NCX.V · 2026-09-20 12:00:00

Northisle Announces Filing of NI 43-101 T echnical Report for the North Island Project

Resource Estimates

Northisle Copper and Gold Inc. | 520 – 1050 West Pender St. | Vancouver, BC | V6E 3S7

www.northisle.ca | [email protected]

September 20, 2026

TSXV: NCX

OTCQX: NTCPF

Northisle Announces Filing of NI 43-101 T echnical Report

for the North Island Project

Vancouver, B.C. – Northisle Copper and Gold Inc. (TSX-V: NCX, OTCQX: NTCPF) (“Northisle” or the “Company”) is

pleased to announce that the Company has filed on SEDAR+ a technical report (the “Report”) prepared in

accordance with National Instrument 43‐101 – Standards of Disclosure for Mineral Projects (“NI 43‐101”) titled “NI

43-101 Resource Estimate for the North Island Project 202 6 Update” on the Company’s 100% owned North Island

copper-gold project located in the north end of Vancouver Island, British Columbia (the “North Island Project”). The

Report was prepared by Sue Bird, M.Sc., P.Eng ., of Moose Mountain Technical Services, and Peter Mehrfert, M.Sc.,

P.Eng., of Ausenco Engineering Canada ULC, each a “Qualified Person” for purposes of NI 43-101. The effective date

of the Report is July 31, 2026.

The full Report can be found under the Company’s profile on SEDAR+ at www.sedarplus.ca. The Company’s

previous technical reports are no longer current and should not be relied upon.

About Northisle

Northisle Copper and Gold Inc. is a Vancouver -based company whose vision is to become Canada’s leading

sustainable mineral resource company for the future. Northisle, through its 100% 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, British Columbia on a more than 34,000 -hectare

block of mineral titles 100% owned by Northisle on a belt stretching 50 kilometres northwest from the now closed

Island Copper Mine operated by BHP Billiton. Since 2021, the Company has discovered two significant deposits,

expanded resources, demonstrated the potential of the North Island Project , and is now focused on the

development of this compelling project while exploring within this highly prospective land package.

Northisle respectfully acknowledges that our North Island Project is located within the territories of Quatsino First

Nation, Kwakiutl First Nation, and Tlatlasikwala First Nation. We are committed to collaborating with First Nations

to build authentic, mutually beneficial relationships.

For more information on Northisle please visit the Company’s website at www.northisle.ca.

On behalf of Northisle Copper and Gold Inc.

Nicholas Van Dyk, CFA

Chief Financial Officer

Tel: (604) 638-2515

www.northisle.ca

Neither the TSX Venture Exchange nor its Regulation Services Provider (as that term is defined in the policies of the TSX

Venture Exchange) accepts responsibility for the adequacy or accuracy of this news release.