Grande Portage Resources posts Amalga permitting schedules on FAST-41

Vancouver, British Columbia--(Newsfile Corp. - September 29, 2026) - Grande Portage Resources Ltd. (TSXV: GPG) (OTCQX: GPTRF) (FSE: GPB) ("Grande Portage" or the "Company") is pleased to announce that the official permitting timetable for its New Amalga Gold Project in Southeast Alaska has been posted to the Federal Permitting Improvement Steering Council's (FPISC) Federal Permitting Dashboard, in line with New Amalga's status as a "Covered Project" under the FAST-41 federal permitting program.

The publication of the project's federal permitting schedule represents an important milestone in the regulatory process for New Amalga. The schedule provides a publicly accessible framework for tracking anticipated permitting milestones, agency responsibilities and progress toward completion of the environmental review and permitting process.

Ian Klassen, the Company's President & CEO, commented, "We are pleased to see the New Amalga Gold Project's federal permitting timetable formally established and posted to the FAST-41 Dashboard. This represents an important step forward in advancing the project through the federal permitting process. This binding timetable resulted from extensive coordination between the Permitting Council, the U.S. Forest Service, the U.S. Army Corps of Engineers and other participating agencies. Having a publicly accessible permitting schedule ensures transparency, coordination and accountability as we move forward through the various regulatory requirements for New Amalga. We greatly appreciate the work of the Permitting Council and the various agencies who contributed to this coordination effort."

The New Amalga Gold Project was accepted into the FAST-41 program on July 30, 2026, becoming a Covered Project under the program. The U.S. Forest Service serves as the lead federal permitting agency, with other federal agencies participating in the review and authorization process. The project's FAST-41 designation provides a framework for coordinated federal agency reviews and a publicly available permitting timetable, allowing interested viewers to monitor progress and any changes to anticipated milestones.

Under FAST-41, federal agencies are required to adhere to the completion dates established in the project's permitting timetable. Agencies that miss, or anticipate missing, a milestone must provide a written explanation and establish an alternative completion date, with ongoing progress reports required for delayed actions. The Permitting Improvement Steering Council also provides congressional oversight through quarterly reports evaluating agency compliance with FAST-41 requirements.

The Company's FAST-41 permitting timetable can be accessed through the Federal Permitting Dashboard at: https://www.permits.performance.gov/permitting-project/fast-41-covered-projects/new-amalga-gold-project/ .

The New Amalga Gold Project is a proposed small-footprint underground gold mine located approximately 20 miles north of Juneau, Alaska, within the Tongass National Forest. The project currently hosts an NI 43-101 mineral resource of 1,438,500 ounces of indicated gold and 515,700 ounces of inferred gold. Its development concept contemplates direct shipment of ore for offsite processing, eliminating the need for an onsite processing plant and tailings storage facility.

Kyle Mehalek, P.E.., is the QP within the meaning of NI 43-101 and has reviewed and approved the technical disclosure in this release. Mr. Mehalek is independent of Grande Portage within the meaning of NI 43-101.

About Grande Portage:

Grande Portage Resources Ltd. is a publicly traded mineral exploration company focused on advancing the New Amalga Mine project, the outgrowth of the Herbert Gold discovery situated approximately 25 km north of Juneau, Alaska. The Company holds a 100% interest in the New Amalga property. The New Amalga gold system is open to length and depth and is host to at least six main composite vein-fault structures that contain ribbon structure quartz-sulfide veins. The project lies prominently within the 160km long Juneau Gold Belt, which has produced over eight million ounces of gold.

The Company's updated NI#43-101 Mineral Resource Estimate (MRE) reported at a base case mineral resources cut-off grade of 2.5 grams per tonne gold (g/t Au) and consists of: an Indicated Resource of 1,438,500 ounces of gold at an average grade of 9.47 g/t Au (4,726,000 tonnes); and an Inferred Resource of 515,700 ounces of gold at an average grade of 8.85 g/t Au (1,813,000 tonnes), as well as an Indicated Resource of 891,600 ounces of silver at an average grade of 5.86 g/t Ag (4,726,000 tonnes); and an Inferred Resource of 390,600 ounces of silver at an average grade of 7.33 g/t silver (1,813,000 tonnes). The MRE was prepared by Dr. David R. Webb, Ph.D., P.Geol., P.Eng. (DRW Geological Consultants Ltd.) with an effective date of July 17, 2024. Additional information on the New Amalga Mine project is available in the technical report titled "Preliminary Economic Assessment for the New Amalga Gold Project Juneau District, Southeast Alaska" dated February 11, 2026, which is available under Grande Portage's SEDAR+ profile at www.sedarplus.ca .

ON BEHALF OF THE BOARD "Ian Klassen" Ian M. Klassen President & Chief Executive Officer Tel: (604) 899-0106 Email: Ian@grandeportage.com

Cautionary Statement Regarding Forward-Looking Information

This news release includes certain "forward-looking statements" under applicable Canadian securities legislation. Forward-looking statements include estimates and statements that describe the Company's future plans, objectives or goals, including words to the effect that the Company or management expects a stated condition or result to occur. Forward-looking statements may be identified by such terms as "believes", "anticipates", "expects", "estimates", "may", "could", "would", "will", or "plan". Forward-looking statements or information contained in this release include, but are not limited to, statements or information with respect to: the commercial offtake, equity investment and construction loan and overrun facility from Ocean Partners, including terms, timing, benefits and synergies and use of proceeds thereof; Ocean Partners' future share holdings; and advancement of the Project, including the proposed path to production timeline, economics and timing of the Environmental Impact Statement. Since forward-looking statements are based on assumptions and address future events and conditions, by their very nature they involve inherent risks and uncertainties, These assumptions, risks, uncertainties and other factors include, among others: ability to finalize definitive agreements relating to the commercial offtake, equity investment and construction loan and overrun facility, complete the transactions contemplated herein, and to obtain all necessary approvals; risks associated with the exploration and development of the New Amalga Mine and our mineral resources; including obtaining all necessary approvals and the timing thereof; the current or future price of gold, silver and other commodities; anticipated costs, expenses and working capital requirements; ability to meet the proposed production timeline for the Project; general business and economic conditions and political climate; and other assumptions, risks, uncertainties and other factors as described in the Company's filings with Canadian securities regulators. There can be no assurance that such statements will prove to be accurate, as actual results and future events could differ materially from those anticipated in such statements. Accordingly, readers should not place undue reliance on forward-looking statements. The Company disclaims any intention or obligation to update or revise any forward-looking information, whether as a result of new information, future events or otherwise, other than as required by law.

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TMX Newsfile

September 29, 2026 - 1:00 AM PDT

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