release are typically HQ to 100 m and NQ thereafter to the end of holes. After drilling, core was logged for geology, structure and geotechnical characteristics utilizing Geospark core logging software, then marked for sampling and photographed on site. The cores for analyses were marked for sampling based on geological intervals with individual samples three m or less in length. Drill core was cut lengthwise in half with a core saw. Half-core was sent for assays reported in this news release. Prior to cutting core for assay bulk density was also determined on site by taking 15- to 20-centimetre (cm) lengths of whole core of each lithology at 10 m intervals. The ends of these were then cut at right angle to the core axis, retaining all pieces to be returned to the core box for later sample cutting and analysis. The diameter of each core sampled for bulk density was measured at each end with digital calipers to three decimal places and recorded. The length of the core was measured on four sides at 90 degrees to each other, to two decimal places and recorded. The software averaged the lengths and diameters. The mass of the dry core was measured twice on an Ohaus balance to two decimal places. If no discrepancy occurred the measurement was recorded. If there was a discrepancy, the measuring was repeated until no discrepancy between two measurements occurred. The density was calculated using the formula bulk density equals pi times r squared times h (where r is radius of core and h is length of core). Certified standard masses are used to calibrate the scale balance used for bulk density determinations. The balance in the core logging area was levelled on a large concrete block to avoid vibration, and was levelled and surrounded by a wooden partition to avoid wind affecting the balance. The measurements were recorded in Geospark logging software and bulk density calculated to two decimal places.

A total of 5 per cent assay standards or blanks and 5 per cent core duplicates are included in the sample stream as a quality control measure and are reviewed after analyses are received. Standards were obtained from WCM Minerals of Vancouver, CDN Minerals of Langley and OREAS of Canada. Blanks were obtained from unmineralized coarse bagged limestone landscaping rock. Standards and blanks in 2023 drill results to date have been approved as acceptable. Duplicate data add to the long-term estimates of precision for assay data on the project and precision for drill results reported is deemed to be within acceptable levels. Samples were sent to MSALABS in Langley, B.C., where the samples were dried and then crushed and split; and a 250-gram split was pulverized to 85 per cent passing minus-200-mesh (minus-75-micrometre) size pulps. Clean crush material was passed through the crusher and clean silica was pulverized between each sample. The pulps were analyzed for gold by fire assay fusion of 50 grams of the 250-gram split. Total gold content was determined by digesting the silver dore bead from the fusion and then analyzing by AA (atomic absorption) (MSA Code FAS-121). All samples were also analyzed for multiple elements by taking 0.25 gram of the 250-gram split, which was heated in HNO3 (nitric acid), HClO4 (perchloric acid) and HF (hydrofluoric acid) to fuming and taken to dryness. The residue was dissolved in HCl (hydrochloric acid) and then analyzed utilizing ICP-MS (inductively coupled plasma-mass spectrometry) (MSA Code IMS-230). Any sulphur analysis from this latter analysis with a value greater than 10 per cent was reanalyzed utilizing a Leco sulphur analyzer. Iron and tungsten accelerators are added to the sample and a stream of oxygen is passed over the sample in the induction furnace. As the sample is heated, sulphur dioxide released from the sample is measured by an IR (infrared) detection system and the total sulphur content is determined (MSA Code SPM-210). MSALABS (Langley) is an independent, international ISO/IEC 17025:2005 accredited laboratory.

Pulps and rejects of holes with significant assay intervals are stored at Western Mineral Storage. The remaining split core is indexed and stored at NorthIsle's logging and office facility in Port Hardy, B.C.

Drill results in this news release are length weighted averages.

Qualified persons and data verification

Robin Tolbert, PGeo, vice-president exploration of NorthIsle and a qualified person as defined by National Instrument 43-101, Standards of Disclosure for Mineral Projects, has reviewed and approved the scientific and technical disclosure contained in this news release, and has verified the data disclosed, including the sampling, analytical and test data underlying the disclosure.

About NorthIsle Copper and Gold Inc.

NorthIsle is a Vancouver-based company, the mission of which is to become Canada's leading sustainable mineral resource company for the future. NorthIsle, through its 100-per-cent-owned subsidiary, North Island Mining Corp., owns the North Island project, which is one of the most promising copper and gold porphyry projects in Canada. The North Island project is located near Port Hardy, B.C., on a more-than-34,000-hectare block of mineral titles 100 per cent owned by NorthIsle, stretching 50 kilometres northwest from the now closed Island copper mine operated by BHP Billiton. NorthIsle completed an updated preliminary economic assessment for the North Island project in 2021 and is now focused on continued advancement of the project while exploring within this highly prospective land package.

We seek Safe Harbor.